Imprints of Schwinger effect on primordial spectra

Self Cite

We study the gravitational production of super-Hubble-mass dark matter in the very early universe. We first review the simplest scenario where dark matter is produced mainly during slow roll inflation. Then we move on to consider the cases where dark matter is produced during the transition period between inflation and the subsequent cosmological evolution. The limits of smooth and sudden transitions are studied, respectively. The relic abundances and the cosmological collider signals are calculated.

Section: Dark Matter On the Cosmological Collidermentioning

confidence: 99%

Gravitational production of superheavy dark matter and associated cosmological signatures

Nakama

Sou

et al. 2019

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“…by the composite operators developing a condensate, and thus are a result of a dynamical symmetry-breaking mechanism in de Sitter space. Vector field perturbations in de Sitter inflationary setting can affect inflationary observables [32,33] and the dynamics of the standard model during inflation [34], which may have observable ramifications, thus warranting a closer investigation.…”

Section: Jhep09(2020)165mentioning

confidence: 99%

Abelian Higgs model in power-law inflation: the propagators in the unitary gauge

Glavan

Marunović²,

Prokopec

et al. 2020

We consider the Abelian Higgs model in the broken phase as a spectator in cosmological spaces of general D space-time dimensions, and allow for the condensate to be time-dependent. We fix the unitary gauge using Dirac’s formalism for constrained systems, and then quantize the gauge-fixed system. Vector and scalar perturbations develop timedependent masses. We work out their propagators assuming the cosmological background is that of power-law inflation, characterized by a constant principal slow-roll parameter, and that the scalar condensate is in the attractor regime, scaling as the Hubble rate. Our propagators correctly reduce to known results in the Minkowski and de Sitter space limits. We use the vector propagator to compute the equal-time correlators of electric and magnetic fields and find that at super-Rubble separations the former is enhanced, while the latter is suppressed compared to the vacuum fluctuations of the massless vector field. These correlators satisfy the hierarchy governed by Faraday’s law.

“…Additionally, the subscript (2) denotes the number of interaction vertices. This type of integral in the squeezed limit k 1 k 2 k 3 is well-known [17,50,53,60,103] and the details are collected in appendix. A. Eq.…”

Section: Bispectrummentioning

confidence: 95%

Cosmological signatures of superheavy dark matter

Wang

et al. 2020

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We discuss two possible scenarios, namely the curvaton mechanism and the dark matter density modulation, where non-Gaussianity signals of superheavy dark matter produced by gravity can be enhanced and observed. In both scenarios, superheavy dark matter couples to an additional light field as a mediator. In the case of derivative coupling, the resulting non-Gaussianities induced by the light field can be large, which can provide inflationary evidences for these superheavy dark matter scenarios.