Lyman-alpha Forests cool Warm Dark Matter

Baur, Julien; Palanque-Delabrouille, Nathalie; Yèche, Christophe; Magneville, Christophe; Viel, Matteo

doi:10.48550/arxiv.1512.01981

Cited by 28 publications

(45 citation statements)

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“…Light sterile neutrinos from DW production feature a momentum distribution that can be approximated by a rescaled Fermi-Dirac distribution, and also have nearly the same transfer function as the thermal relics. Therefore, the rescaling relation between m WDM and m s is valid [62,74]…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Lyman-α forest data, coming from observing the Lyman-α transition in hydrogen gas of the Universe, gives the intergalactic medium distribution, from which the WDM velocity dispersion can be extracted. Current Lyman-α bound at the 95% confidence level on the WDM mass is [61][62][63][64][65] m WDM (1.9 − 5.3) keV .…”

Section: Constraints From Astrophysics and Structure Formationmentioning

confidence: 99%

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Inverse Seesaw Model with a Modular $S^{}_4$ Symmetry: Lepton Flavor Mixing and Warm Dark Matter

Zhang,

Zhou

2021

Preprint

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In this paper, we present a systematic investigation on simple inverse seesaw models for neutrino masses and flavor mixing based on the modular S 4 symmetry. Two right-handed neutrinos and three extra fermion singlets are introduced to account for light neutrino masses through the inverse seesaw mechanism, and to provide a keV-mass sterile neutrino as the candidate for warm dark matter in our Universe. Considering all possible modular forms with weights no larger than four, we obtain twelve models, among which we find one is in excellent agreement with the observed lepton mass spectra and flavor mixing. Moreover, we explore the allowed range of the sterile neutrino mass and mixing angles, by taking into account the direct search of X-ray line and the Lyman-α observations. The model predictions for neutrino mixing parameters and the dark matter abundance will be readily testable in future neutrino oscillation experiments and cosmological observations.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Constraints From Astrophysics and Structure Formationmentioning

confidence: 99%

Inverse Seesaw Model with a Modular $S^{}_4$ Symmetry: Lepton Flavor Mixing and Warm Dark Matter

Zhang,

Zhou

2021

Preprint

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“…Large initial momentum will naturally suppress the structure formation at small scales. In this section, we will study this in detail and evaluate the possible constraints on the present dark matter velocity from the well-known Lyman-α bound on the dark matter mass for warm dark matter (WDM) [59][60][61][62][63][64][65]. If the dark matter has no interaction with itself or with the SM particles, the momentum of the dark matter particles is redshifted by the expansion of the universe.…”

Section: Momentum Free Streaming Length and Constraintsmentioning

confidence: 99%

“…Combining Eqns. ( 57), ( 58), (62), and (63), we obtain the expression of the free-streaming length for gravitationally produced dark matter as follows…”

Section: Momentum Free Streaming Length and Constraintsmentioning

confidence: 99%

“…Those properties play significant role in clustering of matter on galactic and sub-galactic scales [56][57][58]. Observing those small scale matter power spectrum by mapping the Lyman-α [59][60][61][62][63][64][65]96] forest of absorption lines of light from low redshift (z = 2 − 4) quasars can differentiate different non-cold DM production mechanism and its intrinsic properties.…”

Section: Introductionmentioning

confidence: 99%

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Gravitational dark matter: free streaming and phase space distribution

Haque¹,

Maity²

2021

Preprint

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Gravitational dark matter (DM) is the simplest possible scenario that has recently gained interest in the early universe cosmology. In this scenario, DM is assumed to be produced from the decaying inflaton through the gravitational interaction during reheating. Gravitational production from the radiation bath will be ignored as our analysis shows it to be suppressed for a wide range of reheating temperature (T re ).Ignoring any other internal parameters except the DM mass (m Y ) and spin, a particular inflation model such as α-attractor, with a specific scalar spectral index (n s ) has been shown to uniquely fix the dark matter mass of the present universe. For fermion type dark matter we found the mass m f should be within (10 4 − 10 13 ) GeV, and for boson type DM, the mass m s/X turned out to be within (10 −8 − 10 13 ) GeV.Interestingly, if the inflaton equation of state ω φ → 1/3, the DM mass also approaches towards unique value, m f ∼ 10 10 GeV and m s/X ∼ 10 3 ( 8 × 10 3 ) GeV irrespective of the value of ω φ . We further analyzed the phase space distribution (f Y ), and free streaming length (λ f s ) of these gravitationally produced DM. f Y , which is believed to encode important information about DM, is shown to contain a characteristic primary peak at the initial time where the gravitational production is maximum for both fermion/boson. Apart from this fermionic phase-space distribution function contains an additional peak near the inflaton and fermion mass equality (m Y = m φ ) arising for ω φ > 5/9. Furthermore, the height of this additional peak turned out to be increasing with decreasing T re , and at some point dominates over the primary one. Since reheating is a causal process and dark matter is produced during this phase, gravitational instability forming small-scale DM structures during this period will encode those phase space information and be observed at present. Crucial condition λ f s < λ re of forming such small scale DM structure during reheating has been analyzed in detail. We further estimate in detail the range of scales within which the above condition will be satisfied for different dark matter masses. Finally, we end by stating the fact that all our results are observed to be insensitive on the parameter α of the inflaton potential within the allowed range set by the latest Planck and BICEP/Keck results.

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LHC-friendly minimal freeze-in models

Bélanger

Desai

Goudelis

et al. 2019

J. High Energ. Phys.

136

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We propose simple freeze-in models where the observed dark matter abundance is explained via the decay of an electrically charged and/or coloured parent particle into Feebly Interacting Massive Particles (FIMP). The parent particle is long-lived and yields a 1 The HL-LHC is expected to produce ∼ 10 8 Higgs bosons. Typical freeze-in values for yχ lie in the O(10 −13 − 10 −7 ) range, would yield less than 10 −4 DM events at the HL-LHC in our scenario.2 Since, as we will see later on, the DM production at the LHC will occur via the Y Y final state, fermions will have slightly larger production cross-sections than scalars.3 See Ref.[57] for an exception to this, mostly focused on χ being a fermion (a gravitino in Gauge-Mediated Supersymmetry Breaking scenarios) and Y being a scalar lepton (a right-handed stau), but also considering the case of a scalar χ and a fermionic, right-handed Y .

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Lyman-alpha Forests cool Warm Dark Matter

Cited by 28 publications

References 0 publications

Inverse Seesaw Model with a Modular $S^{}_4$ Symmetry: Lepton Flavor Mixing and Warm Dark Matter

Inverse Seesaw Model with a Modular $S^{}_4$ Symmetry: Lepton Flavor Mixing and Warm Dark Matter

Gravitational dark matter: free streaming and phase space distribution

LHC-friendly minimal freeze-in models

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