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- W1979902946 abstract "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 syncrotron radiation emitted by cosmological distant radio sources. Without specifying the source of the dilaton-gravity, we study the dilaton-solution. We analyse the physical implications of this result in the Jordan-Fierz frame. We also analyse 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 gives us important effects concerning the background radiation.The optical activity in this case is also worked out and discussed." @default.
- W1979902946 created "2016-06-24" @default.
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- W1979902946 date "2005-02-14" @default.
- W1979902946 modified "2023-10-05" @default.
- W1979902946 title "Lorentz-breaking effects in scalar-tensor theories of gravity" @default.
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- W1979902946 doi "https://doi.org/10.1103/physrevd.71.044018" @default.
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