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Journal articles on the topic 'Inflation'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

GERMÁN, G., and A. DE LA MACORRA. "INFLATION AT THE MAXIMA OF SYMMETRIC POTENTIALS." International Journal of Modern Physics A 20, no. 28 (2005): 6451–59. http://dx.doi.org/10.1142/s0217751x05025541.

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We construct a two-stage inflationary model which can accommodate early inflation at a scale Λ1 as well as a second stage of inflation at Λ2 with a single scalar field ϕ. We use a symmetric potential, valid in a frictionless world, in which the two inflationary periods have exactly the same scale, i.e. Λ1 = Λ2. However, we see today Λ1 ≫ Λ2 due to the friction terms (expansion of the universe and interaction with matter). These type of models can be motivated from supergravity. Inflation occurs close to the maxima of the potential. As a consequence both inflations are necessarily finite. This

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2

Salvio, Alberto. "Natural-scalaron inflation." Journal of Cosmology and Astroparticle Physics 2021, no. 10 (2021): 011. http://dx.doi.org/10.1088/1475-7516/2021/10/011.

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Abstract A pseudo Nambu-Goldstone boson (such as an axion-like particle) is a theoretically well-motivated inflaton as it features a naturally flat potential (natural inflation). This is because Goldstone's theorem protects its potential from sizable quantum corrections. Such corrections, however, generically generates an R 2 term in the action, which leads to another inflaton candidate because of the equivalence between the R 2 term and a scalar field, the scalaron, with a quasi flat potential (Starobinsky inflation). Here it is investigated a new multifield scenario in which both the scalaro

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3

Watson, Scott, Malcolm J. Perry, Gordon L. Kane, and Fred C. Adams. "Inflation without inflaton(s)." Journal of Cosmology and Astroparticle Physics 2007, no. 11 (2007): 017. http://dx.doi.org/10.1088/1475-7516/2007/11/017.

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4

Arciniega, Gustavo, Pablo Bueno, Pablo A. Cano, José D. Edelstein, Robie A. Hennigar, and Luisa G. Jaime. "Cosmic inflation without inflaton." International Journal of Modern Physics D 28, no. 14 (2019): 1944008. http://dx.doi.org/10.1142/s0218271819440085.

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We propose a novel explanation for universe’s inflationary period. We argue that when the Einstein–Hilbert action is supplemented by an infinite tower of higher-curvature terms — selected order by order by the criterium that they give rise to a well-posed cosmological evolution — the usual Big Bang characteristic of Einstein gravity is replaced by a singularity-free period of exponential growth of the scale factor, which is gracefully connected with standard late-time [Formula: see text]CDM cosmology. No inflaton or any additional fields besides the metric are required.

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LEE, LU-YUN, KINGMAN CHEUNG, and CHIA-MIN LIN. "COMMENTS ON SUSY INFLATION MODELS ON THE BRANE." Modern Physics Letters A 25, no. 24 (2010): 2105–10. http://dx.doi.org/10.1142/s0217732310033487.

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In this paper we consider a class of inflation models on the brane where the dominant part of the inflaton scalar potential does not depend on the inflaton field value during inflation. In particular, we consider supernatural inflation, its hilltop version, A-term inflation, and supersymmetric (SUSY) D- and F-term hybrid inflation on the brane. We show that the parameter space can be broadened, the inflation scale generally can be lowered, and still possible to have the spectral index ns = 0.96.

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6

James, Harold. "Hyperinflation after the First World War in Central Europe: Causes, Remedies, Consequences." Financial and Economic Review 23, no. 4 (2024): 54–68. https://doi.org/10.33893/fer.23.4.54.

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The paper examines in detail Germany and Poland, two of the four post-First World War hyperinflations that provided the subject of Thomas Sargent’s classic comparative study of the circumstances in which inflations might be ended. It counterposes the Czechoslovak case, where stabilisation occurred without prior hyperinflation. Stabilisation brought substantial costs, most obviously in terms of recession and unemployment. The peripheral inflating countries had sought to use inflation to effect an international as well as an internal redistribution of wealth. Ending the inflation was thus politi

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7

Fujita, Tomohiro, Kyohei Mukaida, and Tenta Tsuji. "Reheating after axion inflation." Journal of Cosmology and Astroparticle Physics 2025, no. 07 (2025): 002. https://doi.org/10.1088/1475-7516/2025/07/002.

