Restrictions on parameters of sterile neutrino dark matter from observations of galaxy clusters

We find restrictions on the mass and mixing angle of the dark matter sterile neutrinos using x-ray observations of Coma and Virgo galaxy clusters with XMM-Newton satellite. In the absence of clearly detectable line, we present detailed analysis of various methods of putting restrictions on mass and mixing angle of sterile neutrino. Our analysis provides significant improvement over our previous results, coming from XRB background measurements. We also discuss restrictions from Virgo cluster by other authors and compare our results with them. © 2006 The American Physical Society.

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Concepts associés

Chargement

Publications associées

Chargement

Alexey Boyarsky, Oleg Ruchayskiy
2006
Article

Résumé

Official source

https://infoscience.epfl.ch/record/151142?ln=fr

À propos de ce résultat

Concepts associés (11)

Concepts associés

Chargement

Publications associées (10)

Chargement

Afficher plus

Publications associées

Chargement

Neutrino stérile

Le neutrino stérile est un type hypothétique de neutrino qui n'interagit via aucune des interactions fondamentales du modèle standard de la physique des particules, hormis la gravité. C'est un neutr

Neutrino

Le neutrino est une particule élémentaire du modèle standard de la physique des particules. Les neutrinos sont des fermions de , plus précisément des leptons. Ils sont électriquement neutres. Il en

Amas de galaxies

Un amas de galaxies, ou amas galactique, est l'association de plus d'une centaine de galaxies liées entre elles par la gravitation. En dessous de 100, on parle plutôt de groupe de galaxies, même si l

Constraints on sterile neutrino as a dark matter candidate from the diffuse X-ray background

Alexey Boyarsky, Oleg Ruchayskiy

Sterile neutrinos with masses in the kilo-electronvolt range are viable candidates for the warm dark matter. We analyse existing data for the extragalactic diffuse X-ray background for signatures of sterile neutrino decay. The absence of a detectable signal within current uncertainties of background measurements puts model-independent constraints on allowed values of the sterile neutrino mass and mixing angle, which we present in this work. © 2006 RAS.

2006

Chargement

On initial conditions for the Hot Big Bang

We analyse the process of reheating the Universe in the electroweak theory where the Higgs field plays a role of the inflaton. We estimate the maximal temperature of the Universe and fix the initial conditions for radiation-dominated phase of the Universe expansion in the framework of the Standard Model (SM) and of the νMSM - the minimal extension of the SM by three right-handed singlet fermions. We show that the inflationary epoch is followed by a matter dominated stage related to the Higgs field oscillations. We investigate the energy transfer from Higgs-inflaton to the SM particles and show that the radiation dominated phase of the Universe expansion starts at temperature Tr (3-15) × 1013GeV, where the upper bound depends on the Higgs boson mass. We estimate the production rate of singlet fermions at preheating and find that their concentrations at T r are negligibly small. This suggests that the sterile neutrino Dark Matter (DM) production and baryogenesis in the νMSM with Higgs-driven inflation are low energy phenomena, having nothing to do with inflation. We study then a modification of the νMSM, adding to its Lagrangian higher dimensional operators suppressed by the Planck scale. The role of these operators in Higgs-driven inflation is clarified. We find that these operators do not contribute to the production of Warm Dark Matter (WDM) and to baryogenesis. We also demonstrate that the sterile neutrino with mass exceeding 100keV (a Cold Dark Matter (CDM) candidate) can be created during the reheating stage of the Universe in necessary amounts. We argue that the mass of DM sterile neutrino should not exceed few MeV in order not to overclose the Universe. © 2009 IOP Publishing Ltd and SISSA.

2009

Chargement

The masses of active neutrinos in the nuMSM from X-ray astronomy

Alexey Boyarsky, Oleg Ruchayskiy

In an extension of the Standard Model by three relatively light right-handed neutrinos (the νMSM model) the role of the dark matter particle is played by the lightest sterile neutrino. We demonstrate that the observations of the extragalactic x-ray background allow us to put a strong upper bound on the mass of the lightest active neutrino and predict the absolute values of the mass of the two heavier active neutrinos in the νMSM provided that the mass of the dark matter sterile neutrino is larger than 1.8 keV. © Pleiades Publishing, Inc. 2006.

2006

Chargement

Afficher plus