Zobrazeno 1 - 10
of 6 327
pro vyhledávání: '"Silva, Marcos"'
In this work, we investigate the existence of wormholes within the framework of Loop Quantum Cosmology, considering isotropic dark matter as the matter source. We examine three distinct density profiles and employ modified field equations along with
Externí odkaz:
http://arxiv.org/abs/2411.12063
In the framework of Simpson-Visser, the search for field sources that produce black bounces in alternative gravity theories has remained unresolved. In this paper, the first in a series exploring sources for alternative theories of gravity, we identi
Externí odkaz:
http://arxiv.org/abs/2409.12101
Autor:
Pereira, Carlos F. S., Rodrigues, Denis C., Silva, Marcos V. de S., Fabris, Júlio C., Rodrigues, Manuel E., Belich, H.
In the present work, we obtain and analyze a new class of analytical solutions of magnetically charged black bounces in k-essence theory, spherically symmetric in (3+1)-dimensions, coupled to nonlinear electrodynamics (NED). We consider two metric mo
Externí odkaz:
http://arxiv.org/abs/2409.09182
When extending the SM, e.g. with vector-like quarks (VLQ), one inevitably encounters more than one CP violating complex phases. In this work, we develop a method useful in reducing the number of complex phases in scenarios with one and two VLQs. We s
Externí odkaz:
http://arxiv.org/abs/2407.07158
Publikováno v:
International Journal of Theoretical Physics (2024) 63:101
In this work, the trajectories of particles around a black bounce spacetime are considered, with the Simpson-Visser model serving as an example. Trajectories for massless and massive particles are obtained through the study of null and time-like geod
Externí odkaz:
http://arxiv.org/abs/2404.15792
Autor:
Alencar, G., Bronnikov, Kirill A., Rodrigues, Manuel E., Gómez, Diego Sáez-Chillón, Silva, Marcos V. de S.
Publikováno v:
Eur. Phys. J. C (2024) 84:745
One of the main issues in gravitation is the presence of singularities in the most common space-time solutions of General Relativity, as the case of black holes. A way of constructing regular solutions that remove spacelike singularities consists in
Externí odkaz:
http://arxiv.org/abs/2403.12897
Autor:
Guimarães, Vinícius Henrique Almeida, de Oliveira-Leandro, Maísa, Cassiano, Carolina, Marques, Anna Laura Piantino, Motta, Clara, Freitas-Silva, Ana Letícia, de Sousa, Marlos Aureliano Dias, Silveira, Luciano Alves Matias, Pardi, Thiago César, Gazotto, Fernanda Castro, Silva, Marcos Vinícius, Rodrigues Jr, Virmondes, Rodrigues, Wellington Francisco, Oliveira, Carlo Jose Freire
Publikováno v:
JMIR Public Health and Surveillance, Vol 7, Iss 1, p e24756 (2021)
BackgroundCOVID-19 is a highly transmissible illness caused by SARS-CoV-2. The disease has affected more than 200 countries, and the measures that have been implemented to combat its spread, as there is still no vaccine or definitive medication, have
Externí odkaz:
https://doaj.org/article/488ba150842c404a975c5c501b7f0cd6
Autor:
Silva, Marcos Antonio da
Publikováno v:
Veritas, Vol 65, Iss 3, p ID38430 (2020)
O artigo aplica tópicos do inferencialismo semântico de Brandom para iluminar o verificacionismo do Wittgenstein Intermediário, como o papel expressivista da negação, o holismo semântico do inferencialismo e a não redutibilidade de relações
Externí odkaz:
https://doaj.org/article/e144be182b4c4adf91a779e05fa92840
Autor:
Silva, Marcos Antonio da
Publikováno v:
Civitas - Revista de Ciências Sociais, Vol 18, Iss 3, Pp 699-717 (2018)
Este trabalho analisa as transformações políticas e econômicas em Cuba sob a atuação de Raúl Castro. Neste sentido, aponta os impactos da queda do socialismo real e a dinâmica de mudanças, necessárias, que se instaurou no país. Em seguida,
Externí odkaz:
https://doaj.org/article/8999183d72a94a3592a06afa54b89c46
Publikováno v:
JCAP05(2024)012
In Atazadeh and Hadi (JCAP \textbf{01}, 067 (2024)), the authors proposed that black bounce solutions, such as the Simpson-Visser and the Bardeen-type spacetimes, can be obtained from Rastall gravity. To achieve these spacetimes, the authors consider
Externí odkaz:
http://arxiv.org/abs/2402.17814