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Abstract We investigate the reheating process in an axion inflation model where the inflaton couples to non-Abelian gauge fields via the Chern-Simons coupling. The Chern-Simons coupling leads to the efficient production of gauge fields via a tachyonic instability during inflation, whose implications have been actively studied in the literatures. Moreover, it has been recently pointed out that the produced gauge fields can be even thermalized during inflation, leading to warm inflation. Apparently, these findings seem to imply that the reheating is completed immediately after inflation because

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CHOU, CHUNG-HSIEN, and HOI-LAI YU. "DIGITAL ORIGIN OF COSMIC INFLATION." Modern Physics Letters A 25, no. 18 (2010): 1483–89. http://dx.doi.org/10.1142/s0217732310033219.

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Assuming our physical universe processes and registers information to determine its dynamical evolution, one can put serious constraints on the cosmology that our universe can bear, in particular, the origin of cosmic inflation. The universe evolves to gain her computation capacity which is linear in time t. On the other hand, the growth in content of degrees of freedom (i.e. by integrating in more galaxies) is as t3/2 through expansion. When the in flux of degrees of freedom of the universe grows beyond some value, the computation capacity of the universe becomes insufficient to determine its

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9

Narita, Yuma, Fuminobu Takahashi, and Wen Yin. "QCD axion hybrid inflation." Journal of Cosmology and Astroparticle Physics 2023, no. 12 (2023): 039. http://dx.doi.org/10.1088/1475-7516/2023/12/039.

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Abstract When the inflaton is coupled to the gluon Chern-Simons term for successful reheating, mixing between the inflaton and the QCD axion is generally expected given the solution of the strong CP problem by the QCD axion. This is particularly natural if the inflaton is a different, heavier axion. We propose a scenario in which the QCD axion plays the role of the inflaton by mixing with heavy axions. In particular, if the energy scale of inflation is lower than the QCD scale, a hybrid inflation is realized where the QCD axion plays the role of the inflaton in early stages. We perform detaile

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10

Morishita, Yukiyoshi, Tomo Takahashi, and Shuichiro Yokoyama. "Multi-chaotic inflation with and without spectator field." Journal of Cosmology and Astroparticle Physics 2022, no. 07 (2022): 042. http://dx.doi.org/10.1088/1475-7516/2022/07/042.

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Abstract Motivated by the result of Planck+BICEP/Keck recently released, we investigate the consistency of the multi-field inflation models in terms of the spectral index ns and the tensor-to-scalar ratio r. In this study, we focus on double-inflaton models with and without a spectator field. We find that inflaton with a quadratic potential can become viable when three fields with a specific hierarchical mass spectrum are realized such that two fields act as inflatons and the other one is the spectator. We also discuss the conditions to avoid the fine-tuning, by careful study of how the predic

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11

Salunkhe, Bhavesh, and Anuradha Patnaik. "Inflation Dynamics and Monetary Policy in India: A New Keynesian Phillips Curve Perspective." South Asian Journal of Macroeconomics and Public Finance 8, no. 2 (2019): 144–79. http://dx.doi.org/10.1177/2277978719861186.

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The present study estimates various specifications of the New Keynesian Phillips Curve (NKPC) models for India over 1996Q2 to 2017Q2 using Consumer Price Index (CPI) and Wholesale Price Index (WPI) inflation, separately. The empirical results suggest that the data support all the specifications of the Phillips curve models based on both the CPI and WPI inflations. However, the backward looking and hybrid models provide robust results for both the inflation indices. While the forward-looking behaviour dominates the CPI inflation trajectory, the backward-looking behaviour greatly influences the

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12

Aliraqi, Ali. "Inflation’s Impact on Sudan Exports 1990-2020: An ARDL Approach." World Journal of Entrepreneurship, Management and Sustainable Development 18, no. 6 (2023): 707–27. http://dx.doi.org/10.47556/j.wjemsd.18.6.2022.2.

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Purpose: This study investigates the inflation-export nexus in Sudan over the period 1990- 2020. Design/methodology: The study is based on quantitative and qualitative methods, estimating the export function and measuring the impact of its determinants over a prolonged period of time; the Autoregressive Distributed Lag (ARDL) methodology was used to analyse the co-integration. Findings: Findings have undoubtedly shown inflation’s negative impact on exports over the period 1990-2020. Broadly speaking, the long-term results indicated that the most important variable affecting exports is the gros

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Drewes, Marco, Lei Ming, and Isabel Oldengott. "LiteBIRD and CMB-S4 sensitivities to reheating in plateau models of inflation." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 081. http://dx.doi.org/10.1088/1475-7516/2024/05/081.

