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pro vyhledávání: '"Maciel, Alan"'
Autor:
Maciel, Alan S., Zanchin, Vilson T.
The findings discussed in "Apparent Horizons of the Thakurta Spacetime and the Description of Cosmological Black Holes" deviate from prior research, particularly our study in Phys. Rev. D 95, 084031 (2017). We clarify this inconsistency, which arises
Externí odkaz:
http://arxiv.org/abs/2407.06365
We explore in detail the 2+2 and 1+1+2 formalism in spherically symmetric spacetimes, spanning from deducing the dynamical equations to relating them to the well-known generalised Painlev\'e-Gullstrand (GPG) coordinate system. The evolution equations
Externí odkaz:
http://arxiv.org/abs/2405.09968
The TOV equation appears as the relativistic counterpart of the classical condition for hydrostatic equilibrium. In the present work we aim at showing that a generalised TOV equation also characterises the equilibrium of models endowed with other sym
Externí odkaz:
http://arxiv.org/abs/1910.13225
Publikováno v:
Phys. Rev. D 100, 104050 (2019)
We study a class of charged cosmological black holes defined by the Shah-Vaidya solution, which is similar to the McVittie solution but for a central object of nonzero electric charge. We show that the Shah-Vaidya metric is a solution of Einstein's e
Externí odkaz:
http://arxiv.org/abs/1908.04961
Publikováno v:
Phys. Rev. D 98, 024016 (2018)
The Birkhoff theorem is a well-known result in general relativity and it is used in many applications. However, its most general version, due to Bona, is almost unknown and presented in a form less accessible to the relativist and cosmologist communi
Externí odkaz:
http://arxiv.org/abs/1803.11547
Autor:
Maciel, Alan Claudius
Publikováno v:
Repositório Institucional da UFABCUniversidade Federal do ABCUFABC.
Orientador: Prof. Dr. Claudio nogueira de Meneses
Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Ciência da Computação, 2015.
Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Ciência da Computação, 2015.
Externí odkaz:
http://www.biblioteca.ufabc.edu.brhttp://biblioteca.ufabc.edu.br/index.php?codigo_sophia=100859
Publikováno v:
Phys. Rev. D 95, 084031 (2017)
A class of nonstationary spacetimes is obtained by means of a conformal transformation of the Schwarzschild metric, where the conformal factor $a(t)$ is an arbitrary function of the time coordinate only. We investigate several situations including so
Externí odkaz:
http://arxiv.org/abs/1611.05077
Autor:
Maciel, Alan
Publikováno v:
Phys. Rev. D 93, 104013 (2016)
Theories of gravity with a preferred foliation usually display arbitrarily fast signal propagation, changing the black hole definition. A new inescapable barrier, the universal horizon, has been defined and many static and spherically symmetric examp
Externí odkaz:
http://arxiv.org/abs/1511.08663
Publikováno v:
Phys. Rev. D 92, 083525 (2015)
In this work we revisit the definition of Matter Trapping Surfaces (MTS) introduced in previous investigations and show how it can be expressed in the so-called dual null formalism developed for Trapping Horizons (TH). With the aim of unifying both a
Externí odkaz:
http://arxiv.org/abs/1506.07122
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