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Time dependent embedding of spherically symmetric Rindler spacetime
anisotropic cosmic fluid MS energy curved Rindler ric heat flux
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2012/2/21
An anisotropic cosmic fluid with radial heat flux which sources a time dependent Rindler geometry is investigated. Even though its energy density $\rho$ is positive, the radial and transversal pressur...
Static and spherically symmetric black holes in $f(R)$ theories
Static spherically symmetric black holes theories
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2011/10/14
We study some features of static and spherically symmetric solutions (SSS) with a horizon in $f(R)$ theories of gravitation by means of a near-horizon analysis. A necessary condition for an $f(R)$ the...
VLBI-selected sample of Compact Symmetric Object candidates and frequency-dependent position of hotspots
Galaxies: active – Galaxies: jets – Radio continuum: galaxies – Methods:numerical – Magnetohydrodynamics (MHD) – Shock waves
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2011/9/27
The Compact Symmetric Objects (CSOs) are small (<1 kiloparsec) and powerful extragalactic radio sources showing emission on both sides of an active galactic nucleus and no signs of strong relativistic...
Enlargement of the Transformation Group of General Relativity: Spherically Symmetric Solutions
Gravity theory, transformation groups Lagrangians fi eld equations stellar model external spherically symmetric solutions
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2011/10/18
A theory has been presented previously in which the geometrical structure of a real four-dimensional space time manifold is expressed by a real orthonormal tetrad, and the group of diffeomorphisms is ...
Time-varying G in shift-symmetric scalar-tensor theories with a Vainshtein mechanism
shift-symmetric scalar-tensor theories Vainshtein mechanism
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2011/10/18
We show that the current bounds on the time variation of the Newton constant G can put severe constraints on many interesting scalar-tensor theories which possess a shift symmetry and a nonminimal mat...
Dynamics of Viscous Dissipative Plane Symmetric Gravitational Collapse
Gravitational collapse Dissipation Junction conditions Dynamical equations Transport equations
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2010/3/18
We present dynamical description of gravitational collapse in view of Misner and Sharp's formalism. Matter under consideration is a complicated fluid consistent with plane symmetry which we assume to ...
Boundary stress tensors for spherically symmetric conformal Rindler observers
surface energy conformal Rindler geometry horizon en-tropy equipartition law
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2010/3/22
The boundary energy - momentum tensors for a static observer in the conformally flat Rindler geometry are considered. We found the surface energy is positive far form the Planck world but the transver...
Low dispersion spectroscopy of point-symmetric PNe
Low dispersion spectroscopy point-symmetric PNe
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2009/6/11
Low dispersion spectroscopy of point-symmetric PNe。
Report on the Dynamical Evolution of an Axially Symmetric Quasar Model
Galaxies: orbits regular and chaotic motion
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2009/5/7
The role of the angular momentum in the regular or chaotic
character of motion in an axially symmetric quasar model is examined.
It is found that, for a given value of the critical angular momentum ...
ON THE ORBITAL MOTION OF A BODY IN A SPHERICALLY SYMMETRIC FIELD IN ROSEN'S BIMETRIC GRAVITATION THEORY
ORBITAL MOTION ROSEN'S BIMETRIC GRAVITATION THEORY SPHERICALLY SYMMETRIC FIELD
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2009/4/20
ON THE ORBITAL MOTION OF A BODY IN A SPHERICALLY SYMMETRIC FIELD IN ROSEN'S BIMETRIC GRAVITATION THEORY。
ON THE POTENTIAL ENERGY OF SPHERICALLY SYMMETRIC STELLAR SYSTEMS
POTENTIAL ENERGY SPHERICALLY SYMMETRIC STELLAR SYSTEMS
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2009/4/16
ON THE POTENTIAL ENERGY OF SPHERICALLY SYMMETRIC STELLAR SYSTEMS。
ON THE ORBITS IN NONSTATIC SPHERICALLY SYMMETRIC FIELDS IN ROSEN’S BIMETRIC GRAVITATION THEORY
GRAVITATION THEORY NONSTATIC SPHERICALLY SYMMETRIC FIELDS
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2009/4/8
ON THE ORBITS IN NONSTATIC SPHERICALLY SYMMETRIC FIELDS IN ROSEN`S BIMETRIC GRAVITATION THEORY。
ON THE GEODESICS FOR SPHERICALLY SYMMETRIC DILATON BLACK HOLE
SPHERICALLY SYMMETRIC DILATON BLACK HOLE
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2009/3/26
In this paper we shall investigate the timelike geodesics for an
extremal, spherically symmetric, massless dilaton black hole, using an exact solution
obtained by Gary Horowitz.
Report on the Dynamical Evolution of an Axially Symmetric Quasar Model
Galaxies: orbits regular and chaotic motion
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2010/9/16
The role of the angular momentum in the regular or chaotic character of motion in an axially symmetric quasar model is examined.It is found that, for a given value of the critical angular momentum Lzc...