Sterile neutrino dark matter from freeze-in

Shakya, Bibhushan

doi:10.1142/s0217732316300056

Cited by 74 publications

(82 citation statements)

References 158 publications

(237 reference statements)

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“…Now the integral P ≡ R 1 0 dzP f ðzÞ gives the probability of having a small enough initial field value s Ã to get below the isocurvature constraint (19).…”

Section: B Isocurvature From a Primordial Sourcementioning

confidence: 99%

“…The adiabatic component, produced via the freeze-in mechanism, is relativistic before thermalization, so the initial energy density given by (3) scales as ρ ∼ a −4 from the initial freeze-in temperature T ≈ 1 2 m h to the thermalization temperature T ≈ m s . After the equilibration of the dark sector, the particles from both origins will contribute to the thermal bath of dark matter, so that the relative abundance of the isocurvature component with respect to the total dark matter abundance will remain constant from there on and we can directly apply the result (19) to evaluate the isocurvature constraint in this case.…”

Section: Dark Matter Self-interactionsmentioning

confidence: 99%

“…We investigate in detail the interplay between the constraints arising from the cosmological and astrophysical observations. Earlier studies on observational properties of frozen-in dark matter in similar models include the case of an ultra-strongly interacting dark matter [16], cosmological, astrophysical and collider constraints on sterile neutrinos [17][18][19][20], and displaced signatures at colliders [21,22]. Frozen-in dark matter has also been used to explain the disagreement between structure formation in cold dark matter simulations and observations [23].…”

Section: Introductionmentioning

confidence: 99%

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Observational constraints on decoupled hidden sectors

et al. 2016

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We consider an extension of the Standard Model with a singlet sector consisting of a real (pseudo)scalar and a Dirac fermion coupled with the Standard Model only via the scalar portal. We assume that the portal coupling is weak enough for the singlet sector not to thermalize with the Standard Model allowing the production of singlet particles via the freeze-in mechanism. If the singlet sector interacts with itself sufficiently strongly, it may thermalize within itself, resulting in dark matter abundance determined by the freeze-out mechanism operating within the singlet sector. We investigate this scenario in detail. In particular, we show that requiring the absence of inflationary isocurvature fluctuations provides lower bounds on the magnitude of the dark sector self-interactions and in parts of the parameter space favors sufficiently large self-couplings, supported also by the features observed in the small-scale structure formation.

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“…Now the integral P ≡ R 1 0 dzP f ðzÞ gives the probability of having a small enough initial field value s Ã to get below the isocurvature constraint (19).…”

Section: B Isocurvature From a Primordial Sourcementioning

confidence: 99%

Section: Dark Matter Self-interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observational constraints on decoupled hidden sectors

et al. 2016

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“…2016;Merle & Schneider 2015), thereby strongly pushing such scenarios. Other settings, where sterile neutrinos are produced by decays of, e.g., scalar particles (see a few concrete examples in Shaposhnikov & Tkachev 2006;Kusenko 2006;Petraki & Kusenko 2008;Merle et al 2014;Merle & Totzauer 2015;Klasen & Yaguna 2013;Adulpravitchai & Schmidt 2015;Shakya 2016;König et al 2016), are largely unconstrained by present X-ray observations, since they could in principle operate even without active-sterile mixing. Note that the corresponding parent in such Scalar Decay (SD) models must themselves be coupled to the Standard Model, typically via the Higgs sector.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Physics with the Hubble Frontier Fields: Constraining Dark Matter Models with the Abundance of Extremely Faint and Distant Galaxies

Menci

Merle

Totzauer

et al. 2017

ApJ

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We show that the measured abundance of ultra-faint lensed galaxies at z ≈ 6 in the Hubble Frontier Fields (HFF) provides stringent constraints on the parameter space of i) Dark Matter models based on keV sterile neutrinos; ii) the "fuzzy" wavelike Dark Matter models, based on Bose-Einstein condensate of ultra-light particles. For the case of the sterile neutrinos, we consider two production mechanisms: resonant production through the mixing with active neutrinos and the decay of scalar particles. For the former model, we derive constraints for the combination of sterile neutrino mass m ν and mixing parameter sin 2 (2θ) which provide the tightest lower bounds on the mixing angle (and hence on the lepton asymmetry) derived so far by methods independent of baryonic physics. For the latter we compute the allowed combinations of the scalar mass, its coupling to the Higgs field, and the Yukawa coupling of the scalar to the sterile neutrinos. We compare our results to independent, existing astrophysical bounds on sterile neutrinos in the same mass range. For the case of "fuzzy" Dark Matter, we show that the observed number density ≈ 1/Mpc 3 of high-redshift galaxies in the HFF sets a lower limit m ψ ≥ 8 · 10 −22 eV (at 3-σ confidence level) on the particle mass, a result that strongly disfavors wavelike bosonic Dark Matter as a viable model for structure formation. We discuss the impact on our results of uncertainties due to systematics in the selection of highly magnified, faint galaxies at high redshifts.

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“…One such class of dark matter candidates is the Feebly Interacting Massive Particle or FIMP [11][12][13][14][15][16][17][18]. The interaction rates of these particles are so feeble that they never attained thermal equilibrium with the thermal bath.…”

Section: Jhep02(2017)123mentioning

confidence: 99%

FIMP and muon (g − 2) in a U(1) Lμ−Lτ model

Biswas

Choubey

Khan

2017

J. High Energ. Phys.

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The tightening of the constraints on the standard thermal WIMP scenario has forced physicists to propose alternative dark matter (DM) models. One of the most popular alternate explanations of the origin of DM is the non-thermal production of DM via freeze-in. In this scenario the DM never attains thermal equilibrium with the thermal soup because of its feeble coupling strength (∼ 10 −12 ) with the other particles in the thermal bath and is generally called the Feebly Interacting Massive Particle (FIMP). In this work, we present a gauged U(1) Lµ−Lτ extension of the Standard Model (SM) which has a scalar FIMP DM candidate and can consistently explain the DM relic density bound. In addition, the spontaneous breaking of the U(1) Lµ−Lτ gauge symmetry gives an extra massive neutral gauge boson Z µτ which can explain the muon (g − 2) data through its additional one-loop contribution to the process. Lastly, presence of three right-handed neutrinos enable the model to successfully explain the small neutrino masses via the Type-I seesaw mechanism. The presence of the spontaneously broken U(1) Lµ−Lτ gives a particular structure to the light neutrino mass matrix which can explain the peculiar mixing pattern of the light neutrinos.

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Sterile neutrino dark matter from freeze-in

Cited by 74 publications

References 158 publications

Observational constraints on decoupled hidden sectors

Observational constraints on decoupled hidden sectors

Fundamental Physics with the Hubble Frontier Fields: Constraining Dark Matter Models with the Abundance of Extremely Faint and Distant Galaxies

FIMP and muon (g − 2) in a U(1) Lμ−Lτ model

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