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Artykuły w czasopismach na temat „Cosmic microwave background radiation (CMB)”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Pommerenke, Gerd. "About Cosmic Microwave Background Radiation (CMBR)." Annals of Computational Physics and Material Science 1, no. 2 (2024): 01–42. http://dx.doi.org/10.33140/acpms.01.02.03.

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Because the CMBR follows the PLANCK's radiation law more or less exactly, it should, because of the indistinguishability of individual photons, apply to a whatever black emitter. Therefrom arises the guess, that the existence of an upper cut- off frequency of the vacuum could be the cause for the decrease in the upper frequency range. Since the lower-frequent share of the curve correlates with the frequency response of an oscillating circuit with the Qfactor ½, it is examined, whether it succeeds to approximate the Planck curve by multi-plication of the initial curve with the dynamic, time- de

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2

Smoot, G. F. "Of Cosmic Background Anisotropies." Symposium - International Astronomical Union 168 (1996): 31–44. http://dx.doi.org/10.1017/s007418090010991x.

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Observations of the Cosmic Microwave Background (CMB) Radiation have put the standard model of cosmology, the Big Bang, on firm footing and provide tests of various ideas of large scale structure formation. CMB observations now let us test the role of gravity and General Relativity in cosmology including the geometry, topology, and dynamics of the Universe. Foreground galactic emissions, dust thermal emission and emission from energetic electrons, provide a serious limit to observations. Nevertheless, observations may determine if the evolution of the Universe can be understood from fundamenta

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3

BERSHADSKII, A. "SCALING PROPERTIES OF THE COSMIC BACKGROUND PLASMA AND RADIATION." International Journal of Modern Physics D 12, no. 03 (2003): 509–17. http://dx.doi.org/10.1142/s0218271803003219.

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Scaling properties of the cosmic microwave background (CMB) radiation are studied using satellite (COBE-DMR maps), balloon-borne and ground-based (combined QMASK map) data. Quantitative consistency is found between the multiscaling properties of the COBE-DMR and QMASK CMB maps. Surprisingly, it is found that the observed CMB temperature multiscaling quantitatively resembles the multiscaling properties of fluid turbulence, that indicates primordial plasma turbulence as an origin of the CMB temperature space anisotropy.

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4

Svishch, V. M. "The Features of the Reference Frame Concomitant to the Cosmic Microwave Background." European Journal of Applied Physics 3, no. 6 (2021): 1–6. http://dx.doi.org/10.24018/ejphysics.2021.3.6.115.

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The features of reference frame, concomitant to the cosmic microwave background, immobile relatively cosmic microwave background, are considered. It is shown that the features of reference frame, concomitant to the cosmic microwave background (CMB), are determined by its properties. Any other object in the Universe and reference frame concomitant to it, is immersed in the CMB and moves relative to the reference frame concomitant to microwave background radiation. The zero pecular velocity of the reference frame concomitant to the microwave background radiation is analogous to the zero temperat

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5

Smoot, George F. "Antarctic observations of the cosmic microwave background." Highlights of Astronomy 9 (1992): 589. http://dx.doi.org/10.1017/s1539299600022607.

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In the standard cosmology of the Big Bang theory the cosmic microwave background (CMB) is the remnant radiation from the hot early universe. The sky signal is comprised of radiation from the CMB, from Galactic emission, from atmospheric emission, and from instrument sidelobes seeing the ground and man-made interference. One observes in directions of minimum galactic signal. The antarctic polar plateau provides the best site in the world for low atmospheric emission, low horizons, low man-made interference, and reasonable accessibility. The low column density of precipitable water and extreme s

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6

Ota, Atsuhisa. "Fluctuation-dissipation relation in cosmic microwave background." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 062. http://dx.doi.org/10.1088/1475-7516/2024/05/062.

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Abstract We study the fluctuation-dissipation relation for sound waves in the cosmic microwave background (CMB), employing effective field theory (EFT) for fluctuating hydrodynamics. Treating sound waves as the linear response to thermal radiation, we establish the fluctuation-dissipation relation within a cosmological framework. While dissipation is elucidated in established linear cosmological perturbation theory, the standard Boltzmann theory overlooks the associated noise, possibly contributing to inconsistencies in Lambda Cold Dark Matter (ΛCDM) cosmology. This paper employs EFT for fluct

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7

Hofmann, Ralf, and Janning Meinert. "Frequency–Redshift Relation of the Cosmic Microwave Background." Astronomy 2, no. 4 (2023): 286–99. http://dx.doi.org/10.3390/astronomy2040019.

