Lorentz-breaking effects in scalar-tensor theories of gravity
- Departamento de Fisica, Universidade Federal da Paraiba, 58059-970, Joao Pessoa, PB (Brazil)
- Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-910, Rio de Janeiro, RJ (Brazil)
- Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, Urca 22290-180, Rio de Janeiro, RJ (Brazil)
In this work, we study the effects of breaking Lorentz symmetry in scalar-tensor theories of gravity taking torsion into account. We show that a space-time with torsion interacting with a Maxwell field by means of a Chern-Simons-like term is able to explain the optical activity in synchrotron radiation emitted by cosmological distant radio sources. Without specifying the source of the dilaton-gravity, we study the dilaton-solution. We analyze the physical implications of this result in the Jordan-Fierz frame. We also analyze the effects of the Lorentz-breaking in the cosmic string formation process. We obtain the solution corresponding to a cosmic string in the presence of torsion by keeping track of the effects of the Chern-Simons coupling and calculate the charge induced on this cosmic string in this framework. We also show that the resulting charged cosmic string yields important effects concerning the background radiation. The optical activity in this case is also worked out and discussed.
- OSTI ID:
- 20706024
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 4; Other Information: DOI: 10.1103/PhysRevD.71.044018; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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