Chemical-potential-assisted particle production in FRW spacetimes

Sou, Chon Man; Tong, Xi; Wang, Yi

doi:10.1007/jhep06(2021)129

Cited by 37 publications

(35 citation statements)

References 73 publications

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“…Bosonic particles are straightforward, and the same method is available. For fermions, one is able to apply the superadiabatic basis for two level quantum mechanical system [53,54], which is recently applied to the fermionic particle production in [14,55,56]. Since standard model mostly consists of fermions, such an analysis would be necessary for realistic cosmological models.…”

Section: Discussionmentioning

confidence: 99%

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Superadiabatic basis in cosmological particle production: application to preheating

Yamada

2021

Preprint

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We discuss the adiabatic basis dependence of particle number in time-dependent backgrounds. In particular, we focus on preheating after inflation, and show that, for the optimal basis, the time dependence of the produced particle number can be well approximated by a simple connection formula, which can be obtained by analysing Stokes phenomenon in given backgrounds. As we show explicitly, the simple connection formula can describe various parameter regions such as narrow and broad resonance regime in a unified manner.

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Section: Discussionmentioning

confidence: 99%

“…[39]). 14 On the other hand, in the broad resonance regime, produced particle number is expressed in terms of non-analytic functions of a coupling constant λ as it can be understood from the simplified model in Sec. 4.1.…”

Section: Narrow and Broad Resonance Regime In The Oscillating Scalar ...mentioning

confidence: 99%

Superadiabatic basis in cosmological particle production: application to preheating

Yamada

2021

Preprint

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“…Yet the mathematical complexity of special functions may conceal the physics inside. Alternatively, a more physical approach is to use the super-adiabatic approximation based on the Stokes-line method [54]. Consider the equation of motion of a canonically normalized massive field with mode function v k I (τ ),…”

Section: Bulk Evolution As Resonance Eventsmentioning

confidence: 99%

“…BSM models such as supersymmetry [4], extra dimension [21] and monodromy [53] give robust predictions at the CC. In search of a large CC signal, CP-violating dimension-5 operators that act as an external chemical potential can assist gravitational production by alleviating the effective mass [19,25,28,29,33,36,54], while a warm inflationary background can provide abundant massive particles from the furnace in the UV [55][56][57]. As a channel alternative to curvature perturbations, isocurvature colliders also encode the CC signals via modulated reheating [24,27,41].…”

Section: Introductionmentioning

confidence: 99%

Cutting Rule for Cosmological Collider Signals: A Bulk Evolution Perspective

Tong,

Wang,

Zhu

2021

Preprint

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A: We show that the evolution of interacting massive particles in the de Sitter bulk can be understood at leading order as a series of resonant decay and production events. From this perspective, we classify the cosmological collider signals into local and nonlocal categories with drastically different physical origins. This further allows us to derive a cutting rule for efficiently extracting these cosmological collider signals in an analytical fashion. Our cutting rule is a practical way for extracting cosmological collider signals in model building, and can be readily implemented as symbolic computational packages in the future.

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“…A relatively recent example of this is the "Cosmological Collider Physics" program [6,7] that aims to detect on-shell mass-spin signatures of heavy particles via non-analytic momentum dependence and angular dependence of cosmological correlators. In particular, it has been shown recently [8][9][10][11][12] that particle masses m φ0 , where φ0 ≈ 60H * [2] is the slowly rolling inflaton velocity, can give rise to distinctive oscillatory signatures in primordial non-Gaussianity. For high-scale inflation, such a scale ∼ 60H * is interesting from a particle physics point of view since it can be close to the scale of Grand Unification.…”

Section: Introductionmentioning

confidence: 99%

Cosmological particle production and pairwise hotspots on the CMB

Kim

Kumar

Martin

et al. 2021

J. High Energ. Phys.

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Heavy particles with masses much bigger than the inflationary Hubble scale H*, can get non-adiabatically pair produced during inflation through their couplings to the inflaton. If such couplings give rise to time-dependent masses for the heavy particles, then following their production, the heavy particles modify the curvature perturbation around their locations in a time-dependent and scale non-invariant manner. This results into a non-trivial spatial profile of the curvature perturbation that is preserved on superhorizon scales and eventually generates localized hot or cold spots on the CMB. We explore this phenomenon by studying the inflationary production of heavy scalars and derive the final temperature profile of the spots on the CMB by taking into account the subhorizon evolution, focusing in particular on the parameter space where pairwise hot spots (PHS) arise. When the heavy scalar has an $$ \mathcal{O} $$ O (1) coupling to the inflaton, we show that for an idealized situation where the dominant background to the PHS signal comes from the standard CMB fluctuations themselves, a simple position space search based on applying a temperature cut, can be sensitive to heavy particle masses M0/H* ∼ $$ \mathcal{O} $$ O (100). The corresponding PHS signal also modifies the CMB power spectra and bispectra, although the corrections are below (outside) the sensitivity of current measurements (searches).

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Chemical-potential-assisted particle production in FRW spacetimes

Cited by 37 publications

References 73 publications

Superadiabatic basis in cosmological particle production: application to preheating

Superadiabatic basis in cosmological particle production: application to preheating

Cutting Rule for Cosmological Collider Signals: A Bulk Evolution Perspective

Cosmological particle production and pairwise hotspots on the CMB

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