Zobrazeno 1 - 10
of 2 073
pro vyhledávání: '"F Dias"'
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., Rubiera-Garcia, Diego, da Silva, Luís F. Dias, Vieira, Henrique A.
We consider a recently introduced extension of General Relativity dubbed as Cotton gravity (CG), based on the use of the Cotton tensor, to estimate the size of a new constant $\gamma$ appearing within a spherically symmetric, vacuum solution of the t
Externí odkaz:
http://arxiv.org/abs/2407.21655
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., Rubiera-Garcia, Diego, da Silva, Luís F. Dias, Vieira, Henrique A.
Recently, J. Harada proposed a theory relating gravity to the Cotton tensor, dubbed as ''Cotton gravity'' (CG). This is an extension of General Relativity such that every solution of the latter turns out to be a solution of the former (but the conver
Externí odkaz:
http://arxiv.org/abs/2407.21649
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., Rubiera-Garcia, Diego, da Silva, Luís F. Dias, Vieira, Henrique A.
In this work, we study timelike and lightlike geodesics in Kalb-Ramond (KR) gravity around a black hole with the goal of constraining the Lorentz symmetry-breaking parameter $l$. The analysis involves studying the precession of the S2 star periastron
Externí odkaz:
http://arxiv.org/abs/2405.03291
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., Rubiera-Garcia, Diego, da Silva, Luís F. Dias, Vieira, Henrique A.
Publikováno v:
Phys. Rev. D 110, 024077 (2024)
In this paper, we investigate the gravitational lensing effect for the Schwarzschild-like black hole spacetime in the background of a Kalb-Ramond (KR) field proposed in [K. Yang et. al., Phys. Rev. D 108 (2023) 124004]. The solution is characterized
Externí odkaz:
http://arxiv.org/abs/2405.03284
Autor:
Junior, Ednaldo L. B., Junior, José Tarciso S. S., Lobo, Francisco S. N., Rodrigues, Manuel E., da Silva, Luís F. Dias, Vieira, Henrique A.
The geodesic method has played a crucial role in understanding the circular orbits generated by compact objects, culminating in the definition of the photon sphere, which was later generalized to a photon surface in arbitrary spacetimes. This new for
Externí odkaz:
http://arxiv.org/abs/2401.01821
Publikováno v:
Phys. Rev. D 108, 084055 (2023)
The imaging by the Event Horizon Telescope (EHT) of the supermassive central objects at the heart of the M87 and Milky Way (Sgr A$^\star$) galaxies, has marked the first step into peering at the photon rings and central brightness depression that cha
Externí odkaz:
http://arxiv.org/abs/2307.06778
Autor:
Hans F. Dias, Jessie Fanglu Fu, Trevor G. Luck, Grace E. Wolfe, Emma R. Hostetter, Nathan C. Ng, Hui Zheng, Willem M. Kühtreiber, Julie C. Price, Ciprian Catana, Denise L. Faustman
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-15 (2024)
Abstract The Bacillus Calmette-Guérin (BCG) vaccine, which has been used for > 100 years to prevent tuberculosis, is well-established for bladder cancer treatment, and under study for neurological and autoimmune diseases. In patients with type 1 dia
Externí odkaz:
https://doaj.org/article/d6681be91f1a40a39da78f60901d778e
Publikováno v:
Geoconservation Research, Vol 7, Iss 1, Pp 69-88 (2024)
The Maricá Coastal Plain, in the state of Rio de Janeiro, Brazil, is formed by a sandy barrier system, up to 120,000 BP, covered by Atlantic Forest coastal vegetation. Its central area is designated as the Environmental Protection Area (APA) of Mari
Externí odkaz:
https://doaj.org/article/6cac9fe2257b4b9395e9203b65702893
Autor:
Julia Forato, Cássio A. Meira, Ingra M. Claro, Mariene R. Amorim, Gabriela F. de Souza, Stefanie P. Muraro, Daniel A. Toledo-Teixeira, Miguel F. Dias, Cátia A. R. Meneses, Rodrigo N. Angerami, Pritesh Lalwani, Scott C. Weaver, Ester C. Sabino, Nuno R. Faria, William M. de Souza, Fabiana Granja, José Luiz Proenca-Modena
Publikováno v:
Emerging Infectious Diseases, Vol 30, Iss 5, Pp 1013-1016 (2024)
We detected Mayaro virus (MAYV) in 3.4% (28/822) of febrile patients tested during 2018–2021 from Roraima State, Brazil. We also isolated MAYV strains and confirmed that these cases were caused by genotype D. Improved surveillance is needed to bett
Externí odkaz:
https://doaj.org/article/33b9f04d8f51456989d6ba3a563ba463