WIMPs, FIMPs, and Inflaton phenomenology via reheating, CMB and ∆Neff

Haque, MD Riajul; Maity, Debaprasad; Mondal, Rajesh

doi:10.1007/jhep09(2023)012

Cited by 20 publications

(2 citation statements)

References 125 publications

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“…In particular, in this study, we investigate scenarios of bosonic and fermionic reheating, where the inflaton decays dominant into pairs of bosons or fermions. Such cosmological histories have been recently considered in the context of DM freeze-in with (non-)renormalizable operators [20,21,[32][33][34][35][36][37], WIMPs [38], in the singlet-scalar DM model [39], CMB constraints on DM production [40][41][42][43], and freeze-in Baryogenesis [44].…”

Section: Jcap01(2024)053mentioning

confidence: 99%

Confronting dark matter freeze-in during reheating with constraints from inflation

Becker,

Copello,

Harz

et al. 2024

J. Cosmol. Astropart. Phys.

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We investigate the production of particle Dark Matter (DM) in a minimal freeze-in model considering a non-instantaneous reheating phase after inflation. We demonstrate that for low reheating temperatures, bosonic or fermionic reheating from monomial potentials can lead to a different evolution in the DM production and hence to distinct predictions for the parent particle lifetime and mass, constrained by long-lived particle (LLP) searches. We highlight that such scenario predicts parent particle decay lengths larger compared to using the instantaneous reheating approximation. Moreover, we demonstrate the importance of an accurate definition of the reheating temperature and emphasize its relevance for the correct interpretation of experimental constraints. We explore different models of inflation, which can lead to the considered reheating potential. We find that the extent to which the standard DM freeze-in production can be modified crucially depends on the underlying inflationary model. Based on the latest CMB constraints, we derive lower limits on the decay length of the parent particle and confront these results with the corresponding reach of LLP searches. Our findings underscore the impact of the specific dynamics of inflation on DM freeze-in production and highlight their importance for the interpretation of collider signatures. At the same time, our results indicate the potential for LLP searches to shed light on the underlying dynamics of reheating.

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Section: Jcap01(2024)053mentioning

confidence: 99%

Confronting dark matter freeze-in during reheating with constraints from inflation

Becker,

Copello,

Harz

et al. 2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…[67][68][69], through the s-channel exchange of massless gravitons in, e.g., refs. [31,[70][71][72][73][74][75][76][77][78][79][80], while DM is sourced from the decay of the inflaton in refs. [81][82][83][84].…”

Section: Jcap05(2024)072mentioning

confidence: 99%

Rescuing gravitational-reheating in chaotic inflation

Barman,

Bernal,

Rubio

2024

J. Cosmol. Astropart. Phys.

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We show, within the single-field inflationary paradigm, that a linear non-minimal interaction ξ M P ϕ R between the inflaton field ϕ and the Ricci scalar R can result in successful inflation that concludes with an efficient heating of the Universe via perturbative decays of the inflaton, aided entirely by gravity. Considering the inflaton field to oscillate in a quadratic potential, we find that 𝒪(10-1) ≲ 𝒪 ≲ 𝒪(102) is required to satisfy the observational bounds from Cosmic Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN). Interestingly, the upper bound on the non-minimal coupling guarantees a tensor-to-scalar ratio r ≳ 10-4, within the range of current and future planned experiments. We also discuss implications of dark matter production, along with the potential generation of the matter-antimatter asymmetry resulting from inflaton decay, through the same gravity portal.

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Squeezing, chaos and thermalization in periodically driven quantum systems: the case of bosonic preheating

Chakraborty,

Maity

2024

J. High Energ. Phys.

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The phenomena of Squeezing and chaos have recently been studied in the context of inflation. We apply this formalism in the post-inflationary preheating phase. During this phase, the inflaton field undergoes quasi-periodic oscillation, which acts as a driving force for the resonant growth of quantum fluctuation or particle production. Furthermore, the quantum state of the fluctuations is known to have evolved into a squeezed state. In this submission, we explore the underlying connection between the resonant growth, squeezing, and chaos by computing the Out of Time Order Correlator (OTOC) of phase space variables and establishing a relation among the Lyapunov, Floquet exponents, and squeezing parameters. For our study, we consider observationally favored α-attractor E-model of inflaton coupled with the bosonic field. After the production, the system of produced bosonic fluctuations/particles from the inflaton is supposed to thermalize, and that is believed to have an intriguing connection to the nature of chaos of the system under perturbation. We conjecture a relation between the thermalization temperature ($$ {\overline{T}}_{\textrm{SS}} $$ T ¯ SS ) of the system and quantum squeezing, which is further shown to be consistent with the well-known Rayleigh-Jeans formula for the temperature symbolized as $$ {\overline{T}}_{\textrm{RJ}} $$ T ¯ RJ , and that is $$ {\overline{T}}_{\textrm{SS}}\simeq {\overline{T}}_{\textrm{RJ}} $$ T ¯ SS ≃ T ¯ RJ . Finally, we show that the system temperature is in accord with the well-known lower bound on the temperature of a chaotic system proposed by Maldacena-Shenker-Stanford (MSS).

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WIMPs, FIMPs, and Inflaton phenomenology via reheating, CMB and ∆Neff

Cited by 20 publications

References 125 publications

Confronting dark matter freeze-in during reheating with constraints from inflation

Confronting dark matter freeze-in during reheating with constraints from inflation

Rescuing gravitational-reheating in chaotic inflation

Squeezing, chaos and thermalization in periodically driven quantum systems: the case of bosonic preheating

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