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Abstract We study the sensitivity of LiteBIRD and CMB-S4 to the reheating temperature and the inflaton coupling in three types of plateau-potential models of inflation, namely mutated hilltop inflation, radion gauge inflation, and α-attractor T models. We first find relations between model parameters and CMB observables in all models. We then perform Monte Carlo Markov Chain based forecasts to quantify the information gain on the reheating temperature, the inflaton coupling, and the scale of inflation that can be achieved with LiteBIRD and CMB-S4, assuming a fiducial tensor-to-scalar ratio r̅

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14

Yang, Hyun Seok. "Emergent Spacetime and Cosmic Inflation." Universe 10, no. 3 (2024): 150. http://dx.doi.org/10.3390/universe10030150.

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We present a novel background-independent framework for cosmic inflation, starting with a matrix model. In this framework, inflation is portrayed as a dynamic process responsible for the generation of both space and time. This stands in contrast to conventional inflation, which is characterized as a mere (exponential) expansion of an already existing spacetime, driven by the vacuum energy associated with an inflaton field. We observe that the cosmic inflation is triggered by the condensate of Planck energy into a vacuum and responsible for the dynamical emergence of spacetime. The emergent spa

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15

Richardson, C. A. "Power spectra of inspiratory nerve activity with lung inflations in cats." Journal of Applied Physiology 64, no. 4 (1988): 1709–20. http://dx.doi.org/10.1152/jappl.1988.64.4.1709.

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To investigate the effect of lung inflations on the high-frequency synchrony (70-122 Hz) observed in the inspiratory activity of respiratory motor nerves of decerebrate cats, I applied a step increase in lung inflation pressure at fixed delays into the inspiratory phase and computed power spectra of phrenic neurograms before and during inflation. In 25 decerebrate paralyzed cats the frequency of the high spectral peak was 92.3 +/- 11.1 Hz before and 105.3 +/- 12.1 Hz during the step in inflation pressure, shifting upward by 13.0 +/- 6.0 Hz. For 8 of the 25 cats, the recurrent laryngeal and phr

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16

ALLAHVERDI, ROUZBEH. "INFLATION AND THE MINIMAL SUPERSYMMETRIC STANDARD MODEL." Modern Physics Letters A 23, no. 33 (2008): 2799–809. http://dx.doi.org/10.1142/s0217732308028557.

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There is strong evidence from cosmological data that the universe underwent an epoch of superluminal expansion called inflation. A satisfactory embedding of inflation in fundamental physics has been an outstanding problem at the interface of cosmology and high energy physics. We show how inflation can be realized within the Minimal Supersymmetric Standard Model (MSSM). The inflaton candidates are two specific combinations of supersymmetric partners of quarks and leptons. MSSM inflation occurs at a low scale and generates perturbations in the range experimentally allowed by the latest data from

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Hossain, Wali. "Quintessential inflation: A unified scenario of inflation and dark energy." EPJ Web of Conferences 168 (2018): 04007. http://dx.doi.org/10.1051/epjconf/201816804007.

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Quintessential inflation unifies inflation and late time acceleration by a single scalar field. Such a scenario, with canonical and non-canonical scalar fields, has been discussed. The scalar field behaves as an inflaton field during inflation and as a quintessence field during late time. Also the predictions of the models has been compared with the recent Planck data.

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18

Kaplan, David E., and Neal Weiner. "Little inflatons and gauge inflation." Journal of Cosmology and Astroparticle Physics 2004, no. 02 (2004): 005. http://dx.doi.org/10.1088/1475-7516/2004/02/005.

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19

Berghaus, Kim V., Matthew Forslund, and Mark Vincent Guevarra. "Warm inflation with a heavy QCD axion." Journal of Cosmology and Astroparticle Physics 2024, no. 10 (2024): 103. http://dx.doi.org/10.1088/1475-7516/2024/10/103.

