Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Juan Antonio Morales-Lladosa"'
Publikováno v:
Universe, Vol 10, Iss 7, p 299 (2024)
A relativistic positioning system is a set of four emitters broadcasting their proper times by means of light signals. The four emitter times received at an event constitute the emission coordinates of the event. The covariant quantities associated w
Externí odkaz:
https://doaj.org/article/0b4ce5ed626c4d42be7ed3984a84e077
Publikováno v:
Universe, Vol 10, Iss 4, p 179 (2024)
Our starting point is the covariant coordinate transformation equation of a relativistic positioning system in Minkowski space–time that maps the receiver’s emission coordinates (proper times broadcast by the emitters) to its coordinates in some
Externí odkaz:
https://doaj.org/article/5b16f52887e74b5cb8c819c017380369
Publikováno v:
Universe, Vol 9, Iss 6, p 286 (2023)
We conduct a detailed study of the electromagnetic field produced by a massive point particle undergoing hyperbolic (uniformly accelerated) motion in Minkowski space-time. Starting from the Liénard–Wiechert solution and using a covariant notation,
Externí odkaz:
https://doaj.org/article/3404174bd3234104a57490b180ff905b
The temperature measurements, $T$, of the perturbed cosmic microwave background, performed by the cosmic background explorer satellite (COBE), are considered. A dichotomist function, $f = \pm 1$, is defined such that $f =+1$ if $\delta T > 0$ and $f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7d6a3ced791434b7dc67cee04daa8e8
Publikováno v:
Lapiedra Civera, Ramón Morales Lladosa, Juan Antonio 2019 Solutions of the Einstein field equations for a bounded and finite discontinuous source, and its generalization: Metric matching conditions and jumping effects Physical Review D 100 6 064045-1 064045-10
RODERIC. Repositorio Institucional de la Universitat de Valéncia
instname
RODERIC. Repositorio Institucional de la Universitat de Valéncia
instname
We consider the metrics of the General Relativity, whose energy-momentum tensor has a bounded support where it is continuous except for a finite step across the corresponding boundary surface. As a consequence, the first derivative of the metric acro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15242cc71736010f04095b35a948fe53
https://doi.org/10.1103/physrevd.100.064045
https://doi.org/10.1103/physrevd.100.064045
Publikováno v:
Lapiedra Civera, Ramón Morales Lladosa, Juan Antonio 2017 Cosmic censorship conjecture in some matching spherical collapsing metrics Physical Review D 95 064025-1 064025-11
RODERIC. Repositorio Institucional de la Universitat de Valéncia
instname
RODERIC. Repositorio Institucional de la Universitat de Valéncia
instname
A physically plausible Lema{\^{\i}}tre-Tolman-Bondi collapse in the marginally bound case is considered. By "physically plausible" we mean that the corresponding metric is ${\cal C}^1$ matched at the collapsing star surface and further that its {\em
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0689e236ea64b8abc66a5c5fbe783e30
http://hdl.handle.net/10550/68480
http://hdl.handle.net/10550/68480
The collapse of marginally bound, inhomogeneous, pressureless (dust) matter, in spherical symmetry, is considered. The starting point is not, in this case, the integration of the Einstein equations from some suitable initial conditions. Instead, star
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50933d157e85e35b7b436ba5a26084b2
Publikováno v:
General Relativity and Gravitation. 44:367-389
We present a new approach to the question of properly defining energy and momenta for non asymptotically Minkowskian spaces in general relativity, in the case where these energy and momenta are conserved. In order to do this, we first prove that ther
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66030d178de86b5cbb781b2f2fe85670
https://doi.org/10.1007/s10714-011-1283-6
https://doi.org/10.1007/s10714-011-1283-6
Publikováno v:
Foundations of Physics. 39:1280-1295
The causal characters (spacelike, lightlike, timelike) of the coordinate lines, coordinate surfaces and coordinate hypersurfaces of a coordinate system in Relativity define what is called its causal class. It is known that, in any relativistic space-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c92e8d1846d7008ed5d9179a9141fb9b
https://doi.org/10.1007/s10701-009-9353-2
https://doi.org/10.1007/s10701-009-9353-2
Publikováno v:
General Relativity and Gravitation. 47
The Einstein field equations for any spherically symmetric metric and a geodesic perfect fluid source are cast in a canonical simple form, both for Lorentzian metrics and for instantons. Both kinds of metrics are explicitly written for the Lema{\^{\i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95f9919b44eacff2fb9e3e70aabc1ee9
https://doi.org/10.1007/s10714-015-1946-9
https://doi.org/10.1007/s10714-015-1946-9