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We point out that a modified temperature–redshift relation (T-z relation) of the cosmic microwave background (CMB) cannot be deduced by any observational method that appeals to an a priori thermalisation to the CMB temperature T of the excited states in a probe environment of independently determined redshift z. For example, this applies to quasar-light absorption by a damped Lyman-alpha system due to atomic as well as ionic fine-splitting transitions or molecular rotational bands. Similarly, the thermal Sunyaev-Zel’dovich (thSZ) effect cannot be used to extract the CMB’s T-z relation. This is

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8

WINSTEIN, B. "CMB POLARIZATION: THE NEXT DECADE." International Journal of Modern Physics D 16, no. 12b (2007): 2563–71. http://dx.doi.org/10.1142/s0218271807011796.

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I review the exciting science that awaits cosmologists in precision measurements of the cosmic microwave background radiation, particularly its polarization. The conclusions of the Interagency Taskforce ("Weiss Panel") will also be presented. I conclude with an update based primarily on the new WMAP results from their three-year analysis.

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9

S., Subramanian. "Complete Solution to the Hubble tension from Cosmic Microwave Background Radiation Temperature." Journal of Emerging Technologies and Innovative Research 11, no. 9 (2024): d160—d167. https://doi.org/10.5281/zenodo.14161961.

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   This paper presents a complete solution to the current issue of Hubble tension that arises between Planck 2018 team and SHOES team. Herein we introduce a new constant named as "Dark Constant." Dark Constant is the ratio of X-Energy with the energy of Cosmic Microwave Background Radiation. While estimating X-Energy, we also show the relationship between X-Energy and Hubble's constant (Ho). In the same way we show relationship between Hubble's constant (Ho) and Cosmic Microwave Background Temperature (T). There by we derive a solution to the Hubble tension/issue, estimate the value

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10

Sakamoto, Hina, Kyungjin Ahn, Kiyotomo Ichiki, Hyunjin Moon, and Kenji Hasegawa. "Probing the Early History of Cosmic Reionization by Future Cosmic Microwave Background Experiments." Astrophysical Journal 930, no. 2 (2022): 140. http://dx.doi.org/10.3847/1538-4357/ac6668.

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Abstract Cosmic reionization imprints its signature on the temperature and polarization anisotropies of the cosmic microwave background (CMB). Advances in CMB telescopes have already placed a significant constraint on the history of reionization. As near-future CMB telescopes target the maximum sensitivity, or observations limited only by the cosmic variance (CV), we hereby forecast the potential of future CMB observations in constraining the history of reionization. In this study, we perform Markov Chain Monte Carlo analysis for CV-limited E-mode polarization observations such as the Lite (Li

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11

Traunmüller, Hartmut. "Does standard cosmology really predict the cosmic microwave background?" F1000Research 9 (February 19, 2021): 261. http://dx.doi.org/10.12688/f1000research.22432.5.

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In standard Big Bang cosmology, the universe expanded from a very dense, hot and opaque initial state. The light that was last scattered about 380,000 years later, when the universe had become transparent, has been redshifted and is now seen as thermal radiation with a temperature of 2.7 K, the cosmic microwave background (CMB). However, since light escapes faster than matter can move, it is prudent to ask how we, made of matter from this very source, can still see the light. In order for this to be possible, the light must take a return path of the right length. A curved return path is possib

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12

Traunmüller, Hartmut. "Does standard cosmology really predict the cosmic microwave background?" F1000Research 9 (September 23, 2021): 261. http://dx.doi.org/10.12688/f1000research.22432.6.

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In standard Big Bang cosmology, the universe expanded from a very dense, hot and opaque initial state. The light that was last scattered about 380,000 years later, when the universe had become transparent, has been redshifted and is now seen as thermal radiation with a temperature of 2.7 K, the cosmic microwave background (CMB). However, since light escapes faster than matter can move, it is prudent to ask how we, made of matter from this very source, can still see the light. In order for this to be possible, the light must take a return path of the right length. A curved return path is possib

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13

Traunmüller, Hartmut. "Does standard cosmology really predict the cosmic microwave background?" F1000Research 9 (September 28, 2020): 261. http://dx.doi.org/10.12688/f1000research.22432.4.

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In standard Big Bang cosmology, the universe expanded from a very dense, hot and opaque initial state. The light that was last scattered about 380,000 years later, when the universe had become transparent, has been redshifted and is now seen as thermal radiation with a temperature of 2.7 K, the cosmic microwave background (CMB). However, since light escapes faster than matter can move, it is prudent to ask how we, made of matter from this very source, can still see the light. In order for this to be possible, the light must take a return path of the right length. A curved return path is possib

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14

Yan, Ye-Peng, Guo-Jian Wang, Si-Yu Li, and Jun-Qing Xia. "Recovering Cosmic Microwave Background Polarization Signals with Machine Learning." Astrophysical Journal 947, no. 1 (2023): 29. http://dx.doi.org/10.3847/1538-4357/acbfb4.