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Abstract We propose the first model of warm inflation in which the particle production emerges directly from coupling the inflaton to Standard Model particles. Warm inflation, an early epoch of sustained accelerated expansion at finite temperature, is a compelling alternative to cold inflation, with distinct predictions for inflationary observables such as the amplitude of fluctuations, the spectral tilt, the tensor-to-scalar ratio, and non-gaussianities. In our model a heavy QCD axion acts as the warm inflaton whose coupling to Standard Model gluons sources the thermal bath during warm inflat

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20

Barnaby, Neil. "Non-Gaussianity from Particle Production during Inflation." Advances in Astronomy 2010 (2010): 1–40. http://dx.doi.org/10.1155/2010/156180.

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In a variety of models the motion of the inflaton may trigger the production of some non-inflaton particles during inflation, for example via parametric resonance or a phase transition. Such models have attracted interest recently for a variety of reasons, including the possibility of slowing the motion of the inflaton on a steep potential. In this review we show that interactions between the produced particles and the inflaton condensate can lead to a qualitatively new mechanism for generating cosmological fluctuations from inflation. We illustrate this effect using a simple prototype modelg2

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Anisimov, Alexey, Yannick Bartocci та Fedor L. Bezrukov. "Inflaton mass in the νMSM inflation". Physics Letters B 671, № 2 (2009): 211–15. http://dx.doi.org/10.1016/j.physletb.2008.12.028.

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Nakayama, Kazunori, and Fuminobu Takahashi. "Alchemical inflation: inflaton turns into Higgs." Journal of Cosmology and Astroparticle Physics 2012, no. 11 (2012): 007. http://dx.doi.org/10.1088/1475-7516/2012/11/007.

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23

Thio, Marta, Jennifer A. Dawson, Kelly J. Crossley, et al. "Delivery of positive end-expiratory pressure to preterm lambs using common resuscitation devices." Archives of Disease in Childhood - Fetal and Neonatal Edition 104, no. 1 (2018): F83—F88. http://dx.doi.org/10.1136/archdischild-2017-314064.

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BackgroundIn neonatal resuscitation, a ventilation device providing positive end-expiratory pressure (PEEP) is recommended. There is limited information about PEEP delivery in vivo, using different models of self-inflating bag (SIB) at different inflation rates and PEEP settings.MethodsWe compared PEEP delivery to intubated preterm lambs using four commonly available models of paired SIBs and PEEP valves, with a T-piece, with gas flow of 8 L/min. Peak inspiratory pressure inflations of 30 cmH2O, combined with set PEEP of 5, 7 and 10 cmH2O, were delivered at rates of 20, 40 and 60/min. These co

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LAZARIDES, GEORGE. "HYBRID INFLATION FOLLOWED BY MODULAR INFLATION." International Journal of Modern Physics A 22, no. 31 (2007): 5747–59. http://dx.doi.org/10.1142/s0217751x07038980.

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Inflationary models with a superheavy scale F-term hybrid inflation followed by an intermediate scale modular inflation are considered. The restrictions on the power spectrum [Formula: see text] of curvature perturbation and the spectral index ns from the recent data within the power-law cosmological model with cold dark matter and a cosmological constant can be met provided that the number of e-foldings N HI * suffered by the pivot scale k* = 0.002/ Mpc during hybrid inflation is suitably restricted. The additional e-foldings needed for solving the horizon and flatness problems are generated

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Yamaguchi, Masahide, Kenji Kadota, and Teruhiko Kawano. "D-term chaotic inflation in supergravity and leptogenesisThis paper was prsented at the Theory CANADA 4 conference, held at the Centre de Recherches Mathématiques at the Université de Montréal, Québec, Canada on 4–7 June 2008." Canadian Journal of Physics 87, no. 3 (2009): 195–99. http://dx.doi.org/10.1139/p08-100.

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We review a model of D-term dominated chaotic inflation in supergravity. The F-flat direction present in this model is lifted by the dominant D-term, which leads to chaotic inflation and subsequent reheating. The leptogenesis scenario via the inflaton decay in this D-term chaotic inflation scenario is also discussed.

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Antoniadis, Ignatios. "Inflation from supersymmetry breaking." International Journal of Modern Physics A 33, no. 31 (2018): 1844021. http://dx.doi.org/10.1142/s0217751x18440219.

