23 research outputs found
Special features in the asymptotic expression of the electromagnetic spectrum from dipole which free fall into a Schwarzschild black hole
The characteristic features were found in the electromagnetic spectrum of
radiation from free falling dipole, when it is fall radially into a
Schwarzschild black hole. These features can be used as another method for the
black hole mass determinating. Also, these features can be used for the
determination some characteristics of the magnetosphere or the accretion disk
around the black hole.Comment: 13 pages, 5 figure
Spectrum for the electric dipole which nonradially falling into a black hole
The electromagnetic bremsstrahlung spectrum for the dipole which falling by a
spiral orbit into the Schwarzschild black hole was found. The characteristic
features in this electromagnetic spectrum can be used for determine of the
black hole mass by the new way. This new way (if implemented) provides higher
accuracy in determining of the black hole mass. Also these features in the
spectrum can be used for determine of the certain characteristics in the black
hole magnetosphere or in the accretion disk characteristics around the black
hole. It is also shown that the asymptotic behavior of this spectrum (at high
frequencies) is practically independent from the impact parameter of the
falling dipole.Comment: 15 pages, 3 figures. To appear in IJMPD, 201
Passage of radiation through wormholes
We investigate numerically the process of the passage of a radiation pulse
through a wormhole and the subsequent evolution of the wormhole that is caused
by the gravitational action of this pulse. The initial static wormhole is
modeled by the spherically symmetrical Armendariz-Picon solution with zero
mass. The radiation pulses are modeled by spherically symmetrical shells of
self-gravitating massless scalar fields. We demonstrate that the compact signal
propagates through the wormhole and investigate the dynamics of the fields in
this process for both cases: collapse of the wormhole into the black hole and
for the expanding wormhole.Comment: 18 Pages, 13 figures, minor typos corrected, updated reference
New analytic models of traversable wormholes
The analytic solution of the general relativity equations for spherically
symmetric wormholes are given. We investigate the special case of a
"traversable" wormhole i.e., one allowing the signal to pass through it. The
energy-momentum tensor of wormhole matter is represented as a superposition of
a spherically symmetric magnetic field and dust matter with negative matter
density. The dynamics of the model are investigated. We discuss both the
solution of the equation with a Lambda-term and without it. Superposing enough
dust matter, a magnetic field, and a Lambda-term can produce a static solution,
which turns out to be a spherical Multiverse model with an infinite number of
wormholes connected spherical universes. Corresponding solution can be static
and dynamic.Comment: 15 pages, 2 figure