Opening the reheating box in multifield inflation

Martin, Jerome; Pinol, Lucas

doi:10.48550/arxiv.2105.03301

Cited by 3 publications

(2 citation statements)

References 75 publications

(134 reference statements)

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“…1), we assume 50 N * 70 for our model. The theoretical uncertainty of N * mainly comes from the modeling of the reheating process [46][47][48]. In Sec.…”

Section: B Linear Perturbationsmentioning

confidence: 99%

Cosmological consequences of a scalar field with oscillating equation of state. II. Oscillating scaling and chaotic accelerating solutions

Tian

2020

Phys. Rev. D

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We investigate the inflationary consequences of the oscillating dark energy model proposed by Tián [Phys. Rev. D 101, 063531 (2020)], which aims to solve the cosmological coincidence problem with multi-accelerating Universe (MAU). We point out that the inflationary dynamics belong to slow-roll inflation. The spectral index of scalar perturbations and the tensor-to-scalar ratio r are shown to be consistent with current Planck measurements. Especially, this model predicts r ∼ 10 −7 , which is far below the observation limits. This result motivates us to explore the smallness of r in the general MAU. We propose a quintessential generalization of the original model and prove r < 0.01 in general. The null detection to date of primordial gravitational waves provides a circumstantial evidence for the MAU. After the end of inflation, the scalar field rolls toward infinity instead of a local minimum, and meanwhile its equation of state is oscillating with an average value larger than 1/3. In this framework, we show that gravitational particle creation at the end of inflation is capable of reheating the Universe.

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“…1), we assume 50 N * 70 for our model. The theoretical uncertainty of N * mainly comes from the modeling of the reheating process [46][47][48]. In Sec.…”

Section: B Linear Perturbationsmentioning

confidence: 99%

Cosmological consequences of a scalar field with oscillating equation of state. II. Oscillating scaling and chaotic accelerating solutions

Tian

2020

Phys. Rev. D

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“…This involves the knowledge of how photons, cold dark matter, baryons and neutrinos are produced from the decay of the different microscopic degrees of freedom. This study has been recently carried out in flat field spaces [18] but the extension of this formalism to curved systems is still missing. • There are some particular cases where however the relative entropy variable S ij becomes illdefined since it would apparently diverge.…”

Section: Introductionmentioning

confidence: 99%

On the choice of entropy variables in multifield inflation

Cicoli¹,

Guidetti²,

Muia³

et al. 2022

Class. Quantum Grav.

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We discuss the usefulness and theoretical consistency of different entropy variables used in the literature to describe isocurvature perturbations in multifield inflationary models with a generic curved field space. We clarify which is the proper entropy variable to be used to match the evolution of isocurvature modes during inflation to the one after the reheating epoch in order to compare with observational constraints. In particular, we find that commonly used variables, as the relative entropy perturbation or the one associated to the decomposition in tangent and normal perturbations with respect to the inflationary trajectory, even if more useful to perform numerical studies, can lead to results which are wrong by several orders of magnitude, or even to apparent destabilisation effects which are unphysical for cases with light kinetically coupled spectator fields.

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