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Journal articles on the topic 'Beyond-ΛCDM'

Author: Grafiati

Published: 30 November 2024

Last updated: 31 July 2025

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1

Bhattacharya, Suman, Katrin Heitmann, Martin White, Zarija Lukić, Christian Wagner та Salman Habib. "MASS FUNCTION PREDICTIONS BEYOND ΛCDM". Astrophysical Journal 732, № 2 (2011): 122. http://dx.doi.org/10.1088/0004-637x/732/2/122.

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Das, Sudeep, Roland de Putter, Eric V. Linder та Reiko Nakajima. "Weak lensing cosmology beyond ΛCDM". Journal of Cosmology and Astroparticle Physics 2012, № 11 (2012): 011. http://dx.doi.org/10.1088/1475-7516/2012/11/011.

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3

Rizzo, Luca A., Francisco Villaescusa-Navarro, Pierluigi Monaco та ін. "Simulating cosmologies beyond ΛCDM with PINOCCHIO". Journal of Cosmology and Astroparticle Physics 2017, № 01 (2017): 008. http://dx.doi.org/10.1088/1475-7516/2017/01/008.

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Tröster, Tilman, Marika Asgari, Chris Blake та ін. "KiDS-1000 Cosmology: Constraints beyond flat ΛCDM". Astronomy & Astrophysics 649 (травень 2021): A88. http://dx.doi.org/10.1051/0004-6361/202039805.

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We present constraints on extensions to the standard cosmological model of a spatially flat Universe governed by general relativity, a cosmological constant (Λ), and cold dark matter (CDM) by varying the spatial curvature ΩK, the sum of the neutrino masses ∑mν, the dark energy equation of state parameter w, and the Hu-Sawicki f(R) gravity fR0 parameter. With the combined 3 × 2 pt measurements of cosmic shear from the Kilo-Degree Survey (KiDS-1000), galaxy clustering from the Baryon Oscillation Spectroscopic Survey (BOSS), and galaxy-galaxy lensing from the overlap between KiDS-1000, BOSS, and

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5

Giblin, Benjamin, Matteo Cataneo, Ben Moews, and Catherine Heymans. "On the road to per cent accuracy – II. Calibration of the non-linear matter power spectrum for arbitrary cosmologies." Monthly Notices of the Royal Astronomical Society 490, no. 4 (2019): 4826–40. http://dx.doi.org/10.1093/mnras/stz2659.

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ABSTRACT We introduce an emulator approach to predict the non-linear matter power spectrum for broad classes of beyond-ΛCDM cosmologies, using only a suite of ΛCDM N-body simulations. By including a range of suitably modified initial conditions in the simulations, and rescaling the resulting emulator predictions with analytical ‘halo model reactions’, accurate non-linear matter power spectra for general extensions to the standard ΛCDM model can be calculated. We optimize the emulator design by substituting the simulation suite with non-linear predictions from the standard halofit tool. We revi

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6

Sakr, Z. "A trium test on beyond ΛCDM triggering parameters". Journal of Cosmology and Astroparticle Physics 2023, № 08 (2023): 080. http://dx.doi.org/10.1088/1475-7516/2023/08/080.

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Abstract We performed a Bayesian study on three beyond ΛCDM phenomenological triggering parameters, the growth index γ, the dark energy equation of state parameter ω and the lensing deviation from the GR prediction parameter Σ, using the latest cosmological geometric, growth and lensing probes, all in a consistent implementation within the modified gravity cosmological solver code MGCLASS. We find, when we combined all our probes, i.e. the cosmic microwave background (CMB), the baryonic acoustic oscilation (BAO), the growth measurements fσ 8 and the 3×2pt joint analysis of weak lensing and gal

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Li, En-Kun, Hongchao Zhang, Minghui Du, Zhi-Huan Zhou та Lixin Xu. "Probing the Neutrino Mass Hierarchy beyond ΛCDM Model". Journal of Cosmology and Astroparticle Physics 2018, № 08 (2018): 042. http://dx.doi.org/10.1088/1475-7516/2018/08/042.

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8

Bull, Philip, Yashar Akrami, Julian Adamek та ін. "Beyond ΛCDM: Problems, solutions, and the road ahead". Physics of the Dark Universe 12 (червень 2016): 56–99. http://dx.doi.org/10.1016/j.dark.2016.02.001.

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Villa, Eleonora, Enea Di Dio та Francesca Lepori. "Lensing convergence in galaxy clustering in ΛCDM and beyond". Journal of Cosmology and Astroparticle Physics 2018, № 04 (2018): 033. http://dx.doi.org/10.1088/1475-7516/2018/04/033.

