Implications of time-dependent inflaton decay on reheating and dark matter production

Ahmed, Aqeel; Grzadkowski, Bohdan; Socha, Anna

doi:10.48550/arxiv.2111.06065

Cited by 5 publications

(11 citation statements)

References 36 publications

(61 reference statements)

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“…It turns out that in this case, the inflaton decay rate, Γ φ becomes a function of time [12]. Such time-dependence of Γ φ can be generated by the inflaton-induced mass of the Higgs doublet [12], and the non-standard form of the inflaton potential [11,12]. It turns out that it has non-trivial consequences for the dynamics of the reheating period in both cases.…”

Section: Introductionmentioning

confidence: 95%

“…Moreover, we assume that the leading interaction of the inflaton with the Standard Model (SM) sector is through the Higgs portal φ|H| 2 . Not only does this operator describe the perturbative decay of the φ field into the pairs of the SM Higgs particles, but it also generates a φ-dependent mass and a vacuum-expectation-value (vev) of the Higgs doublet [12]. It turns out that in this case, the inflaton decay rate, Γ φ becomes a function of time [12].…”

Section: Introductionmentioning

confidence: 99%

“…Not only does this operator describe the perturbative decay of the φ field into the pairs of the SM Higgs particles, but it also generates a φ-dependent mass and a vacuum-expectation-value (vev) of the Higgs doublet [12]. It turns out that in this case, the inflaton decay rate, Γ φ becomes a function of time [12]. Such time-dependence of Γ φ can be generated by the inflaton-induced mass of the Higgs doublet [12], and the non-standard form of the inflaton potential [11,12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Higgs Boson-Induced Reheating and Dark Matter Production

2022

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We discuss a perturbative and non-instantaneous reheating model, adopting a generic post-inflationary scenario with an equation of state w. In particular, we explore the Higgs boson-induced reheating, assuming that it is achieved through a cubic inflaton-Higgs coupling ϕ|H|2. In the presence of such coupling, the Higgs doublet acquires a ϕ-dependent mass and a non-trivial vacuum–expectation–value that oscillates in time and breaks the Standard Model gauge symmetry. Furthermore, we demonstrate that the non-standard cosmologies and the inflaton-induced mass of the Higgs field modify the radiation production during the reheating period.This, in turn, affects the evolution of a thermal bath temperature, which has remarkable consequences for the ultraviolet freeze-in dark matter production.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Higgs Boson-Induced Reheating and Dark Matter Production

2022

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“…Although particle production via parametric resonance is typically much more efficient than the perturbative particle production, the latter still determines whether the dissipation of inflaton is complete or not as well as some initial conditions right after reheating. This work also serves as a first-principle, and perhaps also more rigorous than alternative methods, foundation for studying perturbative production of Dark Matter from an oscillating inflaton [48][49][50][51][52]. 5 The outline of the paper is as follows.…”

Section: Introductionmentioning

confidence: 99%

Dissipation of oscillating scalar backgrounds in an FLRW universe

Wang¹,

Ai²

2022

Preprint

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We study particle production from oscillating scalar backgrounds in a spatially flat Friedmann-Lemaître-Robertson-Walker universe using non-equilibrium quantum field theory which fully captures the thermal effects and backreaction effects. To be concrete, we consider a Z 2 -symmetric two-scalar model with quartic interactions. For quasi-harmonic oscillations, we adopt the multi-scale analysis to obtain analytical approximate expressions for the self-consistent evolution of the scalar background and the energy density of the produced particles in terms of the retarded self-energy and retarded proper four-vertex function, whose imaginary parts characterize different condensate decay channels and lead to dissipation. We find that reheating in this model can be complete if the imaginary part of the retarded self-energy is non-vanishing, which causes dissipation only at finite temperature through Landau damping. Our results can be generalized to more complicated models and thus could provide a general framework for studying the perturbative reheating process in the early Universe or perturbative production of Dark Matter from an oscillating inflaton.

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“…Recently there has been significant studies on implications of the reheating dynamics on the production of DM, see e.g. [29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet freeze-in dark matter through the dilaton portal

Ahmed¹,

Najjari²

2021

Preprint

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We consider a class of models where the Standard Model (SM) and dark matter (DM) belong to a conformal/scale-invariant theory at high energies. The scale invariance is broken spontaneously at scale f , and the corresponding Goldstone boson is the dilaton. In the low-energy theory, we assume DM interacts with the SM only through the dilaton portal suppressed by the conformal breaking scale f . Assuming f TeV, the portal interactions are very feeble, and hence the DM is not in thermal equilibrium with the SM bath. Therefore, ultraviolet freeze-in production of DM is realized through the dilaton portal, which is most effective at the maximum temperature of the SM bath. The temperature evolution critically depends on the reheating dynamics, which we parameterize by a general equation of state w and temperature at the end of reheating T rh . Implications of the reheating dynamics are studied for DM production in this framework. We have identified regions of parameter space that lead to the observed DM relic abundance for a wide range of DM masses and reheating temperatures for a scalar, vector, or fermion DM.

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Implications of time-dependent inflaton decay on reheating and dark matter production

Cited by 5 publications

References 36 publications

Higgs Boson-Induced Reheating and Dark Matter Production

Higgs Boson-Induced Reheating and Dark Matter Production

Dissipation of oscillating scalar backgrounds in an FLRW universe

Ultraviolet freeze-in dark matter through the dilaton portal

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