Nota de FísicaPublicado
Superconducting Cosmic String in Minimal Einstein-Cartan Gravity
C. N. Ferreira; Herman J. Mosquera Cuesta; Luiz C.G. de Andrade
2000
Dados da publicação
- Autores
- C. N. Ferreira; Herman J. Mosquera Cuesta; Luiz C.G. de Andrade
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 2000
- Descrição
- We show that it is possible to construct a consistent model describing a current-carrying cosmic string endowed with torsion and curvature in four dimensions. The string torsion is interpreted in analogy with screw dislocations in a three-dimensional crystalline solid. In the simplest case the torsion can be written as a real scalar field gradient that preserves the skew-symmetry. We consider a superconducting cosmic string (SCCS) in Einstein-Cartan theory of gravity. A solution representing a superconducting cosmic string was found by considering the weak-field approximation while the exterior solution was derived in an exact manner. The torsion contribution to the gravitational force and geodesics of a test-particle moving around the SCCS are analyzed. In particular, we point out two interesting astrophysical phenomena in which the higher magnitude force we derived may play a critical role: the dynamics of compact objects orbiting the screwed SCCS and accretion of matter onto it. The deficit angle associated to the SCCS can be obtained and compared with data from the Cosmic Background Explorer (COBE) satellite. We also derived a value for the torsion contribution to matter density fluctuations in the early Universe.
- Ano
- 2000
- Número
- CBPF-NF-021/00
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não