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10

L’Huillier, Benjamin, Arman Shafieloo, Eric V. Linder, and Alex G. Kim. "Model independent expansion history from supernovae: Cosmology versus systematics." Monthly Notices of the Royal Astronomical Society 485, no. 2 (2019): 2783–90. http://dx.doi.org/10.1093/mnras/stz589.

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Abstract We examine the Pantheon supernovae distance data compilation in a model independent analysis to test the validity of cosmic history reconstructions beyond the concordance ΛCDM cosmology. Strong deviations are allowed by the data at z ≳ 1 in the reconstructed Hubble parameter, Om diagnostic, and dark energy equation of state. We explore three interpretations: 1) possibility of the true cosmology being far from ΛCDM, 2) supernovae property evolution, and 3) survey selection effects. The strong (and theoretically problematic) deviations at z ≳ 1 vanish and good consistency with ΛCDM is f

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Paoletti, Daniela, Dhiraj Kumar Hazra, Fabio Finelli та George F. Smoot. "Extended reionization in models beyond ΛCDM with Planck 2018 data". Journal of Cosmology and Astroparticle Physics 2020, № 09 (2020): 005. http://dx.doi.org/10.1088/1475-7516/2020/09/005.

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12

Enqvist, Kari, Till Sawala та Tomo Takahashi. "Structure formation with two periods of inflation: beyond PLaIn ΛCDM". Journal of Cosmology and Astroparticle Physics 2020, № 10 (2020): 053. http://dx.doi.org/10.1088/1475-7516/2020/10/053.

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13

Doux, C., E. Baxter, P. Lemos, et al. "Dark energy survey internal consistency tests of the joint cosmological probes analysis with posterior predictive distributions." Monthly Notices of the Royal Astronomical Society 503, no. 2 (2021): 2688–705. http://dx.doi.org/10.1093/mnras/stab526.

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ABSTRACT Beyond ΛCDM, physics or systematic errors may cause subsets of a cosmological data set to appear inconsistent when analysed assuming ΛCDM. We present an application of internal consistency tests to measurements from the Dark Energy Survey Year 1 (DES Y1) joint probes analysis. Our analysis relies on computing the posterior predictive distribution (PPD) for these data under the assumption of ΛCDM. We find that the DES Y1 data have an acceptable goodness of fit to ΛCDM, with a probability of finding a worse fit by random chance of p = 0.046. Using numerical PPD tests, supplemented by gr

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14

Sun, Chen, Manuel A. Buen-Abad, and JiJi Fan. "Probing New physics with high-redshift quasars: axions and non-standard cosmology." Journal of Cosmology and Astroparticle Physics 2024, no. 06 (2024): 037. http://dx.doi.org/10.1088/1475-7516/2024/06/037.

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Abstract The Hubble diagram of quasars, as candidates to “standardizable” candles, has been used to measure the expansion history of the Universe at late times, up to very high redshifts (z ∼ 7). It has been shown that this history, as inferred from the quasar dataset, deviates at ≳ 3σ level from the concordance (ΛCDM) cosmology model preferred by the cosmic microwave background (CMB) and other datasets. In this article, we investigate whether new physics beyond ΛCDM (BΛCDM) or beyond the Standard Model (BSM) could make the quasar data consistent with the concordance model. We first show that

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Paradiso, S., G. McGee, and W. J. Percival. "Evaluating extensions to LCDM: an application of Bayesian model averaging and selection." Journal of Cosmology and Astroparticle Physics 2024, no. 10 (2024): 021. http://dx.doi.org/10.1088/1475-7516/2024/10/021.

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Abstract We present a powerful and innovative statistical framework to address key cosmological questions about the universe's fundamental properties, performing Bayesian model averaging (BMA) and model selection. Utilizing this framework, we systematically explore extensions beyond the standard ΛCDM model, considering a varying curvature density parameter ΩK, a spectral index ns = 1 and a varying n run, a constant dark energy equation of state (EOS) w 0CDM and a time-dependent one w 0 w aCDM. We also assess cosmological data against a varying effective number of neutrino species N eff. Our an

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Hu, Jian-Ping, and Fa-Yin Wang. "Hubble Tension: The Evidence of New Physics." Universe 9, no. 2 (2023): 94. http://dx.doi.org/10.3390/universe9020094.