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Abstract Primordial B-mode detection is one of the main goals of current and future cosmic microwave background (CMB) experiments. However, the weak B-mode signal is overshadowed by several Galactic polarized emissions, such as thermal dust emission and synchrotron radiation. Subtracting foreground components from CMB observations is one of the key challenges in searching for the primordial B-mode signal. Here, we construct a deep convolutional neural network (CNN) model, called CMBFSCNN (Cosmic Microwave Background Foreground Subtraction with CNN), which can cleanly remove various foreground

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15

Biswas, Anirban, Dilip Kumar Ghosh, and Dibyendu Nanda. "Concealing Dirac neutrinos from cosmic microwave background." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (2022): 006. http://dx.doi.org/10.1088/1475-7516/2022/10/006.

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Abstract The existence of prolonged radiation domination prior to the Big Bang Nucleosynthesis (BBN), starting just after the inflationary epoch, is not yet established unanimously. If instead, the universe undergoes a non-standard cosmological phase, it will alter the Hubble expansion rate significantly and may also generate substantial entropy through non-adiabatic evolution. This leads to a thumping impact on the properties of relic species decoupled from the thermal bath before the revival of the standard radiation domination in the vicinity of the BBN. In this work, considering the Dirac

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16

GANGUI, ALEJANDRO. "EARLY UNIVERSE SOURCES FOR CMB NON-GAUSSIANITY." International Journal of Modern Physics A 17, no. 29 (2002): 4273–80. http://dx.doi.org/10.1142/s0217751x02013319.

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In the framework of inflationary models with non-vacuum initial states for cosmological perturbations, we study non-Gaussian signatures on the cosmic microwave background (CMB) radiation produced by a broken-scale-invariant model which incorporates a feature at a privileged scale in the primordial power spectrum.

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17

Steigman, Gary. "Neutrinos and Big Bang Nucleosynthesis." Advances in High Energy Physics 2012 (2012): 1–24. http://dx.doi.org/10.1155/2012/268321.

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According to the standard models of particle physics and cosmology, there should be a background of cosmic neutrinos in the present Universe, similar to the cosmic microwave photon background. The weakness of the weak interactions renders this neutrino background undetectable with current technology. The cosmic neutrino background can, however, be probed indirectly through its cosmological effects on big bang nucleosynthesis (BBN) and the cosmic microwave background (CMB) radiation. In this BBN review, focused on neutrinos and more generally on dark radiation, the BBN constraints on the number

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18

Komala, Muhammad Khaidir, Akhmad Aminuddin Bama, and Supardi. "Analyzing Earth's Position based on the Anisotropic Characteristics of Cosmic Microwave Background Radiation." Jurnal Pendidikan Fisika dan Teknologi 9, no. 2 (2023): 343–55. http://dx.doi.org/10.29303/jpft.v9i2.6284.

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This paper elaborates on the results of an exhaustive study regarding the Earth's position in the universe based on the Cosmic Microwave Background (CMB) radiation map, which is the latest discovery in modern astronomy. CMB radiation provides crucial insights into the early distribution of mass and energy in the universe. The aim of this research is to understand the theory and mechanisms behind the formation of polarity structures in the CMB and analyze their correlation with Earth's position in the overall structure of the universe. Intensity measurement data of CMB radiation published by CO

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19

MIRZOYAN, S., and E. POGHOSIAN. "EXPLORING THE COSMIC MICROWAVE BACKGROUND AS A COMPOSITION OF SIGNALS WITH KOLMOGOROV ANALYSIS." Modern Physics Letters A 24, no. 38 (2009): 3091–101. http://dx.doi.org/10.1142/s021773230903206x.

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The problem of separation of different signals in the Cosmic Microwave Background (CMB) radiation using the difference in their statistics is analyzed. Considering samples of sequences which model the CMB as a superposition of signals, we show how the Kolmogorov stochasticity parameter acts as a relevant descriptor, either qualitatively or quantitatively, to distinguish the statistical properties of the cosmological and secondary signals.

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20

Traunmüller, Hartmut. "Does standard cosmology really predict the cosmic microwave background?" F1000Research 9 (April 16, 2020): 261. http://dx.doi.org/10.12688/f1000research.22432.1.