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I discuss a general class of models where the inflation is driven by supersymmetry breaking with the superpartner of the goldstino (sgoldstino) playing the role of the inflaton. Imposing an R-symmetry allows to satisfy easily the slow-roll conditions, avoiding the so-called [Formula: see text]-problem, and leads to two different classes of small field inflation models; they are characterized by an inflationary plateau around the maximum of the scalar potential, where R-symmetry is either restored or spontaneously broken, with the inflaton rolling down to a minimum describing the present phase

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Okano, So, and Tomohiro Fujita. "When does the Schwinger preheating occur?" Journal of Cosmology and Astroparticle Physics 2022, no. 03 (2022): 040. http://dx.doi.org/10.1088/1475-7516/2022/03/040.

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Abstract When the inflaton couples to photons and amplifies electric fields, charged particles produced via the Schwinger effect can dominate the universe after inflation, which is dubbed as the Schwinger preheating. Using the hydrodynamic approach for the Boltzmann equation, we numerically study two cases, the Starobinsky inflation model with the kinetic coupling and the Watanabe-Kanno-Soda inflation model. The Schwinger preheating is not observed in the latter model but occurs for a sufficiently large inflaton-photon coupling in the first model. We analytically address its condition and deri

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Davis, Anne-Christine, Philippe Brax, and Carsten van de Bruck. "Brane inflation and defect formation." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, no. 1877 (2008): 2833–42. http://dx.doi.org/10.1098/rsta.2008.0065.

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Brane inflation and the production of topological defects at the end of the inflationary phase are discussed. After a description of the inflationary set-up, we discuss the properties of the cosmic strings produced at the end of inflation. Specific examples of brane inflation are described, such as D − , D 3/ D 7 and modular inflations.

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AGARWAL, NIKITA. "Inflation of strongly connected networks." Mathematical Proceedings of the Cambridge Philosophical Society 150, no. 2 (2011): 367–84. http://dx.doi.org/10.1017/s0305004110000654.

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AbstractA coupled cell network is an inflation of if the dynamics of is embedded in as a quotient network. We give necessary and sufficient conditions for the existence of a strongly connected inflation of a strongly connected network. We provide a simple algorithm for the construction of a strongly connected inflation as a sequence of simple inflations.

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Lin, Chia-Min. "Uniform rate inflation." Journal of Cosmology and Astroparticle Physics 2023, no. 04 (2023): 037. http://dx.doi.org/10.1088/1475-7516/2023/04/037.

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Abstract In this work, I consider an inflation model with a quadratic potential and a negative cosmological constant. An analytical solution of the equation of motion for the inflaton field is found without slow-roll approximation. The result is that the inflation field is rolling at a constant speed. The prediction for cosmological perturbation is calculated.

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Kobayashi, Tatsuo, and Osamu Seto. "Beginning of Universe through large field hybrid inflation." Modern Physics Letters A 30, no. 21 (2015): 1550106. http://dx.doi.org/10.1142/s0217732315501060.

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Recent detection of B-mode polarization induced from tensor perturbations by the BICEP2 experiment implies the so-called large field inflation, where an inflaton field takes super-Planckian expectation value during inflation, at a high energy scale. We show however, if another inflation follows hybrid inflation, the hybrid inflation can generate a large tensor perturbation with not super-Planckian but Planckian field value. This scenario would relax the tension between BICEP2 and Planck concerning the tensor-to-scalar ratio, because a negative large running can also be obtained for a certain n

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Berera, Arjun. "The Warm Inflation Story." Universe 9, no. 6 (2023): 272. http://dx.doi.org/10.3390/universe9060272.

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Warm inflation has normalized two ideas in cosmology, that in the early universe the initial primordial density perturbations generally could be of classical rather than quantum origin and that during inflation, particle production from interactions amongst quantum field, and its backreaction effects, can occur concurrent with inflationary expansion. When we first introduced these ideas, both were met with resistance, but today they are widely accepted as possibilities with many models and applications based on them, which is an indication of the widespread influence of warm inflation. Open qu

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Montefalcone, Gabriele, Rudnei O. Ramos, Gustavo S. Vicente, and Katherine Freese. "Defying eternal inflation in warm inflation with a negative running." Journal of Cosmology and Astroparticle Physics 2024, no. 02 (2024): 006. http://dx.doi.org/10.1088/1475-7516/2024/02/006.

