Zobrazeno 1 - 10
of 1 852
pro vyhledávání: '"C. A Lima"'
Autor:
Magalhães, Renan B., Ribeiro, Gabriel P., Junior, Haroldo C. D. Lima, Olmo, Gonzalo J., Crispino, Luís C. B.
We show that the absence of unbounded algebraic curvature invariants constructed from polynomials of the Riemann tensor cannot guarantee the absence of strong singularities. As a consequence, it is not sufficient to rely solely on the analysis of suc
Externí odkaz:
http://arxiv.org/abs/2401.12779
Autor:
Ivna G C V Lima, Jairo T Nunes, Igor H de Oliveira, Silvia M A Ferreira, Robinson T Munhoz, Paulo R Chizzola, Bruno Biselli, Brenno R Gomes, Lucas P Damiani, André S Maria, Fernanda Ronco, Edimar Alcides Bocchi
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-10 (2024)
Abstract Observational studies suggest a U-shaped association between serum potassium (K⁺) levels and mortality in patients with chronic heart failure (CHF). However, the mode of death in patients with HF and K⁺ disorders remains speculative. To
Externí odkaz:
https://doaj.org/article/42f6c6a6e0f64fd08f6a5ec9be484745
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 12, Pp 1-12 (2024)
Abstract Examining the $$\phi ^{4}$$ ϕ 4 and $$\phi ^{8}$$ ϕ 8 models within a two-dimensional framework in the flat spacetime and embracing a theory with unconventional kinetic terms, one investigates the emergence of kinks/antikinks and double-ki
Externí odkaz:
https://doaj.org/article/e371611b75a1427cb1c8d7c0622ee239
Publikováno v:
Geoscientific Model Development, Vol 17, Pp 8115-8139 (2024)
Drought is a complex climatic phenomenon characterised by water scarcity and is recognised as the most widespread and insidious natural hazard, posing significant challenges to ecosystems and human society. In this study, we propose a new daily based
Externí odkaz:
https://doaj.org/article/64548d76129646c8a91891b70c408900
Publikováno v:
Earth System Dynamics, Vol 15, Pp 1385-1400 (2024)
Humans change climate in many ways. In addition to greenhouse gases, climate models must therefore incorporate a range of other forcings, such as land use change. While studies typically investigate the joint effects of all forcings, here we isolate
Externí odkaz:
https://doaj.org/article/12c0165f5e954e1fa8d940fe9c874250
Within nonlinear electrodynamics (NED), photons follow null geodesics of an effective geometry, which is different from the geometry of the spacetime itself. Over the last years, several works were dedicated to investigate the motion of photons in th
Externí odkaz:
http://arxiv.org/abs/2305.04776
Publikováno v:
Vertebrate Zoology, Vol 74, Iss , Pp 533-550 (2024)
Abstract The miniature fish genus Priocharax currently comprises seven valid species: P. ariel, P. britzi, P. marupiara, P. nanus, P. pygmaeus, P. toledopizae and P. varii. Except for P. ariel and P. pygmaeus, all the species are endemic to Brazil. P
Externí odkaz:
https://doaj.org/article/45b91514f5ed465d83b88eaf62f2602e
Autor:
Valdir Barbosa Bezerra, Herondy Francisco Santana Mota, Augusto P. C. M. Lima, Geová Alencar, Celio Rodrigues Muniz
Publikováno v:
Physics, Vol 6, Iss 3, Pp 1046-1071 (2024)
In this paper, we review some recent findings related to the Casimir effect. Initially, the thermal corrections to the vacuum Casimir energy density are calculated, for a quantum scalar field, whose modes propagate in the (3+1)-dimensional Euclidean
Externí odkaz:
https://doaj.org/article/c22ae85d8ef843769bc133be1d7c861b
Autor:
Cassiano Gustavo Messias, Cláudio A. de Almeida, Daniel E. Silva, Luciana S. Soler, Luis E. Maurano, Vagner L. Camilotti, Fábio C. Alves, Libério J. da Silva, Mariane S. Reis, Thiago C. de Lima, Vivian Renó, Deborah L. C. Lima, Amanda P. Belluzzo, Camila B. Quadros, Delmina C. M. Barradas, Douglas R. V. de Moraes, Eduardo F. M. Bastos, Igor P. Cunha, Jefferson J. de Souza, Lucélia S. de Barros, Luiz Henrique A. Gusmão, Rodrigo de Almeida, Dayane R. V. de Moraes, Diego M. Silva, Eduardo H. S. Chrispim, João Felipe S. K. C. Pinto, Manoel R. Ribeiro Neto, Marlon Henrique H. Matos, Noeli Aline P. Moreira, Raíssa C. dos S. Teixeira, Gabriel M. R. Alves, Ana Carolina S. de Andrade, Letícia P. Perez, Bruna Maria P. Bento, Hugo C. de Castro Filho, Igor S. dos Santos, Liliane Cristina L. de Araújo, Maira Matias, Murilo B. da Silva, Fábio da C. Pinheiro, André Carvalho, Haron Xaud, Maristela Xaud, Ana Paula Matos, Luis Baumann, Elaine B. da Silva, Laerte Guimarães Ferreira, Marcos Adami
Publikováno v:
Communications Earth & Environment, Vol 5, Iss 1, Pp 1-9 (2024)
Abstract The Brazilian Amazon Satellite Monitoring Program (PRODES Amazonia) tracks forest loss in the Brazilian Amazon but excludes about 6.6% ( ~ 280,000 km²) of non-forest vegetation (NF). Here we developed the PRODES NF system to address this ga
Externí odkaz:
https://doaj.org/article/a655e299e61548afabef5b4430ea81cc
Publikováno v:
Phys. Rev. D 107, 064040 (2023)
We investigate the shadow of an exact black hole solution of Einstein's equations recently proposed by Cardoso et al., to describe a supermassive black hole immersed in a dark matter halo. We analyze and discuss the light rings and the gravitational
Externí odkaz:
http://arxiv.org/abs/2303.17666