Signatures of Pseudoscalar Photon Mixing in CMB Radiation

Details Signatures of Pseudoscalar Photon Mixing in CMB Radiation Signatures of Pseudoscalar Photon Mixing in CMB Radiation

2008-07-29

arxiv.org/abs/0807.4587v1

Phys.Rev.D78:085028,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 5 figures

Scientific paper

10.1103/PhysRevD.78.085028

We model the effect of photon and ultra-light pseudoscalar mixing on the propagation of electromagnetic radiation through the extragalactic medium. The medium is modelled as a large number of magnetic domains, uncorrelated with one another. We obtain an analytic expression for the different Stokes parameters in the limit of small mixing angle. The different Stokes parameters are found to increase linearly with the number of domains. We also verify this result by direct numerical simulations. We use this formalism to estimate the effect of pseudoscalar-photon mixing on the Cosmic Microwave Background (CMB) polarization. We impose limits on the model parameters by the CMB observations. We find that the currently allowed parameter range admits a CMB circular polarization up to order $10^{-7}$.

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