Zobrazeno 1 - 10
of 16
pro vyhledávání: '"M. L. Bedran"'
Publikováno v:
The Astrophysical Journal. 549:716-720
In this paper we use the integration scheme for the exact spherically symmetric Einstein field equations in observational coordinates recently developed by Araujo and Stoeger, and input data functions for area distance and galaxy number counts that w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afb5b0491442339fb175f654aafc9eb9
https://doi.org/10.1086/319431
https://doi.org/10.1086/319431
Publikováno v:
Physical Review D. 55:3431-3439
The gravitational properties of the only static plane-symmetric vacuum solution of Einstein's field equations without a cosmological term (Taub's solution, for brevity) are presented: some already known properties (geodesics, weak field limit, and pe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0513205e8aba2344435b6e9696ebe4a
https://doi.org/10.1103/physrevd.55.3431
https://doi.org/10.1103/physrevd.55.3431
Autor:
M L Bedran, M O Calvao
Publikováno v:
Classical and Quantum Gravity. 10:767-771
The puzzling possibility of a nonequilibrium fluid to evolve reversibly (i.e. with vanishing rate of entropy production), provided it flows along a conformal Killing vector field of a background spacetime, is examined. A hypothetical example in a Rob
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d07e1e7064ee7896e335762fe8d9ac3e
https://doi.org/10.1088/0264-9381/10/4/011
https://doi.org/10.1088/0264-9381/10/4/011
Publikováno v:
American Journal of Physics. 60:545-549
A geometric and intuitive definition of dual vectors and some simple physical applications are given. Dual vectors are used in many branches of mathematics and physics on a high and less accessible level. It is shown that dual vectors are as simple a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ad28755dae655493e98a4ea633272db
https://doi.org/10.1119/1.16872
https://doi.org/10.1119/1.16872
Extending the approach developed by Ara\'ujo and Stoeger [1] and improved in Ara\'ujo {\it et al} [2], we have shown how to construct dust-filled $\Lambda \neq 0$ Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) cosmological models from FLRW cosmologi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc4162ac444c2e6395d995134de14ba9
http://arxiv.org/abs/0807.4193
http://arxiv.org/abs/0807.4193
The emission and absorption of gravitational waves and massless particles of an infinitely long straight cosmic string with finite thickness are studied. It is shown in a general term that the back reaction of the emission and absorption {\em always}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0c23f40197ae6cc067e3bb62a59a0187
Publikováno v:
Progress of Theoretical Physics. 67:683-688
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::886410f4884caf4628ef01685f00a695
https://doi.org/10.1143/ptp.67.683
https://doi.org/10.1143/ptp.67.683
Autor:
L. C. G. de Andrade, M. L. Bedran
Publikováno v:
Progress of Theoretical Physics. 70:1583-1587
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d889061cbe689a778122c6564facda34
https://doi.org/10.1143/ptp.70.1583
https://doi.org/10.1143/ptp.70.1583
Publikováno v:
Il Nuovo Cimento B Series 11. 87:101-108
The role of torsion and spin has been studied in the case of stationary universe with Weyssenhoff fluid under rigid rotation. It is shown that, when the pressure bears a linear relation with the density, there exist closed timelike lines. Only when t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0b9c3d19ac7a7a17673bc969e93cada
https://doi.org/10.1007/bf02721532
https://doi.org/10.1007/bf02721532
Autor:
M L Bedran, M M Som
Publikováno v:
Journal of Physics A: Mathematical and General. 15:3539-3542
A unique class of solutions of the classical spin fluid with zero pressure is obtained. The spin density vanishes at the boundary of the fluid sphere and the gmu v and their derivatives satisfy continuity conditions with the exterior metric.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f02f17c65c7aa5aeed689e218ceed1d
https://doi.org/10.1088/0305-4470/15/11/031
https://doi.org/10.1088/0305-4470/15/11/031