293 research outputs found
Soliton Nature of Equilibrium State of Two Charged Masses in General Relativity
New derivation of static equilibrium state for two charged masses in General
Relativity is given in the framework of the Inverse Scattering Method as an
alternative to our previous derivation of this solution by the Integral
Equation Method. This shows that such solution is of solitonic character and
represents the particular case of more general (12-parametric) stationary
axisymmetric electrovacuum two-soliton solution for two rotating charged
objects obtained by one of the authors in 1986. This result gives an additional
support to our comprehension that the appropriate analytical continuations of
solitonic solutions in the space of their parameters are always possible and
that applicability of the Inverse Scattering Method in presence of
electromagnetic field is not restricted only to the cases with naked
singularities.Comment: 7 pages, RevTeX
On the cosmological singularity
The long story of the oscillatory approach to the initial cosmological
singularity and its more recent incarnation in multidimensional universe models
is told.Comment: The invited paper for Proceedings of the XIII Marcel Grossmann
Meeting (Stockholm, 2012) by reason of the Marcel Grossmann Award to V.A.
Belinski and I.M. Khalatniko
On the integrable gravity coupled to fermions
In the present letter we indicate an extension of the pure gravity inverse
scattering integration technique to the case when fermions (introduced on the
base of supersymmetry) are present. In this way the integrability technique for
simple () supergravity in two space-time dimensions coupled to the matter
fields taking values in the Lie algebra of group is
developed. This theory contains matter living only in one Weyl representation
of and represents the reduction to two dimensions of the
three-dimensional simple supergravity constructed in [1].
Our spectral linear problem use superspace and covers the complete set of
principal bosonic and fermionic equations of motion. This linear system, as in
pure gravity, contains only the first order poles with respect to the spectral
parameter. The procedure of constructing the exact super-solitonic solutions is
outlined.Comment: Version 1611.02924v1 was withdrawn due to groundless assumption on
the existence of the relation (43). In footnote 7 it was stressed that its
proof remains to be seen. Analysis showed that such relation indeed is
doubtful. Then the extension of the pure gravity inverse scattering method to
superspace surely can cover only the simple integrable supergravity with
E8(8) symmetr
Superposition of fields of two rotating charged masses in General Relativity and existence of equilibrium configurations
It is known that two Reissner-Nordstrom black holes or two overextreme
Reissner-Nordstrom sources cannot be in physical equilibrium. In the static
case such equilibrium is possible only if one of the sources is a black hole
and another one is a naked singularity. We define the notion of physical
equilibrium in general (stationary) case when both components of a binary
system are rotating and show that such system containing a Kerr-Newman black
hole and a Kerr-Newman naked singularity also can stay in physical equilibrium.
The similar question about the system of two charged rotating black holes or
two rotating overextreme charged sources still remains open.Comment: 20 pages, no figures. arXiv admin note: substantial text overlap with
arXiv:1211.396
Superposition of fields of two Reissner - Nordstrom sources
In this paper we present a 5-parametric family of static asymptotically flat
solutions for the superposed gravitational and electromagnetic fields of two
Reissner-Nordstr\"om sources with arbitrary parameters -- masses, charges and
separating distance. A procedure for solving of the linear singular integral
equation form of the electrovacuum Einstein - Maxwell equations for stationary
axisymmetric fields is described in detail. The 4-parametric family of
equilibrium configurations of two Reissner-Nordstr\"om sources (one of which
should be a black hole and another one -- a naked singularity) presented in our
recent paper \cite{Alekseev-Belinski:2007} arises after a restriction of the
parameters of the 5-parametric solution presented here by the equilibrium
condition which provides the absence in the solution of conical points on the
symmetry axis between the sources.Comment: 24 pages, submitted to the Proceedings of the Eleventh Marcel
Grossmann Meeting (Berlin, July 23 - 29, 2006
Complete integrability of higher-dimensional Einstein equations with additional symmetry, and rotating black holes
A new derivation of the five-dimensional Myers-Perry black-hole metric as a
2-soliton solution on a non-flat background is presented. It is intended to be
an illustration of how the well-known Belinski-Zakharov method can be applied
to find solutions of the Einstein equations in D-dimensional space-time with
D-2 commuting Killing vectors using the complete integrability of this system.
The method appears also to be promising for the analysis of the uniqueness
questions for higher-dimensional black holes.Comment: 11 page
Mass ratio in SS433 revisited
We revisit the determination of binary mass ratio in the Galactic microquasar
SS433 based on recent GRAVITY VLTI measurements of mass and angular momentum
outflow through a circumbinary disc. The new observations combined with the
constancy of the binary orbital period over yrs confirm that the mass
ratio in SS433 is . For the assumed
optical star mass ranging from to 15 such a
mass ratio suggests a low limit of the compact object mass of , placing the compact object in SS433 as a stellar-mass black hole.Comment: 4 pages, 3 figures, accepted in MNRAS, Main Journa
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