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The ΛCDM model provides a good fit to most astronomical observations but harbors large areas of phenomenology and ignorance. With the improvements in the precision and number of observations, discrepancies between key cosmological parameters of this model have emerged. Among them, the most notable tension is the 4σ to 6σ deviation between the Hubble constant (H0) estimations measured by the local distance ladder and the cosmic microwave background (CMB) measurement. In this review, we revisit the H0 tension based on the latest research and sort out evidence from solutions to this tension that

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17

Pedersen, Christian, Andreu Font-Ribera, Keir K. Rogers та ін. "An emulator for the Lyman-α forest in beyond-ΛCDM cosmologies". Journal of Cosmology and Astroparticle Physics 2021, № 05 (2021): 033. http://dx.doi.org/10.1088/1475-7516/2021/05/033.

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18

Brando, Guilherme, Bartolomeo Fiorini, Kazuya Koyama та Hans A. Winther. "Enabling matter power spectrum emulation in beyond-ΛCDM cosmologies with COLA". Journal of Cosmology and Astroparticle Physics 2022, № 09 (2022): 051. http://dx.doi.org/10.1088/1475-7516/2022/09/051.

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Abstract We compare and validate COLA (COmoving Lagrangian Acceleration) simulations against existing emulators in the literature, namely Bacco and Euclid Emulator 2. Our analysis focuses on the non-linear response function, i.e., the ratio between the non-linear dark matter power spectrum in a given cosmology with respect to a pre-defined reference cosmology, which is chosen to be the Euclid Emulator 2 reference cosmology in this paper. We vary three cosmological parameters, the total matter density, the amplitude of the primordial scalar perturbations and the spectral index. By comparing the

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19

Cataneo, M., J. D. Emberson, D. Inman, J. Harnois-Déraps, and C. Heymans. "On the road to per cent accuracy – III. Non-linear reaction of the matter power spectrum to massive neutrinos." Monthly Notices of the Royal Astronomical Society 491, no. 3 (2019): 3101–7. http://dx.doi.org/10.1093/mnras/stz3189.

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ABSTRACT We analytically model the non-linear effects induced by massive neutrinos on the total matter power spectrum using the halo model reaction framework of Cataneo et al. In this approach, the halo model is used to determine the relative change to the matter power spectrum caused by new physics beyond the concordance cosmology. Using standard fitting functions for the halo abundance and the halo mass–concentration relation, the total matter power spectrum in the presence of massive neutrinos is predicted to per cent-level accuracy, out to $k=10 \,{ h}\,{\rm Mpc}^{-1}$. We find that refini

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20

Hu, J. P., X. D. Jia, J. Hu, and F. Y. Wang. "Hints of New Physics for the Hubble Tension: Violation of Cosmological Principle." Astrophysical Journal Letters 975, no. 2 (2024): L36. http://dx.doi.org/10.3847/2041-8213/ad85cf.

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Abstract Discrepancy between the measurements of Hubble constant H 0 from the cosmic microwave background and the local distance ladder is the most serious challenge to the standard ΛCDM model. Recent research has pointed out that it might be related with the violation of cosmological principle. Here, we investigate the impact of dipole–monopole correction on the constraints of H 0 utilizing the dipole-fitting method based on the ΛCDM model and cosmography method. Our results show that the dipole–monopole correction can reduce the constraints of H 0 from a larger value consistent with SH0ES re

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21

Petreca, A. Turmina, M. Benetti та S. Capozziello. "Beyond ΛCDM with f(z)CDM: Criticalities and solutions of Padé Cosmography". Physics of the Dark Universe 44 (травень 2024): 101453. http://dx.doi.org/10.1016/j.dark.2024.101453.

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22

Beordo, William, Mariateresa Crosta та Mario Gilberto Lattanzi. "Exploring Milky Way rotation curves with Gaia DR3: a comparison between ΛCDM, MOND, and general relativistic approaches". Journal of Cosmology and Astroparticle Physics 2024, № 12 (2024): 024. https://doi.org/10.1088/1475-7516/2024/12/024.

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Abstract With the release of Gaia DR3, we extend the comparison between dynamical models for the Milky Way rotation curve initiated in the previous work. Utilising astrometric and spectro-photometric data for 719143 young disc stars within |z| < 1 kpc and up to R ≃ 19 kpc, we investigate the accuracy of MOND and ΛCDM frameworks in addition to previously studied models, such as the classical one with a Navarro-Frenk-White dark matter halo and a general relativistic model. We find that all models, including MOND and ΛCDM, are statistically equivalent in representing the observed rotational ve

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23

Kumar, Suresh, Rafael C. Nunes, and Santosh Kumar Yadav. "Testing the warmness of dark matter." Monthly Notices of the Royal Astronomical Society 490, no. 1 (2019): 1406–14. http://dx.doi.org/10.1093/mnras/stz2676.