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In standard Big Bang cosmology, the universe expanded from a very dense, hot and opaque initial state. The light that was last scattered about 380,000 years later, when the universe had become transparent, has been redshifted and is now seen as thermal radiation with a temperature of 2.7 K, the cosmic microwave background (CMB). However, since light escapes faster than matter can move, it is prudent to ask how we, made of matter from this very source, can still see the light. In order for this to be possible, the light must take a return path of the right length. A curved return path is possib

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21

Traunmüller, Hartmut. "Does standard cosmology really predict the cosmic microwave background?" F1000Research 9 (June 3, 2020): 261. http://dx.doi.org/10.12688/f1000research.22432.2.

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In standard Big Bang cosmology, the universe expanded from a very dense, hot and opaque initial state. The light that was last scattered about 380,000 years later, when the universe had become transparent, has been redshifted and is now seen as thermal radiation with a temperature of 2.7 K, the cosmic microwave background (CMB). However, since light escapes faster than matter can move, it is prudent to ask how we, made of matter from this very source, can still see the light. In order for this to be possible, the light must take a return path of the right length. A curved return path is possib

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22

Traunmüller, Hartmut. "Does standard cosmology really predict the cosmic microwave background?" F1000Research 9 (July 7, 2020): 261. http://dx.doi.org/10.12688/f1000research.22432.3.

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In standard Big Bang cosmology, the universe expanded from a very dense, hot and opaque initial state. The light that was last scattered about 380,000 years later, when the universe had become transparent, has been redshifted and is now seen as thermal radiation with a temperature of 2.7 K, the cosmic microwave background (CMB). However, since light escapes faster than matter can move, it is prudent to ask how we, made of matter from this very source, can still see the light. In order for this to be possible, the light must take a return path of the right length. A curved return path is possib

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23

Smoot, G. F. "Cosmology with the CMB." International Journal of Modern Physics D 06, no. 04 (1997): 377–91. http://dx.doi.org/10.1142/s0218271897000224.

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The cosmic microwave background (CMB) radiation provides a means to test the standard model of cosmology and determine its parameters with precision. Cosmology has made a great step forward with the observations and discoveries of the COBE satellite. These were followed with a series of observations and progress via ballon-borne and ground-based instrumentation. Now NASA and ESA have selected and approved new space missions: MAP and COBRAS/SAMBA (now named Planck) which may nearly reach the full potential of CMB observations.

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24

Puget, J. L., N. Aghanim, R. Gispert, F. R. Bouchet, and E. Hivon. "Planning Future Space Measurements of the CMB." Symposium - International Astronomical Union 168 (1996): 447–52. http://dx.doi.org/10.1017/s0074180900110344.

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A central problem in cosmology is the building and testing of a full and detailed theory for the formation of (large-scale) structures in the Universe. It is widely believed that the observed structures today grew by gravitational instability out of very small density perturbations. Such perturbations should have left imprints as small temperature anisotropies in the cosmic microwave background (CMB) radiation.

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25

Researcher. "DETECTING THE IMPRINT OF PRIMORDIAL GRAVITATIONAL WAVES ON THE COSMIC MICROWAVE BACKGROUND POLARIZATION PATTERNS USING NEXT-GENERATION OBSERVATORIES." International Journal of Astronomy and Astrophysics (IJAA) 3, no. 1 (2025): 1–5. https://doi.org/10.5281/zenodo.14698472.

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The detection of primordial gravitational waves (PGWs) is a pivotal goal in modern cosmology, providing direct evidence for inflationary theory. Their faint imprints on the polarization patterns of the Cosmic Microwave Background (CMB) radiation, specifically in the B-mode polarization, hold the key. Next-generation observatories such as CMB-S4 and LiteBIRD promise unprecedented sensitivity to these signals. This paper discusses theoretical and observational progress, reviews recent advancements, and explores methodologies for analyzing PGW imprints on CMB polarization patterns.

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26

Choudhury, Tirthankar Roy, Suvodip Mukherjee, and Sourabh Paul. "Cosmic microwave background constraints on a physical model of reionization." Monthly Notices of the Royal Astronomical Society: Letters 501, no. 1 (2020): L7—L11. http://dx.doi.org/10.1093/mnrasl/slaa185.

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ABSTRACT We study constraints on allowed reionization histories by comparing predictions of a physical seminumerical model with secondary temperature and polarization anisotropies of the cosmic microwave background (CMB). Our model has four free parameters characterizing the evolution of ionizing efficiency ζ and the minimum mass Mmin of haloes that can produce ionizing radiation. Comparing the model predictions with the presently available data of the optical depth τ and kinematic Sunyaev–Zeldovich signal, we find that we can already rule out a significant region of the parameter space. We li

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27

WIBIG, TADEUSZ, and ARNOLD W. WOLFENDALE. "COSMIC RAYS AND COSMOLOGY." International Journal of Modern Physics A 20, no. 29 (2005): 6612–20. http://dx.doi.org/10.1142/s0217751x05029642.

