Lorentz-breaking effects in scalar-tensor theories of gravity

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.

Effects of Linear Central Potential Induced by Lorentz Symmetry Violation framework and Cornell-type Non-electromagnetic Potential on Spin-0 Scalar Particles

“…The Lorentz-violating terms are generated as vacuum expectation values of tensors quantities, keeping the coordinate invariance of the extended theory [5]. This model has been scrutinized in many respects with the studies of fermion and gauge sectors, and gravitation extension [6,7,8,9,10,11,12,13,14,15], fermion systems and radiative corrections [16,17,18,19,20,21,22,23,24,25,26], CPT-probing experiments [27,28,29,30,31,32], the electromagnetic CPT-and Lorentz-odd term [33,34,35,36,37,38,39,40,41,42,43,44,45,46], and electromagnetic CPT-even and Lorentz-odd coefficients [47,48,49,50,51,…”

Traveling solitons in Lorentz andCPTbreaking systems

“…On the other hand, some impact over the standard model due to Lorentz and CPT symmetries were discussed by Colladay and Kostelecky [3,4]. Other problem analyzed in the literature is the spontaneous breaking of the four-dimensional Lorentz invariance of the QED [5]. At this point, it is interesting to mention that a space-time with torsion interacting with a Maxwell field by means of Chern-Simons-like term was introduced by the authors in Ref.…”

“…At this point, it is interesting to mention that a space-time with torsion interacting with a Maxwell field by means of Chern-Simons-like term was introduced by the authors in Ref. [5]. In this case, it is possible to explain the optical activity in the synchrotron radiation emitted by cosmological distant radio sources.…”

Supersymmetric Superfluid in a Lorentz-Violating Background

“…The global vortex behavior as a superfluid if the Kalb-Ramond field breaks Lorentz symmetry [17,15] in the background. In view of the possibility that Supersymmetry (SUSY) was realized in the early Universe, and it was broken approximately at the same time as cosmic strings were formed, many recent works investigate cosmic strings by adopting a supersymmetric framework [18,19,16].…”