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Abstract It was pointed out previously [1] that a sufficiently negative running of the spectral index of curvature perturbations from (ordinary i.e. cold) inflation is able to prevent eternal inflation from ever occurring. Here, we reevaluate those original results, but in the context of warm inflation, in which a substantial radiation component (produced by the inflaton) exists throughout the inflationary period. We demonstrate that the same general requirements found in the context of ordinary (cold) inflation also hold true in warm inflation; indeed an even tinier amount of negative running

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BOYANOVSKY, D., C. DESTRI, H. J. DE VEGA, and N. G. SANCHEZ. "THE EFFECTIVE THEORY OF INFLATION IN THE STANDARD MODEL OF THE UNIVERSE AND THE CMB+LSS DATA ANALYSIS." International Journal of Modern Physics A 24, no. 20n21 (2009): 3669–864. http://dx.doi.org/10.1142/s0217751x09044553.

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Inflation is today a part of the Standard Model of the Universe supported by the cosmic microwave background (CMB) and large scale structure (LSS) datasets. Inflation solves the horizon and flatness problems and naturally generates density fluctuations that seed LSS and CMB anisotropies, and tensor perturbations (primordial gravitational waves). Inflation theory is based on a scalar field φ (the inflaton) whose potential is fairly flat, leading to a slow-roll evolution. This review focuses on the following new aspects of inflation. We present the effective theory of inflation à la Ginsburg and

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Drewes, Marco. "Measuring the inflaton coupling in the CMB." Journal of Cosmology and Astroparticle Physics 2022, no. 09 (2022): 069. http://dx.doi.org/10.1088/1475-7516/2022/09/069.

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Abstract We study the perspectives to extract information about the microphysical parameters that governed the reheating process after cosmic inflation from CMB data. We identify conditions under which the inflaton coupling to other fields can be constrained for a given model of inflation without having to specify the details of the particle physics theory within which this model is realised. This is possible when the effective potential during reheating is approximately parabolic, and when the coupling constants are smaller than an upper bound that is determined by the ratios between the infl

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Antoniadis, Ignatios. "Inflation from Supersymmetry Breaking." Universe 5, no. 1 (2019): 30. http://dx.doi.org/10.3390/universe5010030.

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I discuss the possibility that inflation is driven by supersymmetry breaking, with the superpartner of the goldstino (sgoldstino) playing the role of the inflaton. Imposing an R-symmetry to satisfy the slow-roll conditions, avoiding the so-called η -problem, leads to an interesting class of small field inflation models, characterised by an inflationary plateau around the maximum of scalar potential near the origin, where R-symmetry is restored with the inflaton rolling down to a minimum, describing the present phase of the Universe. Inflation can be driven by either an F- or a D-term, while th

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Stein, Nina K., and William H. Kinney. "Simple single-field inflation models with arbitrarily small tensor/scalar ratio." Journal of Cosmology and Astroparticle Physics 2023, no. 03 (2023): 027. http://dx.doi.org/10.1088/1475-7516/2023/03/027.

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Abstract We construct a family of simple single-field inflation models consistent with Planck / BICEP Keck bounds which have a parametrically small tensor amplitude and no running of the scalar spectral index. The construction consists of a constant-roll hilltop inflaton potential with the end of inflation left as a free parameter induced by higher-order operators which become dominant late in inflation. This construction directly demonstrates that there is no lower bound on the tensor/scalar ratio for simple single-field inflation models.

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Chowdhry, Bhagwan, Richard Roll, and Yihong Xia. "Extracting Inflation from Stock Returns to Test Purchasing Power Parity." American Economic Review 95, no. 1 (2005): 255–76. http://dx.doi.org/10.1257/0002828053828554.

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Relative purchasing power parity (PPP) holds for pure price inflations, which affect prices of all goods and services by the same proportion, while leaving relative prices unchanged. Pure price inflations also affect nominal returns of all traded financial assets by exactly the same amount. Recognizing that relative PPP may not hold for the official inflation data constructed from commodity price indices because of relative price changes and other frictions that cause prices to be “sticky,” we provide a novel method for extracting a proxy for realized pure price inflation from stock returns. W

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Qi, XinXin, and Hao Sun. "Inflation and dark matter in the Z ₅ model." Journal of Cosmology and Astroparticle Physics 2023, no. 05 (2023): 051. http://dx.doi.org/10.1088/1475-7516/2023/05/051.

