Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Galin, N."'
Autor:
Babichev, Eugeny, Charmousis, Christos, Doneva, Daniela D., Gyulchev, Galin N., Yazadjiev, Stoytcho S.
There is strong observational evidence that almost every large galaxy has a supermassive black hole at its center. It is of fundamental importance to know whether such black holes are described by the standard Kerr solution in General Relativity (GR)
Externí odkaz:
http://arxiv.org/abs/2403.16192
Autor:
Gyulchev, Galin N., Roy, Ayush, Collodel, Lucas G., Nedkova, Petya G., Yazadjiev, Stoytcho S., Doneva, Daniela D.
We study the shadows cast by rotating hairy black holes with two non-trivial time-periodic scalar fields having a non-flat Gaussian curvature of the target space spanned by the scalar fields. Such black holes are a viable alternative to the Kerr blac
Externí odkaz:
http://arxiv.org/abs/2402.08469
Akademický článek
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Autor:
Gyulchev, Galin N., Stefanov, Ivan Zh.
In some models dark energy is described by phantom scalar fields (scalar fields with "wrong" sign of the kinetic term in the lagrangian). In the current paper we study the effect of phantom scalar field and/or phantom electromagnetic field on gravita
Externí odkaz:
http://arxiv.org/abs/1211.3458
Publikováno v:
Phys.Rev.D81:023005,2010
We investigate analytically gravitational lensing by charged, stationary, axially symmetric Kerr-Sen dilaton-axion black hole in the weak deflection limit. Approximate solutions to the lightlike equations of motion are present up to and including thi
Externí odkaz:
http://arxiv.org/abs/0909.3014
Publikováno v:
Phys.Rev.D78:083004,2008
We model massive compact objects in galactic nuclei as stationary, axially-symmetric naked singularities in the Einstein-massless scalar field theory and study the resulting gravitational lensing. In the weak deflection limit we study analytically th
Externí odkaz:
http://arxiv.org/abs/0806.3289
Publikováno v:
Phys.Rev.D75:023006,2007
In the present work we study numerically quasi-equatorial lensing by the charged, stationary, axially-symmetric Kerr-Sen dilaton-axion black hole in the strong deflection limit. In this approximation we compute the magnification and the positions of
Externí odkaz:
http://arxiv.org/abs/gr-qc/0611110
Autor:
Galin, N
Antarctic sea ice and its snow cover are integral components of the global climate system, yet many aspects of their vertical dimensions are poorly understood, making their representation in global climate models poor. Remote sensing is the key to mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54b8936ad6e755bb2b7aa8840c4e65ae
Autor:
GYULCHEV, GALIN N.1 gyulchev@phys.uni-sofia.bg, STEFANOV, IVAN Z. H.2 gyulchev@phys.uni-sofia.bg
Publikováno v:
Thirteenth Marcel Grossmann Meeting, The: on Recent Developments in Theoretical & Experimental General Relativity, Astrophysics & Relativistic Field Theories - Proceedings of the Mg13 Meeting on General Relativity (In 3 Volumes). 2015, p2091-2093. 3p.
Akademický článek
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