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ABSTRACT Dark matter (DM) as a pressureless perfect fluid provides a good fit of the standard Λ cold dark matter (ΛCDM) model to the astrophysical and cosmological data. In this paper, we investigate two extended properties of DM: a possible time dependence of the equation of state of DM via Chevallier–Polarski–Linder parametrization, wdm = wdm0 + wdm1(1 − a), and the constant non-null sound speed $\hat{c}^2_{\rm s,dm}$. We analyse these DM properties on top of the base ΛCDM model by using the data from Planck cosmic microwave background (CMB) temperature and polarization anisotropy, baryonic

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24

Alexeyev, Stanislav, and Vyacheslav Prokopov. "Extended Gravity Constraints at Different Scales." Universe 8, no. 5 (2022): 283. http://dx.doi.org/10.3390/universe8050283.

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We review a set of the possible ways to constrain extended gravity models at Galaxy clusters scales (the regime of dark energy explanations and comparison with ΛCDM), for black hole shadows, gravitational wave astronomy, binary pulsars, the Solar system and a Large Hadron Collider (consequences for high-energy physics at TeV scale). The key idea is that modern experimental and observational precise data provide us with the chance to go beyond general relativity.

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25

Lee, Bum-Hoon, Wonwoo Lee, Eoin Ó Colgáin, M. M. Sheikh-Jabbari, and Somyadip Thakur. "Is local H ₀ at odds with dark energy EFT?" Journal of Cosmology and Astroparticle Physics 2022, no. 04 (2022): 004. http://dx.doi.org/10.1088/1475-7516/2022/04/004.

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Abstract Local H_0 determinations currently fall in a window between H 0 ∼ 70 km/s/Mpc (TRGB) and H 0 ∼ 76 km/s/Mpc (Tully-Fisher). In contrast, BAO data calibrated in an early ΛCDM universe are largely consistent with Planck-ΛCDM, H 0 ∼ 67.5 km/s/Mpc. Employing a generic two parameter family of evolving equations of state (EoS) for dark energy (DE) w DE(z) and mock BAO data, we demonstrate that if i) w DE(z = 0) < -1 and ii) integrated DE density less than ΛCDM, then H 0 increases. EoS that violate these conditions at best lead to modest H 0 increases within 1σ. Tellingly, Quintessence and

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Bose, Benjamin, Matteo Cataneo, Tilman Tröster, Qianli Xia, Catherine Heymans та Lucas Lombriser. "On the road to per cent accuracy IV: ReACT – computing the non-linear power spectrum beyond ΛCDM". Monthly Notices of the Royal Astronomical Society 498, № 4 (2020): 4650–62. http://dx.doi.org/10.1093/mnras/staa2696.

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ABSTRACT To effectively exploit large-scale structure surveys, we depend on accurate and reliable predictions of non-linear cosmological structure formation. Tools for efficient and comprehensive computational modelling are therefore essential to perform cosmological parameter inference analyses. We present the public software package ReACT, demonstrating its capability for the fast and accurate calculation of non-linear power spectra from non-standard physics. We showcase ReACT through a series of analyses on the DGP and f(R) gravity models, adopting LSST-like cosmic shear power spectra. Accu

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Garrison, Lehman H., Michael Joyce, and Daniel J. Eisenstein. "Good and proper: self-similarity of N-body simulations with proper force softening." Monthly Notices of the Royal Astronomical Society 504, no. 3 (2021): 3550–60. http://dx.doi.org/10.1093/mnras/stab1096.

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ABSTRACT Analysis of self-similarity in scale-free N-body simulations reveals the spatial and temporal scales for which statistics measured in cosmological simulations are converged to the physical continuum limit. We examine how the range of scales in which the two-point correlation function is converged depends on the force softening length and whether it is held constant in comoving or proper coordinates. We find that a proper softening that reaches roughly 1/30th of the inter-particle spacing by the end of the simulation resolves the same spatial and temporal scales as a comoving softening

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Steinhardt, Charles L., Albert Sneppen, Thorbjørn Clausen, Harley Katz, Martin P. Rey та Jonas Stahlschmidt. "The Highest-redshift Balmer Breaks as a Test of ΛCDM". Astrophysical Journal 967, № 2 (2024): 172. http://dx.doi.org/10.3847/1538-4357/ad3afb.