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Abstract We discuss the possibility of unifying dark matter physics and inflation in the Z 5 model of the two-component dark matter. Inflation driven by the two-component dark matter fields can be divided into two cases, singlet dark matter inflation and mixed dark matter inflation, where both two-component play the role of inflaton in the latter case. For dark matter, we focus on the mixed dark matter inflation case. We show a viable parameter space that satisfies the theoretical and dark matter relic density constraint in the case of successful inflation. It turns out that the dark matter de

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BASTERO-GIL, MAR, and ARJUN BERERA. "WARM INFLATION MODEL BUILDING." International Journal of Modern Physics A 24, no. 12 (2009): 2207–40. http://dx.doi.org/10.1142/s0217751x09044206.

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We review the main aspects of the warm inflation scenario, focusing on the inflationary dynamics and the predictions related to the primordial spectrum of perturbations, to be compared with the recent cosmological observations. We study in detail three different classes of inflationary models, chaotic, hybrid models and hilltop models, and discuss their embedding into supersymmetric models and the consequences for model building of the warm inflationary dynamics based on first principles calculations. Due to the extra friction term introduced in the inflaton background evolution generated by t

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Wilkins, A., and A. Cable. "Spectators no more! How even unimportant fields can ruin your Primordial Black Hole model." Journal of Cosmology and Astroparticle Physics 2024, no. 02 (2024): 026. http://dx.doi.org/10.1088/1475-7516/2024/02/026.

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Abstract In this work we terminate inflation during a phase of Constant Roll by means of a waterfall field coupled to the inflaton and a spectator field. The presence of a spectator field means that inflation does not end at a single point, ϕ e, but instead has some uncertainty resulting in a stochastic end of inflation. We find that even modestly coupled spectator fields can drastically increase the abundance of Primordial Black Holes (PBHs) formed by many orders of magnitude. The power spectrum created by the inflaton can be as little as 10-4 during a phase of Ultra Slow-Roll and still form

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Sule, Sani Abdullahi, Lukman Hakim, Tetuko Rawidyo Putro, and Putra Pamungkas. "The Impact of Inflation on the Business Cycle and Economic Growth: An Empirical Analysis." International Journal on Economics, Finance and Sustainable Development 6, no. 11 (2024): 274–86. http://dx.doi.org/10.31149/ijefsd.v6i11.5334.

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This paper investigates the complex relationship between inflation, business cycles, and economic growth, focusing on both theoretical and empirical perspectives. The primary aim is to under-stand how inflation impacts key economic variables such as investment, consumption, employ-ment, and productivity and to identify effective policy responses. Specifically, the study’s objec-tives are to examine the mechanisms through which inflation affects the business cycle, quantify its impact on long-term economic growth, and evaluate policy strategies for managing inflation’s adverse effects. Methodol

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Pallis, Constantinos. "Starobinsky Inflation with T-Model Kähler Geometries." Universe 11, no. 3 (2025): 75. https://doi.org/10.3390/universe11030075.

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We present novel implementations of Starobisky-like inflation within supergravity adopting Kähler potentials for the inflaton which parameterizes hyperbolic geometries known from T-model inflation. The associated superpotentials are consistent with an R and a global or gauge U(1)X symmetries. The inflaton is represented by a gauge-singlet or non-singlet superfield and is accompanied by a gauge-singlet superfield successfully stabilized thanks to its compact contribution into the total Kähler potential. Keeping the Kähler manifold intact, a conveniently violated shift symmetry is introduced whi

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Muders, Thomas, Benjamin Hentze, Stefan Kreyer, et al. "Measurement of Electrical Impedance Tomography-Based Regional Ventilation Delay for Individualized Titration of End-Expiratory Pressure." Journal of Clinical Medicine 10, no. 13 (2021): 2933. http://dx.doi.org/10.3390/jcm10132933.

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Rationale: Individualized positive end-expiratory pressure (PEEP) titration might be beneficial in preventing tidal recruitment. To detect tidal recruitment by electrical impedance tomography (EIT), the time disparity between the regional ventilation curves (regional ventilation delay inhomogeneity [RVDI]) can be measured during controlled mechanical ventilation when applying a slow inflation of 12 mL/kg of body weight (BW). However, repeated large slow inflations may result in high end-inspiratory pressure (PEI), which might limit the clinical applicability of this method. We hypothesized tha

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Ema, Yohei, and Sarunas Verner. "Cosmological collider signatures of Higgs-R² inflation." Journal of Cosmology and Astroparticle Physics 2024, no. 04 (2024): 039. http://dx.doi.org/10.1088/1475-7516/2024/04/039.

