arXiv subjects

M. O. Astashenkov

Publications and source records attributed to M. O. Astashenkov.

4 recordsLinked to original sources

arXiv2024

Dilaton generation in propagation of magnetic dipole waves of pulsar in a galactic magnetic field

This study is devoted to dilaton generation in propagation of magnetic dipole waves of pulsar in a galactic magnetic field. It is shown that in this process it's necessary to take into account the presence of a reflective index of matter distributed in the galaxy. According to obtained estimates influence of the gravitational field of pulsars and magnetars on radiation of magnetic dipole waves is negligible and tends to a small change of their amplitude, near about 1 per cent. That's why in this study one can neglect the impact of gravitational field on process of dilaton generation. Exact solution of the dilaton equation is found and angular distribution of dilaton radiation is obtained in propagation of magnetic dipole waves of pulsar in galactic magnetic field.

astro-ph.HE↗

arXiv2024

Dilaton generation during the propagation of magnetic dipole radiation of a rotating neutron star through the Coulomb field of charged particle

According to the Dilaton-Einstein-Maxwell theory, dilatons can be generated by electromagnetic fields with a non-zero the Maxwell tensor invariant. This research focuses on the dilaton generation while magnetic dipole radiation from a rotating neutron star propagates through a Coulomb field created by a point-charged particle. The exact solution of the dilaton field equation has been obtained, and the angular distribution of dilaton generation has been established.

hep-ph↗

arXiv2018

Bound on a flux of ultra-high energy neutrinos in a scenario with extra dimensions

Assuming that a single-flavor diffuse neutrino flux dN_nu/dE_nu is equal to k*E_nu^(-2) in the energy range 10^(17) eV - 2.5*10^(19) eV, an upper bound on k is calculated in the ADD model as a function of the number of extra dimensions n and gravity scale M_D. An expected number of neutrino induced events at the Surface Detector array of the Pierre Auger Observatory is estimated.

hep-ph↗

arXiv2018

Bound on a diffuse flux of ultra-high energy neutrinos in the ADD model

The search for ultra-high energy downward-going and Earth-skimming cosmic neutrinos by the Surface Detector array of the Pierre Auger Observatory (PAO) is analyzed in the ADD model with n extra flat spatial dimensions. We assumed that the diffuse neutrino flux dN_nu/dE_nu$ is equal to k E_nu^(-20) in the energy range 10^(17) eV - 2.5 10^(19) eV. Taking into account that no neutrino events where found by the PAO, we have estimated an upper bound on a value of k. It is shown that this bound can be stronger than the upper bound on k recently obtained by the Pierre Auger Collaboration, depending on n and (n+4)-dimensional gravity scale M_D.

hep-ph↗