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Abstract Recent studies have reported tension between the presence of luminous, high-redshift galaxies and the halo mass functions predicted by standard cosmology. Here, an improved test is proposed using the presence of high-redshift Balmer breaks to probe the formation of early 104–105 M ⊙ baryonic minihalos. Unlike previous tests, this does not depend upon the mass-to-light ratio and has only a slight dependence upon the metallicity, stellar initial mass function, and star formation history, which are all weakly constrained at high redshift. We show that the strongest Balmer breaks allowed

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29

Gough, Alex, and Cora Uhlemann. "One-Point Statistics Matter in Extended Cosmologies." Universe 8, no. 1 (2022): 55. http://dx.doi.org/10.3390/universe8010055.

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The late universe contains a wealth of information about fundamental physics and gravity, wrapped up in non-Gaussian fields. To make use of as much information as possible, it is necessary to go beyond two-point statistics. Rather than going to higher-order N-point correlation functions, we demonstrate that the probability distribution function (PDF) of spheres in the matter field (a one-point function) already contains a significant amount of this non-Gaussian information. The matter PDF dissects different density environments which are lumped together in two-point statistics, making it parti

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30

Moradinezhad Dizgah, Azadeh, Emilio Bellini, and Garrett K. Keating. "Probing Dark Energy and Modifications of Gravity with Ground-based millimeter-wavelength Line Intensity Mapping." Astrophysical Journal 965, no. 1 (2024): 19. http://dx.doi.org/10.3847/1538-4357/ad2078.

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Abstract Line intensity mapping (LIM) can provide a powerful means to constrain the theory of gravity and the nature of dark energy at low and high redshifts by mapping the large-scale structure over many redshift epochs. In this paper, we investigate the potential of the next generation ground-based millimeter-wavelength LIM surveys in constraining several models beyond ΛCDM, involving either a dynamic dark energy component or modifications of the theory of gravity. Limiting ourselves to two-point clustering statistics, we consider the measurements of auto-spectra of several CO rotational lin

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31

Berti, M., M. Spinelli, B. S. Haridasu, M. Viel та A. Silvestri. "Constraining beyond ΛCDM models with 21cm intensity mapping forecasted observations combined with latest CMB data". Journal of Cosmology and Astroparticle Physics 2022, № 01 (2022): 018. http://dx.doi.org/10.1088/1475-7516/2022/01/018.

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Abstract We explore constraints on dark energy and modified gravity with forecasted 21cm intensity mapping measurements using the Effective Field Theory approach. We construct a realistic mock data set forecasting a low redshift 21cm signal power spectrum P 21(z,k) measurement from the MeerKAT radio-telescope. We compute constraints on cosmological and model parameters through Monte-Carlo Markov-Chain techniques, testing both the constraining power of P 21(k) alone and its effect when combined with the latest Planck 2018 CMB data. We complement our analysis by testing the effects of tomography

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32

Huang, Lu, Zhi-Qi Huang, Zhuo-Yang Li, and Huan Zhou. "A more accurate Parameterization based on cosmic Age (MAPAge)." Research in Astronomy and Astrophysics 21, no. 11 (2021): 277. http://dx.doi.org/10.1088/1674-4527/21/11/277.

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Abstract Recently, several statistically significant tensions between different cosmological datasets have raised doubts about the standard Lambda cold dark matter (ΛCDM) model. A recent letter (Huang 2020) suggests to use “Parameterization based on cosmic Age” (PAge) to approximate a broad class of beyond-ΛCDM models, with a typical accuracy ∼1% in angular diameter distances at z ≲ 10. In this work, we extend PAge to a More Accurate Parameterization based on cosmic Age (MAPAge) by adding a new degree of freedom η 2. The parameter η 2 describes the difference between physically motivated model

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Capozziello, Salvatore, Giuseppe Sarracino, and Giulia De Somma. "A Critical Discussion on the H0 Tension." Universe 10, no. 3 (2024): 140. http://dx.doi.org/10.3390/universe10030140.

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A critical discussion on the H0 Hubble constant tension is presented by considering both early and late-type observations. From recent precise measurements, discrepancies emerge when comparing results for some cosmological quantities obtained at different redshifts. We highlight the most relevant measurements of H0 and propose potential ideas to solve its tension. These solutions concern the exploration of new physics beyond the ΛCDM model or the evaluation of H0 by other methods. In particular, we focus on the role of the look-back time.

