2012

New limit on pseudoscalar-photon mixing from WMAP Observations

Tiwari, Prabhakar

Understand

The pseudoscalar-photon mixing in presence of large scale magnetic field induces polarization in light from distant cosmological sources.

  • We study the effect of these pseudoscalars or axion like particles (ALPs) on Cosmic Microwave Background Radiation (CMBR) and constrain the product of mixing strength $g_{\phi}$ times background magnetic field $B$.
  • The background magnetic field has been assumed to be primordial and we assume large scale correlations with the correlation length of 1Mpc.
  • We use WMAP seven year foreground reduced polarization and temperature data to constrain pseudoscalar-photon mixing parameter.

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