Zobrazeno 1 - 10
of 149
pro vyhledávání: '"Luís C. B. Crispino"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-7 (2022)
Abstract We study the scattering of light-like geodesics and massless scalar waves by a static Konoplya–Zhidenko black hole, considering the case that the parametrized black hole solution contains a single deformation parameter. By performing a geo
Externí odkaz:
https://doaj.org/article/b524576fedfd43c0a6406025c6aca486
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 7, Pp 1-9 (2022)
Abstract We study the scattering of monochromatic planar scalar waves in a geometry that interpolates between the Schwarzschild solution, regular black holes and traversable wormhole spacetimes. We employ the partial waves approach to compute the dif
Externí odkaz:
https://doaj.org/article/7c8a09339f594350882609459ee02a2e
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 5, Pp 1-12 (2022)
Abstract Black holes can be inserted in very rich astrophysical environments, such as accretion disks. Although isolated black holes are simple objects in general relativity, their accretion disks may significantly enrich the field configurations of
Externí odkaz:
https://doaj.org/article/455dac2dfe14456b936067f9810f8728
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 12, Pp 1-9 (2021)
Abstract We investigate the absorption of planar massless scalar waves by a charged rotating stringy black hole, namely a Kerr–Sen black hole. We compute numerically the absorption cross section and compare our results with those of the Kerr–Newm
Externí odkaz:
https://doaj.org/article/ec150a3342ba4ba0a07508204b17cff2
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 11, Pp 1-12 (2020)
Abstract Obtaining solutions of the Einstein field equations describing spinning compact bodies is typically challenging. The Newman–Janis algorithm provides a procedure to obtain rotating spacetimes from a static, spherically symmetric, seed metri
Externí odkaz:
https://doaj.org/article/bf0c003d0df54e1c819c2361616ed17c
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 5, Pp 1-9 (2020)
Abstract Black holes are among the most intriguing objects in nature. They are believed to be fully described by General Relativity (GR), and the astrophysical black holes are expected to belong to the Kerr family, obeying the no-hair theorems. Alter
Externí odkaz:
https://doaj.org/article/645efd34d6fc454eaa8753f98ad0df38
Publikováno v:
Physics Letters B, Vol 795, Iss , Pp 496-501 (2019)
We investigate the scattering of a massless scalar field by a Kerr-Newman black hole, considering the case of on-axis incidence. We use the partial wave method to find numerical results for the scattering cross section, which we compare with classica
Externí odkaz:
https://doaj.org/article/42b4ce521fa5411f89a0eccc409e87ad
Publikováno v:
Revista Brasileira de Ensino de Física, Vol 43 (2020)
Neste artigo analisamos as sombras de buracos negros girantes de Kerr e a sua ligação com a primeira imagem de um buraco negro obtida pela colaboração internacional Telescópio Horizonte de Eventos. Obtemos analiticamente a sombra do buraco negro
Externí odkaz:
https://doaj.org/article/8cd75fb060894db5ab99e69f27b9c9e0
Autor:
Sérgio V. M. C. B. Xavier, Luiz C. S. Leite, Carolina L. Benone, Carlos A. R. Herdeiro, Luís C. B. Crispino
Publikováno v:
Revista Brasileira de Ensino de Física, Vol 42 (2020)
Resumo Buracos negros são regiões aprisionadas do espaço-tempo. A sua inexorável atração gravitacional determina que nada – nem mesmo a luz – pode escapar desta região. Logo, um buraco negro não pode ser observado diretamente. Tem de ser
Externí odkaz:
https://doaj.org/article/d31578c297dd49b4a2fe613a9c9e9013
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 2, Pp 1-11 (2018)
Abstract We investigate the radiation to infinity of a massless scalar field from a source falling radially towards a Schwarzschild black hole using the framework of the quantum field theory at tree level. When the source falls from infinity, the mon
Externí odkaz:
https://doaj.org/article/1dceb5f736274d80ba2c5e8cf45f8620