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Maus, M., S. Chen, M. White, et al. "An analysis of parameter compression and Full-Modeling techniques with Velocileptors for DESI 2024 and beyond." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 138. https://doi.org/10.1088/1475-7516/2025/01/138.

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Abstract In anticipation of forthcoming data releases of current and future spectroscopic surveys, we present the validation tests and analysis of systematic effects within velocileptors modeling pipeline when fitting mock data from the AbacusSummit N-body simulations. We compare the constraints obtained from parameter compression methods to the direct fitting (Full-Modeling) approaches of modeling the galaxy power spectra, and show that the ShapeFit extension to the traditional template method is consistent with the Full-Modeling method within the standard ΛCDM parameter space. We show the de

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Ocampo, I., G. Cañas-Herrera, and S. Nesseris. "Neural Networks for cosmological model selection and feature importance using Cosmic Microwave Background data." Journal of Cosmology and Astroparticle Physics 2025, no. 02 (2025): 004. https://doi.org/10.1088/1475-7516/2025/02/004.

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Abstract The measurements of the temperature and polarisation anisotropies of the Cosmic Microwave Background (CMB) by the ESA Planck mission have strongly supported the current concordance model of cosmology. However, the latest cosmological data release from ESA Planck mission still has a powerful potential to test new data science algorithms and inference techniques. In this paper, we use advanced Machine Learning (ML) algorithms, such as Neural Networks (NNs), to discern among different underlying cosmological models at the angular power spectra level, using both temperature and polarisati

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Balaudo, Anna, Alice Garoffolo, Matteo Martinelli, Suvodip Mukherjee, and Alessandra Silvestri. "Prospects of testing late-time cosmology with weak lensing of gravitational waves and galaxy surveys." Journal of Cosmology and Astroparticle Physics 2023, no. 06 (2023): 050. http://dx.doi.org/10.1088/1475-7516/2023/06/050.

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Abstract We investigate the synergy of upcoming galaxy surveys and gravitational wave (GW) experiments in constraining late-time cosmology, examining the cross-correlations between the weak lensing of gravitational waves (GW-WL) and the galaxy fields. Without focusing on any specific GW detector configuration, we benchmark the requirements for the high precision measurement of cosmological parameters by considering several scenarios, varying the number of detected GW events and the uncertainty on the inference of the source luminosity distance and redshift. We focus on ΛCDM and scalar-tensor c

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Pawlowski, Marcel S., and Sangmo Tony Sohn. "On the Co-orbitation of Satellite Galaxies along the Great Plane of Andromeda: NGC 147, NGC 185, and Expectations from Cosmological Simulations." Astrophysical Journal 923, no. 1 (2021): 42. http://dx.doi.org/10.3847/1538-4357/ac2aa9.

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Abstract Half of the satellite galaxies of Andromeda form a narrow plane termed the Great Plane of Andromeda (GPoA), and their line-of-sight velocities display a correlation reminiscent of a rotating structure. Recently reported first proper-motion measurements for the on-plane satellites NGC 147 and NGC 185 indicate that they indeed co-orbit along the GPoA. This provides a novel opportunity to compare the M31 satellite system to ΛCDM expectations. We perform the first detailed comparison of the orbital alignment of two satellite galaxies beyond the Milky Way with several hydrodynamical and da

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Sakr, Ziad, Stéphane Ilić, Alain Blanchard, Jamal Bittar, and Wehbeh Farah. "Cluster counts: Calibration issue or new physics?" Astronomy & Astrophysics 620 (November 30, 2018): A78. http://dx.doi.org/10.1051/0004-6361/201833151.

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In recent years, the amplitude of matter fluctuations inferred from low-redshift probes has been found to be generally lower than the value derived from cosmic microwave background (CMB) observations in the ΛCDM model. This tension has been exemplified by Sunyaev-Zel’dovich and X-ray cluster counts which, when using theirPlanckstandard cluster mass calibration, yield a value ofσ8, appreciably lower than estimations based on the latestPlanckCMB measurements. In this work we examine whether non-minimal neutrino masses can alleviate this tension substantially. We used the cluster X-ray temperatur

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Camera, Stefano, та Hamsa Padmanabhan. "Beyond ΛCDM with H i intensity mapping: robustness of cosmological constraints in the presence of astrophysics". Monthly Notices of the Royal Astronomical Society 496, № 4 (2020): 4115–26. http://dx.doi.org/10.1093/mnras/staa1663.

