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pro vyhledávání: '"J. B. Formiga"'
Autor:
J. B. Formiga
Publikováno v:
Modern Physics Letters A. 37
The role played by the congruence in the prediction of the gravitational energy in the teleparallel equivalent of general relativity is discussed. It is shown that some congruences yield unphysical predictions. It is also shown that the energy–mome
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfa35f15fdbff06dae9a363f098848cf
https://doi.org/10.1142/s0217732322502224
https://doi.org/10.1142/s0217732322502224
Autor:
J. B. Formiga
Publikováno v:
Brazilian Journal of Physics. 51:1823-1832
Recently, a new method to simplify calculations in teleparallel theories has been put forward. In this article, this method is improved and used to analyze the gravitational energy–momentum tensor (density) of the Schwarzschild solution in a frame
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cca02659e9442cd2c9a3e4fa8071a04c
https://doi.org/10.1007/s13538-021-00975-8
https://doi.org/10.1007/s13538-021-00975-8
Autor:
J. B. Formiga, V. R. Gonçalves
In this paper, it is proved that the teleparallel energy-momentum generalizes that of the ADM formalism. In doing so, it is shown that the teleparallel $4$-momentum can be made to coincide with that of the ADM approach whenever the ADM $4$-momentum i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f1ae96c1f587f242551d6f54f3009a7
Autor:
J. B. Formiga, V. R. Gonalves
Publikováno v:
The European Physical Journal Plus. 136
Frames adapted to Kruskal and Novikov coordinate systems are used to compute the energy of the Schwarzschild black/white hole. It turns out that no regularization procedure is necessary if the right hypersurface of simultaneity is used. The importanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::101d7fa4522c9b153ce55221adbd1634
https://doi.org/10.1140/epjp/s13360-021-02062-y
https://doi.org/10.1140/epjp/s13360-021-02062-y
We revisit Weyl's unified field theory, which arose in 1918, shortly after general relativity was discovered. As is well known, in order to extend the program of geometrization of physics started by Einstein to include the electromagnetic field, H. W
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5f16553345082cc36c1ae4e6e904a155
Autor:
J. B. Formiga, V. R. Gonçalves
Publikováno v:
Modern Physics Letters A. 36:2150125
The teleparallel gravitational energy–momentum tensor density of the Friedmann–Lemaître–Robertson–Walker spacetime is calculated and analyzed: it is decomposed into density, isotropic pressure, non-isotropic pressures, and the heat-flux 4-ve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc77141eb504aeacdb06bb0dfec8f363
https://doi.org/10.1142/s021773232150125x
https://doi.org/10.1142/s021773232150125x
Autor:
J. B. Formiga
Despite the fact that General Relativity (GR) has been very successful, many alternative theories of gravity have attracted the attention of a significant number of theoretical physicists. Among these theories, we have theories with conformal symmetr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2f35d8f26d4a8b0d4ddcf06e23f35f2
http://arxiv.org/abs/1905.04764
http://arxiv.org/abs/1905.04764
Publikováno v:
International Journal of Modern Physics A. 35:2040005
We revisit Weyl’s unified field theory, which arose in 1918, shortly after general relativity was discovered. As is well known, in order to extend the program of geometrization of physics started by Einstein to include the electromagnetic field, H.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd86983849d488c853adbba3bf45fa8a
https://doi.org/10.1142/s0217751x20400059
https://doi.org/10.1142/s0217751x20400059
Autor:
J. B. Formiga
Publikováno v:
Annalen der Physik. 532:1900507
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::083ff9519f1f4c9930179d956ef33e42
https://doi.org/10.1002/andp.201900507
https://doi.org/10.1002/andp.201900507
Autor:
J. B. Formiga
Publikováno v:
International Journal of Theoretical Physics. 53:1971-1977
Recently, an extension of teleparallelism to a Weyl geometry which allows us to easily establish conformal invariance and "geometrize" electromagnetism has been presented. In this paper, I extend a result which concerns the existence of the Schwarzsc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1612db82119e36f580f65bd44f5219f8
https://doi.org/10.1007/s10773-014-2003-2
https://doi.org/10.1007/s10773-014-2003-2