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Two aspects of cosmic rays and cosmology are considered here. Firstly, the relevance of extragalactic cosmic rays to the radiation – and magnetic – fields in the Universe and secondly the contribution of Galactic cosmic rays (or other entities allied to them) to the 'foreground' in analysis of the cosmic microwave background (CMB). Concerning the latter, we present evidence strongly suggesting that the foreground is, indeed, important. Coupled with the demonstration of asymmetries, of Galactic form, in the CMB maps the case for changes to the presently-derived cosmological parameters is strong

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Ulianov MSc, PhD, Dr Policarpo Yoshin. "The CAT solution: resolving the hubble constant puzzle." Physics & Astronomy International Journal 9, no. 1 (2025): 1–6. https://doi.org/10.15406/paij.2025.09.00357.

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This study presents a groundbreaking reevaluation of the Cosmic Microwave Background’s (CMB) genesis through the lens of Cosmic Antiproton Tomography (CAT) Radiation, challenging traditional Big Bang cosmology. We propose that the CMB originated not 380,000 years post-Big bang but within the universe’s initial milliseconds, marked by the annihilation of proton-antiproton pairs. This hypothesis not only offers a novel explanation for the CMB’s origin but also introduces the concept of Cosmic FM Background (CFMB) Radiation—resulting from electron-positron annihilation with a significantly lower

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Di Valentino, Eleonora, Leandros Perivolaropoulos та Jackson Levi Said. "Special Issue on Modified Gravity Approaches to the Tensions of ΛCDM: Goals and Highlights". Universe 10, № 4 (2024): 184. http://dx.doi.org/10.3390/universe10040184.

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The standard cosmological model, known as ΛCDM, has been remarkably successful in providing a coherent and predictive framework for understanding the Universe’s evolution, its large-scale structure, and cosmic microwave background (CMB) radiation [...]

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GURZADYAN, V. G., and A. A. KOCHARYAN. "A NEW VIEW ON THE PROBLEM OF ANISOTROPY OF THE COSMIC BACKGROUND RADIATION." International Journal of Modern Physics D 02, no. 01 (1993): 97–104. http://dx.doi.org/10.1142/s0218271893000088.

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The anisotropy properties of the Cosmic Microwave Background Radiation (CMB) are considered within the framework of the photon beam mixing effect developed earlier. The existence of an observable characteristic of the CMB is shown, namely the geometrical shape of anisotropy spots and their degree of complexity, which can contain unique information on cosmological parameters and the life history of the Universe. If future experiments (COBE and others) indicate such features of anisotropy maps, then one can have serious evidence for the negative curvature of the Universe.

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Lee, Jeffrey S., and Gerald B. Cleaver. "Ultra-relativistic thermodynamics and aberrations of the cosmic microwave background radiation." Modern Physics Letters A 30, no. 09 (2015): 1550045. http://dx.doi.org/10.1142/s0217732315500455.

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Ultra-relativistic inertial and non-inertial reference frames would be subjected to a forward-directed heat bath from the Lorentz transformed temperature of the Cosmic Microwave Background (CMB) radiation. Although the Lorentz transformations of heat and temperature continue to be unresolved issues in the literature,1–6 this paper makes use of occupation number (number density of occupied states per phase space element) to support a Lorentz factor inflation of the rest frame temperature. Additionally, Doppler Boosting is examined.

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POGOSIAN, LEVON. "COSMIC DEFECTS AND CMB ANISOTROPY." International Journal of Modern Physics A 16, supp01c (2001): 1043–45. http://dx.doi.org/10.1142/s0217751x01008849.

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Recent measurements of the cosmic microwave background (CMB) anisotropies by BOOMERANG and MAXIMA collaborations have tightened the observational constraints on theories of structure formation. They disagree with the predictions of conventional topological defect models. Considering the fact that topological defects are predicted by the majority of realistic particle physics models, the exact nature of the constraints imposed by the recent data on the population and the properties of the defects must be fully understood. We show that the predictions of current cosmic string models can be broug

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Vlahovic, Branislav, Maxim Eingorn, and Cosmin Ilie. "Uniformity of cosmic microwave background as a non-inflationary geometrical effect." Modern Physics Letters A 30, no. 35 (2015): 1530026. http://dx.doi.org/10.1142/s0217732315300268.

