Zobrazeno 1 - 10
of 100
pro vyhledávání: '"S. C. Ulhoa"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 5, Pp 1-8 (2021)
Abstract The temperature associated with gravitation as presented in the Unruh effect and Hawking temperature serves to link different areas of physics, such as gravity, statistical mechanics, and quantum physics. In this paper, teleparallel gravity
Externí odkaz:
https://doaj.org/article/7d88ee18b7eb4da2b9bbf2eefdd2c7e0
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 1, Pp 1-9 (2021)
Abstract We consider non-linear plane gravitational waves as propagating space-time defects, and construct the Burgers vector of the waves. In the context of classical continuum systems, the Burgers vector is a measure of the deformation of the mediu
Externí odkaz:
https://doaj.org/article/5277e89d05814229a314ed13001fcf45
On the quantization of Burgers vector and gravitational energy in the space-time of a conical defect
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 3, Pp 1-9 (2020)
Abstract A conical topological defect is the result of translational and/or rotational deformations of spacetime, in particular the Burgers vector describes the translational deformation. Such a configuration represents a discontinuity, that cannot b
Externí odkaz:
https://doaj.org/article/0b2eb8b866924c9aa98f650d9a6b198c
Publikováno v:
Advances in High Energy Physics, Vol 2021 (2021)
In this work, we present an exact analysis of the two-dimensional noncommutative hydrogen atom. In this study, the Levi-Civita transformation was used to perform the solution of the noncommutative Schrodinger equation for Coulomb potential. As an imp
Externí odkaz:
https://doaj.org/article/85d377953a544d54ae3af78b9f2f689a
Publikováno v:
Advances in High Energy Physics, Vol 2020 (2020)
The two-dimensional hydrogen atom in an external magnetic field is considered in the context of phase space. Using the solution of the Schrödinger equation in phase space, the Wigner function related to the Zeeman effect is calculated. For this purp
Externí odkaz:
https://doaj.org/article/b1d019d34aaa48858535e0d09b2d048c
Autor:
A. X. Martins, R. A. S. Paiva, G. Petronilo, R. R. Luz, R. G. G. Amorim, S. C. Ulhoa, T. M. R. Filho
Publikováno v:
Advances in High Energy Physics, Vol 2020 (2020)
In this work, we study symplectic unitary representations for the Galilei group. As a consequence a nonlinear Schrödinger equation is derived in phase space. The formalism is based on the noncommutative structure of the star product, and using the g
Externí odkaz:
https://doaj.org/article/bea52d7321df40428ee314d05ba7e87a
Publikováno v:
Advances in High Energy Physics, Vol 2020 (2020)
The Thermo Field Dynamics (TFD) formalism is used to investigate the regular black holes at finite temperature. Using the Teleparalelism Equivalent to General Relativity (TEGR), the gravitational Stefan-Boltzmann law and the gravitational Casimir eff
Externí odkaz:
https://doaj.org/article/2ed2ad6fa3604b2387e2e877d6f0bace
Publikováno v:
Advances in High Energy Physics, Vol 2020 (2020)
The Dirac field, spin 1/2 particles, is investigated in phase space. The Dirac propagator is defined. The Thermo Field Dynamics (TFD) formalism is used to introduce finite temperature. The energy-momentum tensor is calculated at finite temperature. T
Externí odkaz:
https://doaj.org/article/66a8ae71ad6d405cb201a421db24396d
Publikováno v:
Advances in High Energy Physics, Vol 2019 (2019)
Gravitons are described by the propagator in teleparallel gravity in nearly flat space-time. Finite temperature is introduced by using Thermofield Dynamics formalism. The gravitational Casimir effect and Stefan-Boltzmann law are calculated as a funct
Externí odkaz:
https://doaj.org/article/6c72b71bb1e8488a9d899b0777ae7075
Publikováno v:
Advances in High Energy Physics, Vol 2018 (2018)
We use the scalar field constructed in phase space to analyze the analogous Stefan-Boltzmann law and Casimir effect, both of them at finite temperature. The temperature is introduced by Thermo Field Dynamics (TFD) formalism and the quantities are ana
Externí odkaz:
https://doaj.org/article/bc73b783c4d84467bd69c87079f9149b