School's Weekly Seminar
The Generation of B-Mode and Circular Polarization of Cosmic Photons due to NonCommutative Space-Time Background
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Asia/Tehran
Particles and Accelerators School Seminar Room (Larak)
Particles and Accelerators School Seminar Room
Larak
Institute for Research in Fundamental Sciences, Larak Garden, Artesh Hwy, Tehran, Iran
Description
In standard model of cosmology, B-mode polarization of the Cosmic Microwave Background cannot be generated by Compton scattering in the presence of scalar mode of matter perturbations. However it is possible to have B-mode by Compton scattering due to tensor mode of matter perturbations which is related to gravitational effects in the inflation epoch. We consider Compton scattering in noncommutative framework and show that Compton scattering in presence of non-commutative background and scalar mode of perturbation, beside generating a circularly polarized microwave, can leads to a B-mode polarization of the Cosmic Microwave Background . We also discuss generation of the circular polarization of the Gamma Ray Bursts photons via their interactions with astro-particles.