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The conventional [Formula: see text]CDM cosmological model supplemented by the inflation concept describes the Universe very well. However, there are still a few concerns: new Planck data impose constraints on the shape of the inflaton potential, which exclude a lot of inflationary models; dark matter is not detected directly, and dark energy is not understood theoretically on a satisfactory level. In this brief sketch, we investigate an alternative cosmological model with spherical spatial geometry and an additional perfect fluid with the constant parameter [Formula: see text] in the linear e

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Vielzeuf, P., A. Kovács, U. Demirbozan, et al. "Dark Energy Survey Year 1 results: the lensing imprint of cosmic voids on the cosmic microwave background." Monthly Notices of the Royal Astronomical Society 500, no. 1 (2020): 464–80. http://dx.doi.org/10.1093/mnras/staa3231.

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ABSTRACT Cosmic voids gravitationally lens the cosmic microwave background (CMB) radiation, resulting in a distinct imprint on degree scales. We use the simulated CMB lensing convergence map from the Marenostrum Institut de Ciencias de l’Espai (MICE) N-body simulation to calibrate our detection strategy for a given void definition and galaxy tracer density. We then identify cosmic voids in Dark Energy Survey (DES) Year 1 data and stack the Planck 2015 lensing convergence map on their locations, probing the consistency of simulated and observed void lensing signals. When fixing the shape of the

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SINGAL, JACK. "THE CMB AND GALACTIC MICROWAVE ABSOLUTE SPECTRUM: SCIENCE AND MEASUREMENT WITH ARCADE 2." Modern Physics Letters A 23, no. 21 (2008): 1719–33. http://dx.doi.org/10.1142/s0217732308027485.

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Beyond spatial anisotropy and polarization, a third type of structure in the Cosmic Microwave Background radiation, that of deviations in the overall absolute intensity versus frequency spectrum from a blackbody form, encodes additional important cosmological and astrophysical information, and remains inconclusively studied. This article discusses the ARCADE 2 project, the current balloon-based experimental effort to measure the absolute radiometric temperature of the CMB and Galactic microwave emission in the range from 3 to 90 GHz.

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Pearson, T. J., B. S. Mason, S. Padin, et al. "The Cosmic Background Imager." Symposium - International Astronomical Union 201 (2005): 23–32. http://dx.doi.org/10.1017/s0074180900216069.

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The Cosmic Background Imager (CBI) is an instrument designed to make images of the cosmic microwave background radiation and to measure its statistical properties on angular scales from about 3 arc minutes to one degree (spherical harmonic scales from l ˜ 4250 down to l ˜ 400). The CBI is a 13-element interferometer mounted on a 6 meter platform operating in ten 1-GHz frequency bands from 26 GHz to 36 GHz. The instantaneous field of view of the instrument is 45 arcmin (FWHM) and its resolution ranges from 3 to 10 arcmin; larger fields can be imaged by mosaicing. At this frequency and resolutio

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PAL, BARUN KUMAR, SUPRATIK PAL, and B. BASU. "A SEMI-ANALYTICAL APPROACH TO PERTURBATIONS IN MUTATED HILLTOP INFLATION." International Journal of Modern Physics D 21, no. 02 (2012): 1250017. http://dx.doi.org/10.1142/s0218271812500174.

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We study cosmological perturbations and observational aspects for mutated hilltop model of inflation. Employing mostly analytical treatment, we evaluate observable parameters during inflation as well as post-inflationary perturbations. This further leads to exploring observational aspects related to cosmic microwave background (CMB) radiation. This semi-analytical treatment reduces complications related to numerical computation to some extent for studying the different phenomena related to CMB angular power spectrum for mutated hilltop inflation.

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Li, Yunyang, Adam D. Hincks, Stefania Amodeo, et al. "Constraining Cosmic Microwave Background Temperature Evolution With Sunyaev–Zel’Dovich Galaxy Clusters from the Atacama Cosmology Telescope." Astrophysical Journal 922, no. 2 (2021): 136. http://dx.doi.org/10.3847/1538-4357/ac26b6.

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Abstract The Sunyaev–Zel’dovich (SZ) effect introduces a specific distortion of the blackbody spectrum of the cosmic microwave background (CMB) radiation when it scatters off hot gas in clusters of galaxies. The frequency dependence of the distortion is only independent of the cluster redshift when the evolution of the CMB radiation is adiabatic. Using 370 clusters within the redshift range 0.07 ≲ z ≲ 1.4 from the largest SZ-selected cluster sample to date from the Atacama Cosmology Telescope, we provide new constraints on the deviation of CMB temperature evolution from the standard model α =

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Prevenslik, Thomas V. "ISM spectrum by cosmic dust?" Proceedings of the International Astronomical Union 4, S251 (2008): 263–64. http://dx.doi.org/10.1017/s1743921308021716.

