Photon-Axion mixing in an inhomogeneous universe
arXiv:astro-ph/0207525 · doi:10.1016/S0370-2693(03)00641-5
Abstract
We consider the dimming of photons from high redshift type 1a supernovae by mixing with a pseudoscalar axion field in the intergalactic medium. We model the electron density using a lognormal probability distribution and assume frozen in magnetic fields. Assuming the magnetic fields are produced in the early universe we are unable to obtain sufficient dimming in order to explain the apparent acceleration without violating the bounds on the frequency dependence of the dimming. We also show that any axion mixing leading to a reduction in optical luminosities would also lead to a significant reduction in the polarisation of UV light from intermediate redshift objects which may be detected in the future.
14 pages, 5 figures. Density matrix method implemented. Main results unchanged. Accepted in PLB
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