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ABSTRACT Mapping the unresolved intensity of the 21-cm emission of neutral hydrogen (H i) is now regarded as one the most promising tools for cosmological investigation in the coming decades. Here, we investigate, for the first time, extensions of the standard cosmological model, such as modified gravity and primordial non-Gaussianity, taking self-consistently into account. The present constraints on the astrophysics of H i clustering in the treatment of the brightness temperature fluctuations. To understand the boundaries within which results thus obtained can be considered reliable, we exami

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Brouwer, Margot M., Kyle A. Oman, Edwin A. Valentijn, et al. "The weak lensing radial acceleration relation: Constraining modified gravity and cold dark matter theories with KiDS-1000." Astronomy & Astrophysics 650 (June 2021): A113. http://dx.doi.org/10.1051/0004-6361/202040108.

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We present measurements of the radial gravitational acceleration around isolated galaxies, comparing the expected gravitational acceleration given the baryonic matter (gbar) with the observed gravitational acceleration (gobs), using weak lensing measurements from the fourth data release of the Kilo-Degree Survey (KiDS-1000). These measurements extend the radial acceleration relation (RAR), traditionally measured using galaxy rotation curves, by 2 decades in gobs into the low-acceleration regime beyond the outskirts of the observable galaxy. We compare our RAR measurements to the predictions of

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Hurier, G., and R. E. Angulo. "Measuring the hydrostatic mass bias in galaxy clusters by combining Sunyaev–Zel’dovich and CMB lensing data." Astronomy & Astrophysics 610 (February 2018): L4. http://dx.doi.org/10.1051/0004-6361/201731999.

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The cosmological parameters preferred by the cosmic microwave background (CMB) primary anisotropies predict many more galaxy clusters than those that have been detected via the thermal Sunyaev–Zeldovich (tSZ) effect. This discrepancy has attracted considerable attention since it might be evidence of physics beyond the simplest ΛCDM model. However, an accurate and robust calibration of the mass-observable relation for clusters is necessary for the comparison, which has been proven difficult to obtain so far. Here, we present new constraints on the mass–pressure relation by combining tSZ and CMB

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Takadera, Toshiki, Takashi Hiramatsu, and Tsutomu Kobayashi. "Spherical collapse in DHOST theories and EFT of dark energy." Journal of Cosmology and Astroparticle Physics 2025, no. 07 (2025): 006. https://doi.org/10.1088/1475-7516/2025/07/006.

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Abstract We study the nonlinear evolution of matter overdensities using the spherical collapse model in degenerate higher-order scalar-tensor (DHOST) theories beyond Horndeski, employing the effective field theory (EFT) of dark energy approach. We investigate the impact of the EFT parameters characterising DHOST theories on the formation of large-scale structure. We identify the parameter space in which the collapse of the spherical overdensity is prevented by the scalar field turning imaginary at some moment, which allows us to place constraints on the model parameters. We show how the collap

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Deng, Heling. "μ-distortion around stupendously large primordial black holes". Journal of Cosmology and Astroparticle Physics 2021, № 11 (2021): 054. http://dx.doi.org/10.1088/1475-7516/2021/11/054.

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Abstract In a variety of mechanisms generating primordial black holes, each black hole is expected to form along with a surrounding underdense region that roughly compensates the black hole mass. This region will propagate outwards and expand as a shell at the speed of sound in the homogeneous background. Dissipation of the shell due to Silk damping could lead to detectable μ-distortion in the CMB spectrum: if black holes are rare on the last scattering surface, the signal(s) would be pointlike; whereas if there are a sufficient number of them, we could have a uniform distortion in the CMB sky

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Laghi, Danny, Nicola Tamanini, Walter Del Pozzo, et al. "Gravitational-wave cosmology with extreme mass-ratio inspirals." Monthly Notices of the Royal Astronomical Society 508, no. 3 (2021): 4512–31. http://dx.doi.org/10.1093/mnras/stab2741.

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ABSTRACT The Laser Interferometer Space Antenna (LISA) will open the mHz frequency window of the gravitational-wave (GW) landscape. Among all the new GW sources expected to emit in this frequency band, extreme mass-ratio inspirals (EMRIs) constitute a unique laboratory for astrophysics and fundamental physics. Here, we show that EMRIs can also be used to extract relevant cosmological information, complementary to both electromagnetic (EM) and other GW observations. By using the loudest EMRIs (S/N &gt; 100) detected by LISA as dark standard sirens, statistically matching their sky localizat

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Pal, Sourav, Rickmoy Samanta, and Supratik Pal. "Revisiting coupled CDM-massive neutrino perturbations in diverse cosmological backgrounds." Journal of Cosmology and Astroparticle Physics 2023, no. 12 (2023): 004. http://dx.doi.org/10.1088/1475-7516/2023/12/004.

