Dark matter abundance from the sequential freeze-in mechanism

Bélanger, G.; Delaunay, Cédric; Pukhov, A.; Zaldívar, Bryan

doi:10.1103/physrevd.102.035017

Cited by 28 publications

(23 citation statements)

References 72 publications

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“…The integral can be computed analytically if we set g * g * s const so that the number of relativistic degrees of freedom do not vary during the DM production era (see refs. [23,108] for relaxing this assumption). We set them at the time when freeze-in is mostly efficient, namely when T m B (x 1), and we find…”

Section: Jhep05(2021)234mentioning

confidence: 99%

Displaced new physics at colliders and the early universe before its first second

DʼEramo

Junius

Lopez-Honorez

et al. 2021

J. High Energ. Phys.

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Displaced vertices at colliders, arising from the production and decay of long-lived particles, probe dark matter candidates produced via freeze-in. If one assumes a standard cosmological history, these decays happen inside the detector only if the dark matter is very light because of the relic density constraint. Here, we argue how displaced events could very well point to freeze-in within a non-standard early universe history. Focusing on the cosmology of inflationary reheating, we explore the interplay between the reheating temperature and collider signatures for minimal freeze-in scenarios. Observing displaced events at the LHC would allow to set an upper bound on the reheating temperature and, in general, to gather indirect information on the early history of the universe.

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Section: Jhep05(2021)234mentioning

confidence: 99%

Displaced new physics at colliders and the early universe before its first second

DʼEramo

Junius

Lopez-Honorez

et al. 2021

J. High Energ. Phys.

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“…When φ is in the chemical equilibrium with the SM plasma the semi-production mechanism leads to the enhanced values of the coupling compared to the typical freeze-in, but as illustrated in section 2, the resulting cross sections are still somewhat below the sensitivity of the near-future indirect searches. However, combined with the idea of the sequential freeze-in [30], i.e. simply when φ is coupled very weakly to the SM states such that it also undergoes the freeze-in, the resulting signals can be much stronger.…”

Section: Scan Results and Phenomenologymentioning

confidence: 99%

“…, since the dark sector is never populated densely enough for the backreaction processes, nor for the actual momentum distribution of DM, to have any impact. Therefore, only the 0-th moment of the equation (4.1) is usually considered (but see [30] for an exception). In the case of semi-production, however, χ is also present in the initial state, leading to a dependence of the production rate on its distribution function.…”

Section: Boltzmann Equationsmentioning

confidence: 99%

Dark matter freeze-in from semi-production

Hryczuk

Laletin

2021

J. High Energ. Phys.

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We study a novel dark matter production mechanism based on the freeze-in through semi-production, i.e. the inverse semi-annihilation processes. A peculiar feature of this scenario is that the production rate is suppressed by a small initial abundance of dark matter and consequently creating the observed abundance requires much larger coupling values than for the usual freeze-in. We provide a concrete example model exhibiting such production mechanism and study it in detail, extending the standard formalism to include the evolution of dark matter temperature alongside its number density and discuss the importance of this improved treatment. Finally, we confront the relic density constraint with the limits and prospects for the dark matter indirect detection searches. We show that, even if it was never in full thermal equilibrium in the early Universe, dark matter could, nevertheless, have strong enough present-day annihilation cross section to lead to observable signals.

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“…We will also neglect spin statistics effects by taking (1 ± f out ) = 1, see e.g. [30,31,33] for some complementary studies.…”

Section: Boltzmann Equationsmentioning

confidence: 99%

Lyman-$α$ constraints on freeze-in and superWIMPs

Decant,

Heisig,

Hooper

et al. 2021

Preprint

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Dark matter (DM) from freeze-in or superWIMP production is well known to imprint non-cold DM signatures on cosmological observables. We derive constraints from Lyman-α forest observations for both cases, basing ourselves on a reinterpretation of the existing Lyman-α limits on thermal warm DM. We exclude DM masses below 15 keV for freeze-in, in good agreement with previous literature, and provide a generic lower mass bound for superWIMPs that depends on the mother particle decay width. Special emphasis is placed on the mixed scenario, where contributions from both freeze-in and superWIMP are similarly important. In this case, the imprint on cosmological observables can deviate significantly from thermal warm DM. Furthermore, we provide a modified version of the Boltzmann code class, analytic expressions for the DM distributions, and fits to the DM transfer functions that account for both mechanisms of production. Moreover, we also derive generic constraints from ∆N eff measurements and show that they cannot compete with those arising from Lyman-α observations. For illustration, we apply the above generic limits to a coloured t-channel mediator DM model, in which case contributions from both freeze-in through scatterings and decays, as well as superWIMP production can be important. We map out the entire cosmologically viable parameter space, cornered by bounds from Lyman-α observations, the LHC, and Big Bang Nucleosynthesis.

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Dark matter abundance from the sequential freeze-in mechanism

Cited by 28 publications

References 72 publications

Displaced new physics at colliders and the early universe before its first second

Displaced new physics at colliders and the early universe before its first second

Dark matter freeze-in from semi-production

Lyman-$α$ constraints on freeze-in and superWIMPs

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