The gravitational energy density of the Universe
| Autor: | J. B. Formiga, V. R. Gonçalves |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Nuclear and High Energy Physics Spacetime 010308 nuclear & particles physics Isotropy General Physics and Astronomy Astronomy and Astrophysics 01 natural sciences Cosmology Gravitational energy Gravitation General Relativity and Quantum Cosmology 0103 physical sciences 010306 general physics Tensor density Mathematical physics |
| Zdroj: | Modern Physics Letters A. 36:2150125 |
| ISSN: | 1793-6632 0217-7323 |
| Popis: | 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-vector; the antisymmetric part is decomposed into “electric” and “magnetic” components. It is found that the gravitational field obeys a radiation-like equation of state, the antisymmetric part does not contribute to the gravitational energy–momentum; and the total energy density, the non-isotropic pressures and the heat-flux 4-vector vanish for spatially flat universes. Finally, it is verified that the field equations have a well-defined vacuum. |
| Databáze: | OpenAIRE |
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