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Abstract Massive neutrinos are well-known to cause a characteristic suppression in the growth of structures at scales below the neutrino free-streaming length. A detailed understanding of this suppression is essential in the era of precision cosmology we are entering into, enabling us to better constrain the total neutrino mass and possibly probe (beyond)-ΛCDM cosmological model(s). Instead of the usual N-body simulation or Boltzmann solver, in this article we consider a two-fluid framework at the linear scales, where the neutrino fluid perturbations are coupled to the CDM (+ baryon) fluid via

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Batista, Ronaldo C. "On the virialization threshold for halo mass functions." Journal of Cosmology and Astroparticle Physics 2025, no. 03 (2025): 068. https://doi.org/10.1088/1475-7516/2025/03/068.

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Abstract In a recent study by Euclid collaboration, the Halo Mass Function (HMF) has been fitted with accuracy better than 1% for the ΛCDM model. Several parameters were introduced and fitted against N-body simulations, assuming the usual linearly extrapolated matter density contrast at the collapse time, δc , as a basic threshold for halo formation. As a result, a new function that multiplies δc was introduced, producing an effective threshold that varies both with redshift and mass scale. We show that the redshift evolution of this effective threshold is similar to the one of the linear extr

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Suyu, Sherry H. "Progress toward an accurate Hubble Constant." Proceedings of the International Astronomical Union 13, S336 (2017): 80–85. http://dx.doi.org/10.1017/s1743921318000133.

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AbstractThe Hubble constant is a key cosmological parameter that sets the present-day expansion rate as well as the age, size, and critical density of the Universe. Intriguingly, there is currently a tension in the measurements of its value in the standard flat ΛCDM model – observations of the Cosmic Microwave Background with the Planck satellite lead to a value of the Hubble constant that is lower than the measurements from the local Cepheids-supernovae distance ladder and strong gravitational lensing. Precise and accurate Hubble constant measurements from independent probes, including water

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Pandey, Biswajit. "The Time Evolution of Mutual Information between Disjoint Regions in the Universe." Entropy 25, no. 7 (2023): 1094. http://dx.doi.org/10.3390/e25071094.

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We study the time evolution of mutual information between mass distributions in spatially separated but casually connected regions in an expanding universe. The evolution of mutual information is primarily determined by the configuration entropy rate, which depends on the dynamics of the expansion and growth of density perturbations. The joint entropy between distributions from the two regions plays a negligible role in such evolution. Mutual information decreases with time in a matter-dominated universe, whereas it stays constant in a Λ-dominated universe. The ΛCDM model and some other models

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Yniguez, Basilio, Shea Garrison-Kimmel, Michael Boylan-Kolchin, and James S. Bullock. "On the stark difference in satellite distributions around the Milky Way and Andromeda." Monthly Notices of the Royal Astronomical Society 439, no. 1 (2014): 73–82. http://dx.doi.org/10.1093/mnras/stt2058.

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Abstract We compare spherically averaged radial number counts of bright (≳105 L⊙) dwarf satellite galaxies within 400 kpc of the Milky Way (MW) and M31 and find that the MW satellites are much more centrally concentrated. Remarkably, the two satellite systems are almost identical within the central 100 kpc, while M31 satellites outnumber MW satellites by about a factor of 4 at deprojected distances spanning 100–400 kpc. We compare the observed distributions to those predicted for Λ cold dark matter (ΛCDM) subhaloes using a suite of 44 high-resolution ∼1012 M⊙ halo zoom simulations, 22 of which

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Thompson, Rodger I. "Non-Canonical Dark Energy Parameter Evolution in a Canonical Quintessence Cosmology." Universe 10, no. 9 (2024): 356. http://dx.doi.org/10.3390/universe10090356.

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This study considers the specific case of a flat, minimally coupled to gravity, quintessence cosmology with a dark energy quartic polynomial potential that has the same mathematical form as the Higgs potential. Previous work on this case determined that the scalar field is given by a simple expression of the Lambert W function in terms of the easily observable scale factor. This expression provides analytic equations for the evolution of cosmological dark energy parameters as a function of the scale factor for all points on the Lambert W function principal branch. The Lambert W function is zer

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