Zobrazeno 1 - 10
of 170
pro vyhledávání: '"P. D. Lima"'
Autor:
P. D. Lima, Vitória Jordana Bezerra Alencar, João Paulo Vieira Machado, Aécio Prado Lima Júnior, Maria Wilma da Silva Lima, Laryssa Oliveira Silva, Sheilla Conceição Gomes, Martha Rejane Souza Bispo, Ádrian Cabral Silva, Letícia Pereira Bezerra, Tatyane Martins Cirilo, Wandklebson Silva da Paz, Israel Gomes de Amorim Santos, Rosália Elen Santos Ramos
Publikováno v:
Journal of Water and Health, Vol 21, Iss 2, Pp 299-312 (2023)
Wastewater released into the environment without proper treatment contributes to the high prevalence of parasitic infections. We aimed to investigate the occurrence of parasites in sewage waters in both rainy and dry seasons in the city of Santana do
Externí odkaz:
https://doaj.org/article/fddd2cc996f7492c9301c7a32c8b09ff
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
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:
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
We analyze the quasinormal modes (QNMs) of a recently obtained solution of a Schwarzschild black hole (BH) with corrections motivated by Loop Quantum Gravity (LQG). This spacetime is regular everywhere and presents the global structure of a wormhole,
Externí odkaz:
http://arxiv.org/abs/2302.14722
Publikováno v:
Eur. Phys. J. C 82 (2022) 7, 638
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 differential
Externí odkaz:
http://arxiv.org/abs/2211.09886
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 their sur
Externí odkaz:
http://arxiv.org/abs/2205.13569
Autor:
Junior, Haroldo C. D. Lima, Yang, Jian-Zhi, Crispino, Luís C. B., Cunha, Pedro V. P., Herdeiro, Carlos A. R.
The light rings (LRs) topological charge (TC) of a spacetime measures the number of stable LRs minus the number of unstable LRs. It is invariant under smooth spacetime deformations obeying fixed boundary conditions. Asymptotically flat equilibrium bl
Externí odkaz:
http://arxiv.org/abs/2112.10802
Publikováno v:
Phys. Rev. D 104, 044018 (2021)
We investigate the null geodesic flow and in particular the light rings (LRs), fundamental photon orbits (FPOs) and shadows of a black hole (BH) immersed in a strong, uniform magnetic field, described by the Schwarzschilld-Melvin electrovacuum soluti
Externí odkaz:
http://arxiv.org/abs/2104.09577
Publikováno v:
Phys. Rev. D 103, 084040 (2021)
We consider the following question: may two different black holes (BHs) cast exactly the same shadow? In spherical symmetry, we show the necessary and sufficient condition for a static BH to be shadow-degenerate with Schwarzschild is that the dominan
Externí odkaz:
http://arxiv.org/abs/2102.07034