Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-10-06
Phys.Rev.D67:084011,2003
Physics
High Energy Physics
High Energy Physics - Theory
Revised version, to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.67.084011
Measurements of radio emission from distant galaxies and quasars verify that the polarization vectors of these radiations are not randomly oriented as naturally expected. This peculiar phenomenon suggests that the spacetime intervening between the source and observer may be exhibiting some sort of optical activity, the origin of which is not known. In the present paper we provide a plausible explanation to this phenomenon by investigating the r\^ole played by a Chern-Simons-like term in the background of an ordinary or superconducting screwed cosmic string in a scalar-tensor gravity. We discuss the possibility that the excess in polarization of the light from radio-galaxies and quasars can be understood as if the electromagnetic waves emitted by these cosmic objects interact with a scalar-tensor screwed cosmic string through a Chern-Simons coupling. We use current astronomical data to constrain possible values for the coupling constant of this theory, and show that it turns out to be: $\lambda \sim 10^{-26}$ eV, which is two orders of magnitude larger than in string-inspired theories.
Bezerra Valdir B.
Ferreira Cristine N.
Mosquera Cuesta Herman J.
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