Zobrazeno 1 - 10
of 148
pro vyhledávání: '"Pedro F. González-Díaz"'
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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The entropy and Mandel function as entanglement predictable of multipartite entangled coherent states are studied. The possibility of using these states as quantum channel to perform quantum teleportation is investigated. Quantum teleportation is ach
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d050a728ea68aad915198bf67b77b244
https://doi.org/10.1007/s11128-013-0551-7
https://doi.org/10.1007/s11128-013-0551-7
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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In this paper we study the accretion of dark energy onto a black hole in the cases that dark energy is equipped with a positive cosmological constant and when the space-time is described by a Schwarzschild-de Sitter metric. While the first case is th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e44a210037211855039b87fc372ee4e
https://doi.org/10.1007/s10714-009-0808-8
https://doi.org/10.1007/s10714-009-0808-8
Publikováno v:
Gravitation and Cosmology. 14:205-212
Recently it was found that dark energy in the form of phantom generalized Chaplygin gas may lead to a new form of the cosmic doomsday, the big freeze singularity. Like the big rip singularity, the big freeze singularity would also take place at a fin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c91bf000ee96d044dbf5cc1344318fa
https://doi.org/10.1134/s0202289308030018
https://doi.org/10.1134/s0202289308030018
Autor:
Pedro F. González-Díaz
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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In this Letter we consider a warp drive spacetime where the spaceship can only travel faster than light. Restricting to the two-dimensional case, we find that if the warp drive is placed in an accelerating universe the warp bubble size increases in a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bdd630c61bac86b3e368cf81fef297e7
https://doi.org/10.1016/j.physletb.2007.09.041
https://doi.org/10.1016/j.physletb.2007.09.041
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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This paper contains a detailed discussion on new cosmic solutions describing the early and late evolution of a universe that is filled with a kind of dark energy that may or may not satisfy the energy conditions. The main distinctive property of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94f8b6a03c8afd0acc02661fed3b2f48
https://doi.org/10.1016/j.nuclphysb.2006.10.021
https://doi.org/10.1016/j.nuclphysb.2006.10.021
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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By using an unmodified Einstein gravity theory it is shown that all of the speeding-up effects taking place in the current universe are entirely due to the quantum effects associated with the background radiation or to the combination of such effects
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4720dffb478f071b679331093f4e88cd
https://doi.org/10.1016/j.physletb.2006.08.040
https://doi.org/10.1016/j.physletb.2006.08.040
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
instname
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It is argued that the accretion of phantom energy onto a wormhole in a universe with a positive cosmological constant leads also to a gradual increase of the wormhole throat radius, which eventually overtakes the super-accelerated expansion of the un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b71609b16f4d64b9173c96c08d45483
https://doi.org/10.1142/s021827180500705x
https://doi.org/10.1142/s021827180500705x
Autor:
Pedro F. González-Díaz
Publikováno v:
International Journal of Modern Physics D. 14:1313-1320
Dimming mechanisms based on the conversion of photons into axions have been recently suggested which could justify the observation of equation of state values w = P/ρ less than -1 that do not correspond to the presence of phantom energy in the unive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33b258e69042361a43b76e12ba80d4a8
https://doi.org/10.1142/s0218271805006973
https://doi.org/10.1142/s0218271805006973
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
instname
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This paper deals with the thermodynamic properties of a phantom field in a flat Friedmann-Robertson-Walker universe. General expressions for the temperature and entropy of a general dark-energy field with equation of state p=ωρ are derived from whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2acacac936ceb3778b504f7f48468443
https://doi.org/10.1016/j.nuclphysb.2004.07.020
https://doi.org/10.1016/j.nuclphysb.2004.07.020
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
instname
instname
10 pags., 5 figs. -- PACS: 04.60.-m; 98.80.Cq
Primordial inflation is regarded to be driven by a phantom field which is here implemented as a scalar field satisfying an equation of state p=ωρ, with ω
This work wassupported by DGICYT unde
Primordial inflation is regarded to be driven by a phantom field which is here implemented as a scalar field satisfying an equation of state p=ωρ, with ω
This work wassupported by DGICYT unde
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0195280a0ae3dc463c35eabb72b68f7