6 research outputs found
Magnetized Particle Capture Cross Section for Braneworld Black Hole
Capture cross section of magnetized particle (with nonzero magnetic moment)
by braneworld black hole in uniform magnetic field is considered. The magnetic
moment of particle was chosen as it was done by \citet{rs99} and for the
simplicity particle with zero electric charge is chosen. It is shown that the
spin of particle as well as the brane parameter are to sustain the stability of
particles circularly orbiting around the black hole in braneworld i.e. spin of
particles and brane parameter try to prevent the capture by black hole.Comment: 7 pages, 4 figures, Accepted for publication in Astrophysics & Space
Scienc
Electromagnetic Fields of Slowly Rotating Compact Magnetized Stars in Braneworld
We study the structure of electromagnetic field of slowly rotating magnetized
star in a Randall-Sundrum II type braneworld. The star is modeled as a sphere
consisting of perfect highly magnetized fluid with infinite conductivity and
frozen-in dipolar magnetic field. Maxwell's equations for the external magnetic
field of the star in the braneworld are analytically solved in approximation of
small distance from the surface of the star. We have also found numerical
solution for the electric field outside the rotating magnetized neutron star in
the braneworld in dependence on brane tension. The influence of brane tension
on the electromagnetic energy losses of the rotating magnetized star is
underlined. Obtained "brane" corrections are shown to be relevant and have
non-negligible values. In comparison with astrophysical observations on pulsars
spindown data they may provide an evidence for the brane tension and, thus,
serve as a test for the braneworld model of the Universe.Comment: 11 pages, 5 figure
Low Energy Chiral Lagrangian in Curved Space-Time from the Spectral Quark Model
We analyze the recently proposed Spectral Quark Model in the light of Chiral
Perturbation Theory in curved space-time. In particular, we calculate the
chiral coefficients , as well as the coefficients ,
, and , appearing when the model is coupled to gravity. The
analysis is carried for the SU(3) case. We analyze the pattern of chiral
symmetry breaking as well as elaborate on the fulfillment of anomalies.
Matching the model results to resonance meson exchange yields the relation
between the masses of the scalar, tensor and vector mesons,
. Finally, the
large- limit suggests the dual relations in the vector and scalar
channels, and .Comment: 18 pages, no figure
Relativistic astrophysics at GR20
We report the recent advances in Relativistic Astrophysics as presented at the GR20 meeting in Warsaw, Poland, in July 2013