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pro vyhledávání: '"Davydov, E. A."'
Gravitational shockwaves are geometries where components of the transverse curvature have abrupt behaviour across null hypersurfaces, which are fronts of the waves. We develop a general approach to describe classical field theories on such geometries
Externí odkaz:
http://arxiv.org/abs/2408.05142
Null cosmic strings are shown to disturb gravitational fields of massive bodies and create outgoing gravitational waves (GW). Perturbations of the metric caused by a straight null string and a point-like massive source are found as solutions to linea
Externí odkaz:
http://arxiv.org/abs/2311.01863
Autor:
DA ROSA, JOSÉLIA EUZÉBIO1,2 joselia.rosa@unisul.br, DAMAZIO, ADEMIR3,4 add@unesc.net, CRESTANI, SANDRA5 sandra_crestani@hotmail.com
Publikováno v:
Educação Matemática Pesquisa. 2014, Vol. 16 Issue 1, p167-187. 21p.
Akademický článek
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A straightforward application of the variational principle to null strings meets difficulties since string's world-sheets are degenerate. It is known that the variational principle in this case can be formulted with the help of two-vector density on
Externí odkaz:
http://arxiv.org/abs/2210.09891
Equations of motion of null cosmic strings near black holes, or other massive sources, are solved exactly in the weak field approximation. The stress-energy tensor of a null string in a curved spacetime is introduced and used to show how scattering b
Externí odkaz:
http://arxiv.org/abs/2203.02673
Akademický článek
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Autor:
Souza, Simone Ariomar de
Publikováno v:
Biblioteca Digital de Teses e Dissertações da PUC_GOAISPontifícia Universidade Católica de GoiásPUC_GO.
Made available in DSpace on 2016-07-27T13:45:05Z (GMT). No. of bitstreams: 1 SIMONE ARIOMAR DE SOUZA.pdf: 1681724 bytes, checksum: 8cdcef796be8a6f28a490b9dd627390d (MD5) Previous issue date: 2015-08-07
Situated in the didactic, this research is
Situated in the didactic, this research is
Externí odkaz:
http://localhost:8080/tede/handle/tede/729
Autor:
Davydov, E. A.
We show that there are two classes of solutions that describe static spherically symmetric dyonic dilaton black holes with two nonsingular horizons. The first class includes only the already known solutions that exist for a few special values of the
Externí odkaz:
http://arxiv.org/abs/1711.04198
Autor:
Davydov, E. A.
We compare cosmologic and spherically symmetric solutions to metric and Palatini versions of vector Horndeski theory. It appears that Palatini formulation of the theory admits more degrees of freedom. Specifically, homogeneous isotropic configuration
Externí odkaz:
http://arxiv.org/abs/1708.09796