Sterile neutrinos with pseudoscalar self-interactions and cosmology

Archidiacono, Maria; Hannestad, Steen; Hansen, Rasmus S. L.; Tram, Thomas

doi:10.1103/physrevd.93.045004

Cited by 57 publications

(70 citation statements)

References 52 publications

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“…The scenario of [45,243,250] assumes instead a non-standard interaction between the mainly sterile mass state ν 4 and a pseudoscalar field in a dark sector with a mass m φ m 4 . Assuming a pseudoscalar rather than a scalar boson allows to evade fifth force bounds.…”

Section: Avenues For Reconciling Light Sterile Neutrinos With Cosmologymentioning

confidence: 99%

Status of light sterile neutrino searches

Böser

Buck

Giunti

et al. 2020

Progress in Particle and Nuclear Physics

209

195

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A number of anomalous results in short-baseline oscillation may hint at the existence of one or more light sterile neutrino states in the eV mass range and have triggered a wave of new experimental efforts to search for a definite signature of oscillations between active and sterile neutrino states. The present paper aims to provide a comprehensive review on the status of light sterile neutrino searches in mid-2019: we discuss not only the basic experimental approaches and sensitivities of reactor, source, atmospheric, and accelerator neutrino oscillation experiments but also the complementary bounds arising from direct neutrino mass experiments and cosmological observations. Moreover, we review current results from global oscillation analyses that include the constraints set by running reactor and atmospheric neutrino experiments. They permit to set tighter bounds on the active-sterile oscillation parameters but as yet are not able to provide a definite conclusion on the existence of eV-scale sterile neutrinos.

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Section: Avenues For Reconciling Light Sterile Neutrinos With Cosmologymentioning

confidence: 99%

Status of light sterile neutrino searches

Böser

Buck

Giunti

et al. 2020

Progress in Particle and Nuclear Physics

209

195

View full text Add to dashboard Cite

show abstract

“…So, to avoid large non-minimal coupling, and for simplicity we shun the Higgs as inflaton. Using χ as inflaton is also problematic, as to have enough energy flow to the Higgs sector (and thus to SM sector) we need the field χ to couple to the Higgs field, but that consequently leads to a mass term of the χ field, thus χ not being light enough to evade Σm ν bound [44]. In order to bypass the above issues related to Higgs and χ fields, we introduce a separate inflaton field φ.…”

Section: Inflation Quantum Corrections and Threat To Flatness Of Potmentioning

confidence: 99%

“…2 While within the paradigm of standard cosmology all these constraints impact on the viability of a light sterile neutrino with sizable active-sterile mixing, it has been shown that the CMB constraints can be partly relaxed going beyond the standard cosmology modifying the primordial power spectrum at small scales [37], within the paradigm of modified gravity [38], within BSM physics with time-varying Dark Energy component [39], by light dark matter [40], from large lepton asymmetry [41]. However, it has been also pointed out that additional interactions in the sterile neutrino sector can also render such a scenario viable [42][43][44][45]. The presence of such interaction leads to the suppression of the active-sterile mixing angle and thus delay the DW production.…”

mentioning

confidence: 99%

Inflation, (p)reheating and neutrino anomalies: production of sterile neutrinos with secret interactions

et al. 2019

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A number of experimental anomalies involving neutrinos hint towards the existence of at least an extra (a very light) sterile neutrino. However, such a species, appreciably mixing with the active neutrinos, is disfavored by different cosmological observations like Big Bang Nucleosynthesis (BBN), Cosmic Microwave Background (CMB) and Large Scale Structure (LSS). Recently, it was shown that the presence of additional interactions in the sterile neutrino sector via light bosonic mediators can make the scenario cosmologically viable by suppressing the production of the sterile neutrinos from active neutrinos via matter-like effect caused by the mediator. This mechanism works assuming the initial population of this sterile sector to be negligible with respect to that of the Standard Model (SM) particles, before the production from active neutrinos. However, there is fair chance that such bosonic mediators may couple to the inflaton and can be copiously produced during (p)reheating epoch. Consequently, they may ruin this assumption of initial small density of the sterile sector. In this article we, starting from inflation, investigate the production of such a sterile sector during (p)reheating in a large field inflationary scenario and identify the parameter region that allows for a viable early Universe cosmology.

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“…[28] and have similar origin, namely, the initial velocity perturbations derived from a previous acoustic phase. These features are distinct from those of the other nonstandard models for which the growth of perturbations has been studied in detail [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. The purpose of this paper is to introduce this BDM model, highlight its predictions, and explain them analytically.…”

Section: Introductionmentioning

confidence: 96%

Ballistic Dark Matter oscillates above ΛCDM

Das¹,

Dasgupta²,

Khatri

2019

J. Cosmol. Astropart. Phys.

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Dark matter may have been relativistic and collisional until relatively late times and become cold and collisionless after a phase transition before the matter-radiation equality of the standard ΛCDM cosmology. We show that such a dark matter has large peculiar velocities due to acoustic oscillations before the phase transition, and evolves ballistically after the phase transition in the collisionless phase until the initial acoustic velocities are redshifted away. We show that this Ballistic Dark Matter (BDM) results in new non-trivial interesting features in the cosmological observables. In particular, the linear matter power spectrum exhibits acoustic oscillations on scales smaller than the Hubble scale at the time of phase transition, and for fast transitions the power at the acoustic peaks in the matter power spectrum exceeds that in a ΛCDM cosmology. If BDM only forms a part of the total dark matter, an odd vs. even acoustic peak asymmetry becomes prominent. We give an approximate analytical treatment of the linear perturbations in BDM, explaining these features. We also discuss the possibility to constrain BDM using cosmic microwave background and large scale structure data.

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Sterile neutrinos with pseudoscalar self-interactions and cosmology

Cited by 57 publications

References 52 publications

Status of light sterile neutrino searches

Status of light sterile neutrino searches

Inflation, (p)reheating and neutrino anomalies: production of sterile neutrinos with secret interactions

Ballistic Dark Matter oscillates above ΛCDM

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