Oleg Ruchayskiy

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Related publications (45)

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

Mikhail Chapochnikov, Alexey Boyarsky, Oleg Ruchayskiy

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 ...

American Physical Society2006

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

Mikhail Chapochnikov, 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 signa ...

2006

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

Mikhail Chapochnikov, 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 backgro ...

2006

Observational manifestations of anomaly inflow

Mikhail Chapochnikov, Alexey Boyarsky, Oleg Ruchayskiy

In theories with chiral couplings, one of the important consistency requirements is that of the cancellation of a gauge anomaly. In particular, this is one of the conditions imposed on the hypercharges in the standard model. However, anomaly cancellation c ...

American Physical Society2005

Anomalies as a signature of extra dimensions

Mikhail Chapochnikov, Alexey Boyarsky, Oleg Ruchayskiy

The anomaly cancellation condition of the Standard Model may be unnatural in theories with extra dimensions as an anomaly of a low-energy 4-dimensional theory can be canceled by an inflow from a bulk. This inflow may give rise to an observable effect at lo ...

2005

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