Zobrazeno 1 - 10
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pro vyhledávání: '"Gal'tsov, D. V."'
Autor:
Khlopunov, M., Gal'tsov, D. V.
The paper is devoted to the study of gravitational radiation in the DGP model of gravity. It includes a detailed analysis of dynamical degrees of freedom of tensionless DGP and their comparison with other related theories. We develop a procedure for
Externí odkaz:
http://arxiv.org/abs/2408.10165
Autor:
Khlopunov, M., Gal'tsov, D. V.
In the DGP model, the graviton is unstable, which leads to a modification of gravity at cosmological distances. In particular, this leads to the leakage of gravitational waves from the brane into an extra dimension at large distances from the source.
Externí odkaz:
http://arxiv.org/abs/2209.04262
Autor:
Khlopunov, M., Gal'tsov, D. V.
We explore possible manifestations of an odd number of extra dimensions in gravitational radiation, which are associated with violation of Huygens' principle in flat odd-dimensional spacetime. Our setup can be regarded as the limit of an infinite com
Externí odkaz:
http://arxiv.org/abs/2201.11804
Autor:
Gal'tsov, D. V., Bushuev, D. S.
We investigate static spherically symmetric solutions in the Palatini kinetically coupled scalar-tensor theory, which reduces to gravity minimally coupled to a scalar field in Einstein frame. Using the fact that the Jordan and Einstein frame are rela
Externí odkaz:
http://arxiv.org/abs/2110.14784
Autor:
Gal'tsov, D. V., Khlopunov, M.
We consider gravitational radiation in the presence of non-compact extra dimensions. If their number is odd, all spacetime becomes odd-dimensional and formation of gravitational radiation becomes non-trivial because of violation of the Huygens princi
Externí odkaz:
http://arxiv.org/abs/2109.10600
Autor:
Gal'tsov, D. V., Khlopunov, M.
Free massless fields of any spin in flat D-dimensional spacetime propagate at the speed of light. But the retarded fields produced by the corresponding point-like moving sources share this property only for even D. Since the Green's functions of the
Externí odkaz:
http://arxiv.org/abs/2109.10586
Autor:
Gal'tsov, D. V., Khlopunov, M.
Publikováno v:
Phys. Rev. D 101, 084054 (2020)
In odd space-time dimensions, the retarded solution of the massless wave equation has support not only on the light cone, but also inside it. At the same time, a free massless field should propagate at the speed of light. The apparent contradiction o
Externí odkaz:
http://arxiv.org/abs/2003.00261
Autor:
Kobialko, K. V., Gal'tsov, D. V.
Publikováno v:
Eur. Phys. J. C 80, 527 (2020)
Photon region (PR) in the strong gravitational field is defined as a compact region where photons can travel endlessly without going to infinity or disappearing at the event horizon. In Schwarzschild metric PR degenerates to the two-dimensional photo
Externí odkaz:
http://arxiv.org/abs/2002.04280
Autor:
Gal'tsov, D. V., Kobialko, K. V.
Publikováno v:
Phys. Rev. D 100, 104005 (2019)
Recently, several new characteristics have been introduced to describe null geodesic structure of strong gravitational field, such as photon regions, transversely trapping surfaces and some generalizations. They give an alternative and concise way to
Externí odkaz:
http://arxiv.org/abs/1906.12065
Autor:
Gal'tsov, D. V., Kobialko, K. V.
Publikováno v:
Phys. Rev. D 99, 084043 (2019)
Recently, several new characteristics have been introduced to describe null geodesic structure of stationary spacetimes, such as photon regions (PR) and transversely trapping surfaces (TTS). The former are three-dimensional domains confining the sphe
Externí odkaz:
http://arxiv.org/abs/1901.02785