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Mikhail Chapochnikov

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Publications associées (139)

Can an odd number of fermions be created due to chiral anomaly?

Yannis Burnier, Mikhail Chapochnikov

We describe a possible creation of an odd number of fractionally charged fermions in the 1+1 dimensional Abelian Higgs model. We point out that for 1+1 dimensions this process does not violate any symmetries of the theory, nor makes it mathematically incon ...

American Physical Society2006

On the hadronic contribution to sterile neutrino production

Mikhail Chapochnikov

2006

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

The nuMSM, dark matter and neutrino masses

Mikhail Chapochnikov

An extension of the minimal standard model by three right-handed neutrinos with masses smaller than the electroweak scale (the νMSM) allows to explain simultaneously neutrino oscillations and dark matter in the universe. We show how to fix the absolute val ...

2006

The MSM, dark matter and baryon asymmetry of the Universe

Mikhail Chapochnikov

We discuss here a mechanism of baryon asymmetry generation in an extension of the minimal standard model by three right-handed neutrinos with masses smaller than the electroweak scale (the νMSM). © 2006 IOP Publishing Ltd. ...

2006

The nuMSM, dark matter and neutrino masses

Mikhail Chapochnikov, Steve Blanchet

We investigate an extension of the Minimal Standard Model by right-handed neutrinos (the νMSM) to incorporate neutrino masses consistent with oscillation experiments. Within this theory, the only candidates for dark matter particles are sterile right-hande ...

2005

Astrophysical bounds on supersymmetric dark-matter Q- balls

Mikhail Chapochnikov

Stable baryonic Q-balls, which appear in supersymmetric extensions of the Standard Model, could form at the end of cosmological inflation from fragmentation of the Affleck-Dine condensate. We reconsider astrophysical constraints on such Q-balls as dark mat ...

2005

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

One-loop fermionic corrections to the instanton transition in two dimensional chiral Higgs model

Yannis Burnier, Mikhail Chapochnikov

The one-loop fermionic contribution to the probability of an instanton transition with fermion number violation is calculated in the chiral Abelian Higgs model in 1+1 dimensions, where the fermions have a Yukawa coupling to the scalar field. The dependence ...

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

Primordial magnetic fields

Mikhail Chapochnikov

We discuss here the following questions related to magnetic fields in the early universe: 1. Observational constraints on primordial magnetic fields. 2. Different ideas put forward for explanation of large scale fields which can seed the galactic magnetic ...

2005

The fate of the zero mode of the five-dimensional kink in the presence of gravity

Katarzyna Zuleta Estrugo, Mikhail Chapochnikov

2005

The nuMSM, dark matter and baryon asymmetry of the universe

Mikhail Chapochnikov

We show that the extension of the standard model by three right-handed neutrinos with masses smaller than the electroweak scale (the νMSM) can explain simultaneously dark matter and baryon asymmetry of the universe and be consistent with the experiments on ...

2005

Supersymmetric dark matter Q-balls and their interactions in matter

Mikhail Chapochnikov

Supersymmetric extensions of the Standard Model contain nontopological solitons, Q-balls, which can be stable and can be a form of cosmological dark matter. Understanding the interaction of SUSY Q-balls with matter fermions is important for both astrophysi ...

American Physical Society2005

Brane-worlds and theta-vacua

Mikhail Chapochnikov

Reductions from odd to even dimensionalities (5 → 4 or 3 → 2), for which the effective low-energy theory contains chiral fermions, present us with a mismatch between ultraviolet and infrared anomalies. This applies to both local (gauge) and global currents ...

American Physical Society2005

Superheavy dark matter and supersymmetry

Mikhail Chapochnikov

We discuss supersymmetric Q-balls as possible candidates for dark matter particles, their interaction in matter and astrophysical constraints on their existence. © 2005 Elsevier B.V. All rights reserved. ...

2005

Primordial magnetic fields, anomalous isocurvature fluctuations and big bang nucleosynthesis

Mikhail Chapochnikov

1998

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