Thermal keV dark matter in a gauged B-L model with cosmic inflation

Borah, Debasish; Jyoti, Das, Suruj; Saha, A.

doi:10.48550/arxiv.2110.13927

Cited by 3 publications

(3 citation statements)

References 60 publications

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“…(2.4), which assumes an instantaneous decay. D follows the Casas Ibarra parametrisation [24,60,61]. The required decay rate can be realised by choosing tiny Dirac Yukawa couplings which in turn predicts vanishingly small lightest active neutrino mass (shown in [24]).…”

Section: Jcap03(2024)031mentioning

confidence: 99%

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Borah,

Das,

Samanta

2024

J. Cosmol. Astropart. Phys.

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Motivated by the recent release of new results from five different pulsar timing array (PTA) experiments claiming to have found compelling evidence for primordial gravitational waves (GW) at nano-Hz frequencies, we consider the prospects of generating such a signal from inflationary blue-tilted tensor power spectrum in a specific dark matter (DM) scenario dubbed as Miracle-less WIMP. While Miracle-less WIMP, due to insufficient interaction rate with the Standard Model (SM) bath gets thermally overproduced, inflationary blue-tilted gravitational waves (BGW) in compliance with PTA data, conflict cosmological observations if reheat temperature after inflation is sufficiently high. Both these issues are circumvented with late entropy dilution, bringing DM abundance within observational limits and creating a doubly-peaked feature in the BGW spectrum consistent with cosmological observations. The blue-tilted tail of the low-frequency peak can fit NANOGrav 15 yr data, while other parts of the spectrum are within reach of present and future GW experiments.

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Section: Jcap03(2024)031mentioning

confidence: 99%

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Borah,

Das,

Samanta

2024

J. Cosmol. Astropart. Phys.

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“…When Φ > M P / √ ξ, it slow-rolls and causes inflation by virtue of its non-minimal coupling to gravity. Such a scenario provides tensor-to-scalar ratio and scalar spectral index [62][63][64][65], which are consistent with cosmological data from CMB experiments like Planck [38] and BICEP/Keck [39]. For example, with ξ 1, we have predictions for inflationary observables, namely the magnitude of spectral index (n s ) and tensor-to-scalar ratio (r) as r = 0.003, n s = 0.967 for number of e-folds N e = 60, which satisfies Planck 2018 data at 1σ level [38].…”

Section: Dynamics Of the Ad Fieldmentioning

confidence: 99%

Affleck-Dine cogenesis of baryon and dark matter

Borah

Jyoti

Okada

2023

J. High Energ. Phys.

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We propose a mechanism for cogenesis of baryon and dark matter (DM) in the universe via the Affleck-Dine (AD) route. An AD field which breaks the lepton number symmetry, leads to the generation of lepton asymmetry by virtue of its cosmic evolution, which then gets transferred into lepton and dark sectors. While the lepton asymmetry gets converted into baryon asymmetry via sphalerons, the dark sector asymmetry leads to the final DM abundance with the symmetric part being annihilated away due to resonantly enhanced annihilation, which we choose to be provided by a gauged B − L portal. Stringent constraints from DM direct detection forces DM and B − L gauge boson masses to be light, in the few GeV ballpark. While a large portion of the model parameter space is already ruled out, the remaining parameter space is within sensitivity of laboratory as well as cosmology based experiments. The AD field also plays the role of inflaton with the required dynamics by virtue of its non-minimal coupling to gravity, consistent with observations.

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“…During the decay of N 3 entropy is injected into the radiation bath [36] leading to dilution of the DM and baryon number density produced from PBH. Role of such late entropy injection in tackling DM over-abundance has been studied by several authors in different contexts [37][38][39][40][41][42][43][44][45].…”

Section: The Basic Frameworkmentioning

confidence: 99%

Cogenesis of Baryon asymmetry and gravitational dark matter from primordial black holes

Barman

Borah

Jyoti

et al. 2022

J. Cosmol. Astropart. Phys.

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We propose a scenario where dark matter (DM) with a wide mass range from a few keV to PeV can be produced solely from evaporating primordial black holes (PBH), while being consistent with the required free streaming length for structure formation. If DM does not have any other interactions apart from gravity and the universe has a PBH dominated phase at early epoch, then PBH evaporation typically leads to overproduction of DM in this mass range. By incorporating this gravitational DM within a Type-I seesaw scenario with three right handed neutrinos (RHN), we bring the abundance of PBH generated DM within observed limits by late entropy injection due to decay of one of the RHNs, acting as the diluter. The diluter, due to its feeble coupling with the bath particles, gets produced primarily from the PBH evaporation thereby leading to the second stage of early matter domination after the end of PBH dominated era. The other two RHNs contribute to the origin of light neutrino mass and also lead to the observed baryon asymmetry via leptogenesis with contributions from both thermally and PBH generated RHNs. The criteria of DM relic and baryon asymmetry can be satisfied simultaneously if DM mass gets restricted to a ballpark in the MeV-GeV regime with the requirement of resonant leptogenesis for heavier DM mass in order to survive the large entropy dilution at late epochs.

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Thermal keV dark matter in a gauged B-L model with cosmic inflation

Cited by 3 publications

References 60 publications

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Imprint of inflationary gravitational waves and WIMP dark matter in pulsar timing array data

Affleck-Dine cogenesis of baryon and dark matter

Cogenesis of Baryon asymmetry and gravitational dark matter from primordial black holes

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