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AbstractThe interstellar medium (ISM) spectrum is usually explained by the response of dust particles (DPs) to the absorption of ultraviolet (UV) and visible (VIS) photons from nearby stars. With regard to the unidentified infrared (UIR) bands, the DPs are thought heated by UV and VIS photons to about 100 K thereby exciting the polycyclic aromatic hydrocarbons (PAHs). However, the UIR bands may be explained with the DPs at 2.7 K. To wit, the UIR bands form by the direct excitation of PAHs by infrared (IR) radiation induced from the absorption of cosmic microwave background (CMB) radiation in D

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Kumar Yadav, Sarvesh, and Rajib Saha. "Investigating non-Gaussianity in Cosmic Microwave Background temperature maps using spherical harmonic phases." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (2022): 001. http://dx.doi.org/10.1088/1475-7516/2022/01/001.

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Abstract In the era of precision cosmology, accurate estimation of cosmological parameters is based upon the implicit assumption of the Gaussian nature of Cosmic Microwave Background (CMB) radiation. Therefore, an important scientific question to ask is whether the observed CMB map is consistent with Gaussian prediction. In this work, we extend previous studies based on CMB spherical harmonic phases (SHP) to examine the validity of the hypothesis that the temperature field of the CMB is consistent with a Gaussian random field (GRF). The null hypothesis is that the corresponding CMB SHP are ind

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GURZADYAN, V. G., J. P. BOCQUET, A. KASHIN, et al. "PROBING THE LIGHT SPEED ANISOTROPY WITH RESPECT TO THE COSMIC MICROWAVE BACKGROUND RADIATION DIPOLE." Modern Physics Letters A 20, no. 01 (2005): 19–28. http://dx.doi.org/10.1142/s0217732305016294.

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We have studied the angular fluctuations in the speed of light with respect to the apex of the dipole of Cosmic Microwave Background (CMB) radiation using the experimental data obtained with GRAAL facility, located at the European Synchrotron Radiation Facility (ESRF) in Grenoble. The measurements were based on the stability of the Compton edge of laser photons scattered on the 6 GeV monochromatic electron beam. The results enable one to obtain a conservative constraint on the anisotropy in the light speed variations Δc(θ)/c<3×10-12, i.e. with higher precision than from previous experiments

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Burdyuzha, V. V., A. N. Chekmesov, V. N. Lukash, and S. I. Yakovlenko. "The Spectrum Distortion of Relic Radiation in the Moment of Universe Recombination." Symposium - International Astronomical Union 139 (1990): 404–5. http://dx.doi.org/10.1017/s0074180900241119.

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Matsumoto et al. (1988) have reported a significant distortion in the spectrum of microwave background radiation in the submillimetre waveband 400-700 μ. This follows a rocket experiment by a team from Nagoya and Berkeley in February, 1987. This experiment has resulted in a series of papers which have attempted to interpret this excess (see Carr, 1988). This result may force us to revise the process of universe recombination and/or to resort to nonequilibrium processes. The distortion of the cosmic microwave background radiation (CMB) from Planck spectrum may necessarily arise because of the p

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de la Fuente, Luisa, Beatriz Aja, Enrique Villa, and Eduardo Artal. "Calibration of a Polarimetric Microwave Radiometer Using a Double Directional Coupler." Remote Sensing 13, no. 11 (2021): 2109. http://dx.doi.org/10.3390/rs13112109.

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This paper presents a built-in calibration procedure of a 10-to-20 GHz polarimeter aimed at measuring the I, Q, U Stokes parameters of cosmic microwave background (CMB) radiation. A full-band square waveguide double directional coupler, mounted in the antenna-feed system, is used to inject differently polarized reference waves. A brief description of the polarimetric microwave radiometer and the system calibration injector is also reported. A fully polarimetric calibration is also possible using the designed double directional coupler, although the presented calibration method in this paper is

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XU, LIXIN, and JIANBO LU. "COSMIC CONSTRAINTS ON DECELERATION PARAMETER WITH Sne Ia AND CMB." Modern Physics Letters A 24, no. 05 (2009): 369–76. http://dx.doi.org/10.1142/s0217732309027212.

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In this paper, a parametrized deceleration parameter q(a) = q0+q1(1-a) is constrained by using the current cosmic observational data from type Ia Supernova (Sne Ia) and Cosmic Microwave Background Radiation (CMB). When the CMB dataset is added as a strong constraint, it is found that the 1σ error is largely reduced. The values of transition redshift zT from decelerated expansion to accelerated expansion and current deceleration parameter q0 are larger than that obtained from the case where Sne Ia dataset is used alone. With comparison to the case of Sne Ia 182 dataset used,15 it is found that

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Paiella, A., A. Coppolecchia, P. de Bernardis, et al. "Total power horn-coupled 150 GHz LEKID array for space applications." Journal of Cosmology and Astroparticle Physics 2022, no. 06 (2022): 009. http://dx.doi.org/10.1088/1475-7516/2022/06/009.

