Dark Matter from freeze-in and its inhomogeneities

Струмиа, Алессандро

doi:10.1007/jhep03(2023)042

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…given that the energy transfer is a function of the radiation density Q(ρ r ), such that δQ = (dQ/dτ )/(dρ r /dτ ) × δρ r during freeze-in. This argument has been presented in [86,89]. Yet, in the KS formalism, source terms proportional to the adiabatic perturbation ∆ remain, yielding nonzero, scale-dependent contributions to isocurvature on super-horizon scales.…”

Section: Jcap11(2023)024mentioning

confidence: 85%

Impact of freeze-in on dark matter isocurvature

Bellomo,

Berghaus,

Boddy

2023

J. Cosmol. Astropart. Phys.

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Dark matter freeze-in is a compelling cosmological production mechanism in which all or some of the observed abundance of dark matter is generated through feeble interactions it has with the Standard Model. In this work we present the first analysis of freeze-in dark matter fluctuations and consider two benchmark models: freeze-in through the direct decay of a heavy vector boson and freeze-in through pair annihilation of Standard Model particles in the thermal bath. We provide a theoretical framework for determining the impact of freeze-in on curvature and dark matter isocurvature perturbations. We determine freeze-in dark matter fluid properties from first principles, tracking its evolution from its relativistic production to its final cold state, and calculate the evolution of the dark matter isocurvature perturbation. We find that in the absence of initial isocurvature, the freeze-in production of dark matter does not source isocurvature. However, for an initial isocurvature perturbation seeded by inflation, the nonthermal freeze-in process may allow for a fraction of the isocurvature to persist, in contrast to the exponential suppression it receives in the case of thermal dark matter. In either case, the evolution of the curvature mode is unaffected by the freeze-in process. We show sensitivity projections of future cosmic microwave background experiments to the amplitude of uncorrelated, totally anticorrelated, and totally correlated dark matter isocurvature perturbations. From these projections, we infer the sensitivity to the abundance of freeze-in dark matter that sustains some fraction of the primordial isocurvature.

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Section: Jcap11(2023)024mentioning

confidence: 85%

Impact of freeze-in on dark matter isocurvature

Bellomo,

Berghaus,

Boddy

2023

J. Cosmol. Astropart. Phys.

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Dark matter isocurvature from curvature

Holst,

Hu,

Jenks

2024

Phys. Rev. D

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Dark Matter Production during Warm Inflation via Freeze-In

Freese,

Montefalcone,

Haghi

2024

Phys. Rev. Lett.

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We present a novel perspective on the role of inflation in the production of dark matter (DM). Specifically, we explore the DM production during warm inflation via ultraviolet freeze-in (WIFI). We demonstrate that in a warm inflation (WI) setting the persistent thermal bath, sustained by the dissipative interactions with the inflaton field, can source a sizable DM abundance via the nonrenormalizable interactions that connect the DM with the bath. Compared to the (conventional) radiation-dominated (RD) UV freeze-in scenario for the same reheat temperature (after inflation), the resulting DM yield in WIFI is always enhanced showing a strongly positive dependence on the mass dimension of the nonrenormalizable operator. Of particular interest, for a sufficiently large mass dimension of the operator, the entirety of the DM abundance of the Universe can be created during the inflationary phase. For the specific models we study, we find that the enhancement in DM yield, relative to RD UV freeze-in, is at least an order of magnitude for an operator of mass dimension 5, and as large as 18 orders of magnitude for an operator of mass dimension 10. Our findings also suggest a broader applicability for producing other cosmological relics, which may have a substantial impact on the evolution of the early Universe. Published by the American Physical Society 2024

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Dark Matter from freeze-in and its inhomogeneities

Cited by 3 publications

References 19 publications

Impact of freeze-in on dark matter isocurvature

Impact of freeze-in on dark matter isocurvature

Dark matter isocurvature from curvature

Dark Matter Production during Warm Inflation via Freeze-In

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