Cosmic Birefringence within the Framework of Heterotic String Theory

Details Cosmic Birefringence within the Framework of Heterotic String Theory Cosmic Birefringence within the Framework of Heterotic String Theory

2000-11-22

arxiv.org/abs/hep-ph/0011279v2

Int.J.Mod.Phys. A16 (2001) 4011-4024

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 5 figures, revtex, minor changes, added references

Scientific paper

10.1142/S0217751X01004840

Low energy string theory predicts the existence of an axion field which can lead to cosmic birefringence. We solve the electromagnetic wave equations in the presence of such an axion and a dilaton field in order to determine their effect on the polarization of light. We find that the presence of dilaton field leads to a nontrivial modification of the final result. We comment on the possibility of discovering such an effect by observations of radio wave polarizations from distant radio galaxies and quasars. We have also determined the limits on the string theory parameters that are imposed by the current polarization data from distant quasars and radio galaxies.

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