https://doi.org/10.1140/epjc/s10052-018-5927-5
Regular Article - Theoretical Physics
Some results on a black hole with a global monopole in Poincaré gravity
1
Departamento de Física, Universidade Federal da Paraíba, Caixa Postal 5008, João Pessoa, PB, 58059-970, Brazil
2
Núcleo de Estudos em Física, Instituto Federal de Educação, Ciência e Tecnologia Fluminense, Rua Dr Siqueira 273, Campos dos Goytacazes, RJ, 28030-130, Brazil
* e-mail: valdir@fisica.ufpb.br
Received:
3
April
2018
Accepted:
23
May
2018
Published online:
4
June
2018
The aim of this work is to study the thermodynamics and spin current of a system corresponding to a black hole containing a global monopole in the context of Poincaré gravity theory which is an extension of general relativity, in the sense that the intrinsic angular momentum of matter is also a source of gravitational interaction. Thus, in this work we find the solution corresponding to the spacetime under consideration by taking into account that the action which describes this system contains terms corresponding to the curvature and torsion. The metric obtained is a function of mass, solid angle deficit and the coupling constants of the quadratic terms of the curvature and torsion. In this model, the stability of the system is studied through the analysis of the Hawking temperature and the specific heat. In this context it was also studied the critical temperatures of the system considering positive or negative cosmological constant. In the vicinity of the black hole with a global monopole, where there is a logarithmic correction due to the relationship between the torsion and curvature fields, some analysis were done. We also study the AdS/dS limit where the black hole is analyzed from the topological point of view. Although the effect of spin current density at low energies is negligible, in the vicinity of strong gravitational fields it can generate an appreciable effect due to spin gravity coupling.
© The Author(s), 2018
