2000/11/30 by Prasanta Kumar Das, Prasanta Das, Pankaj Jain +1 · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Axion #Cosmic string #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Dilaton #Galaxy #Geophysics and Gravity Measurements #Heterotic string theory #Particle physics #Physics #Polarization (electrochemistry) #Quantum electrodynamics #Quasar #String (physics) #Theoretical physics #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1142/s0217751x01004840
published as Int.J.Mod.Phys. A16 (2001) 4011-4024 · 11 pages, 5 figures, revtex, minor changes, added references
arxiv created 2001/02/24 · openalex publication_date 2001/09/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 radio polarization data.