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The so-called BSW effect is an idealised scenario for high-energy test particle collisions in the vicinity of black holes; if the black hole is extremal and one of the particles fine-tuned, the centre-of-mass collision energy can be arbitrarily high.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5ffc89c7acabc2e7da319597396033e
http://arxiv.org/abs/2202.13113
http://arxiv.org/abs/2202.13113
Autor:
Lemos, Jos�� P. S.
We analyze the Nobel prizes in physics for astrophysics and gravitation since the establishment of the prize and highlight the 2020 Nobel prize for black holes. In addition, we comment on the names that could have received the prize in astrophysics a
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2661da9cb4757afa473f0ec5a7478a21
http://arxiv.org/abs/2112.14346
http://arxiv.org/abs/2112.14346
Autor:
Rosa, Jo��o Lu��s, Lemos, Jos�� P. S.
The generalized hybrid metric-Palatini gravity is a theory of gravitation that has an action composed of a Lagrangian $f(R,\cal R)$, where $f$ is a function of the metric Ricci scalar $R$ and a new Ricci scalar $\cal R$ formed from a Palatini connect
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https://explore.openaire.eu/search/publication?articleId=doi_________::752a8c4809adcfbdbe0dc4324c5a765f
We find a specific coordinate system that goes from the Painlev��-Gullstrand partial extension to the Kruskal-Szekeres maximal extension and thus exhibit the maximal extension of the Schwarzschild metric in a unified picture. We do this by adopti
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https://explore.openaire.eu/search/publication?articleId=doi_________::46675795134608bf9f405e1ad45c14c0
For the celebrations of the 100 years of the observations undertaken by Eddington at the island of Principe and collaborators at Sobral during a total solar eclipse in May 29, 1919, which have confirmed Einstein's theory of general relativity through
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2d0ffffc25a82364980472a26aee77ba
http://arxiv.org/abs/1911.01959
http://arxiv.org/abs/1911.01959
Black holes are extreme spacetime deformations where even light is imprisoned. There is an extensive astrophysical evidence for the real and abundant existence of these prisons of matter and light in the Universe. Mathematically, black holes are desc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cac2c1a805eaba1464a2bb3690b78aba
http://arxiv.org/abs/1811.06587
http://arxiv.org/abs/1811.06587
WKB approximation methods are applied to the case of a massive scalar field around a 5-dimensional Reissner-Nordstr��m black hole. The divergences are explicitly isolated and the cancellation against the Schwinger-De Witt counter-terms proven. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::463c10fdcf0c362454cfd30c23ae4242
Autor:
Lemos, Jos�� P. S., Zanchin, Vilson T.
Buchdahl, by imposing a few physical assumptions on the matter, i.e., its density is a nonincreasing function of the radius and the fluid is a perfect fluid, and on the configuration, such as the exterior is the Schwarzschild solution, found that the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b78b254631c9f5acac9f9dc6aa0dd323
The thermodynamic equilibrium states of a static thin ring shell in a (2+1)-dimensional spacetime with a negative cosmological constant are analyzed. Inside the ring, the spacetime is pure anti-de Sitter (AdS), whereas outside it is a Ba\~nados-Teite
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0945ce07f4f672cd9e0a280c29b4ca89
http://arxiv.org/abs/1403.0579
http://arxiv.org/abs/1403.0579