Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario

Details Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario

2005-07-21

arxiv.org/abs/hep-th/0507210v3

Phys.Rev. D72 (2005) 066012

Physics

High Energy Physics

High Energy Physics - Theory

17 Pages, Latex, article revised, To appear in Physical Review D

Scientific paper

Rotation angle of the plane of polarization of the distant galactic radio waves has been estimated in a string inspired axion-dilaton background. It is found that the axion,dual to the field strength of the second rank antisymmetric massless Kalb-Ramond field in the string spectrum, produces a wavelength independent optical rotation which is much larger than that produced by the dilaton. Detection of such rotation has been reported in some recent cosmological experiments. The observed value has been compared with our estimated theoretical value following various cosmological constraints. The effects of warped extra dimensions in a braneworld scenario on such an optical rotation have been investigated.

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