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Abstract We study the cosmological collider signatures in the Higgs-R 2 inflation model. We consider two distinct types of signals: one originating from the inflaton coupling to Standard Model fermions and gauge bosons, and another arising from the isocurvature mode interaction with the inflaton. In the former case, we determine that the signal magnitude is likely too small for detection by upcoming probes, primarily due to suppression by both the Planck scale and slow-roll parameters. However, we provide a detailed computation of the signal which could be potentially applicable to various Hig

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Walsh, M. C., and W. A. Carlo. "Sustained inflation during HFOV improves pulmonary mechanics and oxygenation." Journal of Applied Physiology 65, no. 1 (1988): 368–72. http://dx.doi.org/10.1152/jappl.1988.65.1.368.

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Effective use of high-frequency oscillatory ventilation (HFOV) may require maintenance of adequate lung volume to optimize gas exchange. To determine the impact of inflation during HFOV, sustained inflation was applied at pressures of 5, 10, and 15 cmH2O above mean airway pressure for 3, 10, and 30 s to 15 intubated, paralyzed, anesthetized rabbits after saline lavage to induce surfactant deficiency. Arterial blood gases were recorded in all rabbits while static compliance, resistance, time constant, and changes in functional residual capacity were recorded using the interrupter technique and

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Juhro, Solikin M., and Bernard Njindan Iyke. "FORECASTING INDONESIAN INFLATION WITHIN AN INFLATION-TARGETING FRAMEWORK: DO LARGE-SCALE MODELS PAY OFF?" Buletin Ekonomi Moneter dan Perbankan 22, no. 4 (2019): 423–36. http://dx.doi.org/10.21098/bemp.v22i4.1235.

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We examine the usefulness of large-scale inflation forecasting models in Indonesiawithin an inflation-targeting framework. Using a dynamic model averaging approachto address three issues the policymaker faces when forecasting inflation, namely,parameter, predictor, and model uncertainties, we show that large-scale modelshave significant payoffs. Our in-sample forecasts suggest that 60% of 15 exogenouspredictors significantly forecast inflation, given a posterior inclusion probability cut-offof approximately 50%. We show that nearly 87% of the predictors can forecast inflationif we lower the cu

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Nautz, Dieter, and Juliane Scharff. "Inflation and Relative Price Variability in a Low Inflation Country: Empirical Evidence for Germany." German Economic Review 6, no. 4 (2005): 507–23. http://dx.doi.org/10.1111/j.1468-0475.2005.00144.x.

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Abstract The recent literature on the welfare cost of inflation emphasizes inflation’s effect on the variability of relative prices. Expected and unexpected inflation have both been proposed to increase relative price variability (RPV) and, thereby, to distort the information content of nominal prices. This paper presents new evidence on the impact of inflation on RPV in Germany. Our results indicate that the influence of expected inflation disappears if a credible monetary policy stabilizes inflationary expectations on a low level. Yet the significant impact of unexpected inflation suggests t

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Tomberg, Eemeli, and Hardi Veermäe. "Tachyonic preheating in plateau inflation." Journal of Cosmology and Astroparticle Physics 2021, no. 12 (2021): 035. http://dx.doi.org/10.1088/1475-7516/2021/12/035.

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Abstract Plateau inflation is an experimentally consistent framework in which the scale of inflation can be kept relatively low. Close to the edge of the plateau, scalar perturbations are subject to a strong tachyonic instability. Tachyonic preheating is realized when, after inflation, the oscillating inflaton repeatedly re-enters the plateau. We develop the analytic theory of this process and expand the linear approach by including backreaction between the coherent background and growing perturbations. For a family of plateau models, the analytic predictions are confronted with numerical esti

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PANCHAPAKESAN, N., and SHIV K. SETHI. "EXTENDED INFLATION WITH NONMINIMALLY COUPLED INFLATON FIELD." International Journal of Modern Physics A 07, no. 26 (1992): 6665–78. http://dx.doi.org/10.1142/s0217751x92003069.

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An extended inflation model, in which the inflaton field is nonminimally coupled to the gravity, is discussed. It is shown that the nucleation rate of bubbles, during a phase transition in the inflaton field, can increase as the transition proceeds for a wide range of parameters of the inflaton potential. The bounce action for three possible cases—the strong gravity regime, the thick-walled Coleman-De Luccia bubbles and the thin-walled bubbles—is evaluated. The resulting bubble distribution for all the cases is shown to be in conformity with cosmological constraints for ω<500.

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