Imprint of a scalar era on the primordial spectrum of gravitational waves

DʼEramo, Francesco; Schmitz, Kai

doi:10.1103/physrevresearch.1.013010

Cited by 65 publications

(58 citation statements)

References 169 publications

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“…Refs. [967,946,947,968]. Unfortunately, given the current upper bound on the scale of inflation, only futuristic experiments like BBO or DECIGO [969,970,971] may have a chance to measure the inflationary GW background today, as its amplitude is very suppressed, c.f.…”

Section: Inflationmentioning

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: Inflationmentioning

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

“…refs. [97][98][99][100][101][102], but at the moment we have no information about the pre-BBN universe. The detection of displaced events at colliders with missing energy in the final state can provide hints about both these open questions.…”

Section: Jhep05(2021)234mentioning

confidence: 99%

Displaced new physics at colliders and the early universe before its first second

DʼEramo

Junius

Lopez-Honorez

et al. 2021

J. High Energ. Phys.

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Displaced vertices at colliders, arising from the production and decay of long-lived particles, probe dark matter candidates produced via freeze-in. If one assumes a standard cosmological history, these decays happen inside the detector only if the dark matter is very light because of the relic density constraint. Here, we argue how displaced events could very well point to freeze-in within a non-standard early universe history. Focusing on the cosmology of inflationary reheating, we explore the interplay between the reheating temperature and collider signatures for minimal freeze-in scenarios. Observing displaced events at the LHC would allow to set an upper bound on the reheating temperature and, in general, to gather indirect information on the early history of the universe.

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“…where H = a −1 d dτ a, c s is the acoustic velocity approximately equal √ w and p = wρ where p is the pressure and ρ is the density in the energy-momentum tensor on the rhs of Einstein equations. The effect of the decay of the inflanton at the end of the inflation era could be described by a modification of Equation ( 33) by a friction term γ∂ τ Φ [52]. We assume that either γ is negligible or Equation (33) describes the evolution of the scalar perturbation after the decay of the inflaton.…”

Section: Scalar Acoustic Environmentmentioning

confidence: 99%

Quantum State Evolution in an Environment of Cosmological Perturbations

Haba¹

2021

Universe

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We study the pure and thermal states of quantized scalar and tensor perturbations in various epochs of Universe evolution. We calculate the density matrix of non-relativistic particles in an environment of these perturbations. We show that particle’s motion can be described by a stochastic equation with a noise coming from the cosmological environment. We investigate the squeezing of Gaussian wave packets in different epochs and its impact on the noise of quantized cosmological perturbations.

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Imprint of a scalar era on the primordial spectrum of gravitational waves

Cited by 65 publications

References 169 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

Displaced new physics at colliders and the early universe before its first second

Quantum State Evolution in an Environment of Cosmological Perturbations

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