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Abstract We have developed two arrays of lumped element kinetic inductance detectors working in the D-band, and optimised for the low radiative background conditions of a satellite mission aiming at precision measurements of the Cosmic Microwave Background (CMB) radiation. The first detector array is sensitive to the total power of the incoming radiation to which is coupled via single-mode waveguides and corrugated feed-horns, while the second is sensitive to the polarisation of the radiation thanks to orthomode transducers. Here, we focus on the total power detector array, which is suitable,

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Fedosin, Sergey G. "Cosmic Red Shift, Microwave Background, and New Particles." Galilean Electrodynamics 23, SI 1 (2012): 3–13. https://doi.org/10.5281/zenodo.890806.

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The explanation of the red shift in spectra of remote galaxies and cosmic microwave background radiation from the concept of an expanding Universe seems inadequate, and invites other explanations. The present paper studies the idea of cosmic red shift and microwave background radiation as a consequence of interaction between photons and previously unknown particles. It shows that the overall mass of the new particles in the Universe has the same order of magnitude as the mass of all the nucleons. Thus the problem of invisible dark matter may be solved. The question must be raised about the nee

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Pranav, Pratyush, Robert J. Adler, Thomas Buchert, et al. "Unexpected topology of the temperature fluctuations in the cosmic microwave background." Astronomy & Astrophysics 627 (July 2019): A163. http://dx.doi.org/10.1051/0004-6361/201834916.

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We study the topology generated by the temperature fluctuations of the cosmic microwave background (CMB) radiation, as quantified by the number of components and holes, formally given by the Betti numbers, in the growing excursion sets. We compare CMB maps observed by the Planck satellite with a thousand simulated maps generated according to the ΛCDM paradigm with Gaussian distributed fluctuations. The comparison is multi-scale, being performed on a sequence of degraded maps with mean pixel separation ranging from 0.05 to 7.33°. The survey of the CMB over 𝕊2 is incomplete due to obfuscation ef

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Trinchera, Alessandro. "CMB as thermal radiation from cosmic dust grains in equilibrium with the redshifted starlight." Journal of Physics: Conference Series 2197, no. 1 (2022): 012026. http://dx.doi.org/10.1088/1742-6596/2197/1/012026.

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Abstract This paper suggests that the cosmic microwave background radiation (CMB) arises from thermalized cosmic dust grains both in the interstellar medium (ISM) and in the intergalactic medium (IGM) in electron density zones equal to 0.5 el/m3. Otherwise, the thermalization is characterized by higher temperatures in the observed range 15-27 K. Considering that a black body spectrum requires an absorber/re-emitter to take place, starting from the radiative transfer equation, the calculation method applied determines the diameter of the targets in equilibrium with the redshifted starlight nece

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Arya, Richa, and Raghavan Rangarajan. "Study of warm inflationary models and their parameter estimation from CMB." International Journal of Modern Physics D 29, no. 08 (2020): 2050055. http://dx.doi.org/10.1142/s0218271820500558.

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Warm inflation is a natural and well-motivated description of cosmic inflation which accounts for the inflaton dissipation and radiation production during the inflationary phase, neglected in the standard cold description. It results in crucial differences in the imprints on the Cosmic Microwave Background (CMB) radiation from the standard cold description. In this study, we consider warm inflation models with [Formula: see text] and [Formula: see text] potentials and estimate their model parameters consistent with CMB using the CosmoMC numerical code. These models are characterized by the inf

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BROADBRIDGE, PHILIP, RAVINDI NANAYAKKARA, and ANDRIY OLENKO. "ON MULTIFRACTIONALITY OF SPHERICAL RANDOM FIELDS WITH COSMOLOGICAL APPLICATIONS." ANZIAM Journal 64, no. 2 (2022): 90–118. http://dx.doi.org/10.1017/s1446181122000104.

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AbstractThis paper investigates spatial data on the unit sphere. Traditionally, isotropic Gaussian random fields are considered as the underlying mathematical model of the cosmic microwave background (CMB) data. We discuss the generalized multifractional Brownian motion and its pointwise Hölder exponent on the sphere. The multifractional approach is used to investigate the CMB data from the Planck mission. These data consist of CMB radiation measurements at narrow angles of the sky sphere. The results obtained suggest that the estimated Hölder exponents for different CMB regions do change from

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