Reheating in two-sector cosmology

Adshead, Peter; Ralegankar, Pranjal; Shelton, Jessie

doi:10.1007/jhep08(2019)151

Cited by 24 publications

(25 citation statements)

References 49 publications

(72 reference statements)

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“…Although the dark and visible sectors could be in equilibrium in the early Universe, this need not necessarily be the case and in the converse scenario there can potentially be significant temperature differences between the two sectors. Such temperature differences can arise due to asymmetric inflationary reheating of sectors [309,310,311]. Moreover, even in the case that the visible and dark sector are initially decoupled with similar temperatures, subsequently evolution can lead to temperature differences.…”

Section: Nonstandard Cosmology Beyond Heavy Particlesmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

194

140

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It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. While the abundance of light elements indicates that the Universe was radiation dominated during Big Bang Nucleosynthesis (BBN), there is scant evidence that the Universe was radiation dominated prior to BBN. It is therefore possible that the cosmological history was more complicated, with deviations from the standard radiation domination during the earliest epochs. Indeed, several interesting proposals regarding various topics such as the generation of dark matter, matter-antimatter asymmetry, gravitational waves, primordial black holes, or microhalos during a nonstandard expansion phase have been recently made. In this paper, we review various possible causes and consequences of deviations from radiation domination in the early Universe -taking place either before or after BBN -and the constraints on them, as they have been discussed in the literature during the recent years.

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Section: Nonstandard Cosmology Beyond Heavy Particlesmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

194

140

View full text Add to dashboard Cite

show abstract

“…Early departures from radiation domination are also generic consequences of theories that contain an internally thermalized hidden sector that is thermally decoupled from the Standard Model (SM). Such decoupled self-interacting hidden sectors are readily obtained from straight-forward inflationary scenarios [6][7][8][9][10], and can naturally provide a cosmological origin for the dark matter (DM) of our universe [6,[11][12][13], a possibility that becomes ever more compelling with the continued absence of direct detection signals to date. If the lightest state in the hidden sector is massive, then it can easily come to dominate the energy density of the universe after it becomes non-relativistic.…”

Section: Introductionmentioning

confidence: 99%

Cannibalism's lingering imprint on the matter power spectrum

Erickcek,

Ralegankar,

Shelton

2021

Preprint

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The early universe may have contained internally thermalized dark sectors that were decoupled from the Standard Model. In such scenarios, the relic dark thermal bath, composed of the lightest particle in the dark sector, can give rise to an epoch of early matter domination prior to Big Bang Nucleosynthesis, which has a potentially observable impact on the smallest dark matter structures. This lightest dark particle can easily and generically have number-changing self-interactions that give rise to "cannibal" behavior. We consider cosmologies where an initially sub-dominant cannibal species comes to temporarily drive the expansion of the universe, and we provide a simple map between the particle properties of the cannibal species and the key features of the enhanced dark matter perturbation growth in such cosmologies. We further demonstrate that cannibal self-interactions can determine the small-scale cutoff in the matter power spectrum even when the cannibal self-interactions freeze out prior to cannibal domination.

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“…Thermal cosmological production is also reduced in this regime and the dark vectors might never develop a full thermal abundance. Even so, dark vector bosons can still be created in the early universe through direct reheating [75][76][77][78], freeze-in processes [79][80][81][82][83], or the decays or annihilations of heavier dark states [84,85]. The later decays of the vector bosons then inject energy into the cosmological medium, possibly modifying the light element abundances and the CMB relative to SM+ΛCDM [86,87].…”

Section: Introductionmentioning

confidence: 99%

Cosmological bounds on sub-GeV dark vector bosons from electromagnetic energy injection

Coffey

Forestell

Morrissey

et al. 2020

J. High Energ. Phys.

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New dark vector bosons that couple very feebly to regular matter can be created in the early universe and decay after the onset of big bang nucleosynthesis (BBN) or the formation of the cosmic microwave background (CMB) at recombination. The energy injected by such decays can alter the light element abundances or modify the power and frequency spectra of the CMB. In this work we study the constraints implied by these effects on a range of sub-GeV dark vectors including the kinetically mixed dark photon, and the B − L, Le− Lμ, Le− Lτ , and Lμ− Lτ dark U(1) bosons. We focus on the effects of electromagnetic energy injection, and we update previous investigations of dark photon and other dark vector decays by taking into account non-universality in the photon cascade spectrum relevant for BBN and the energy dependence of the ionization efficiency after recombination in our treatment of modifications to the CMB.

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Reheating in two-sector cosmology

Cited by 24 publications

References 49 publications

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Cannibalism's lingering imprint on the matter power spectrum

Cosmological bounds on sub-GeV dark vector bosons from electromagnetic energy injection

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