DJp.2.09 — Anisotropy in the Cosmic Microwave background As a Probe for early Universe magnetic field

Date & Time

Aug 10th at 6:00 PM until 6:00 PM




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Author(s): H. L. Duorah1

Institution(s): 1. Gauhati University Observatory

The cosmic background radiation is the remnant of the Big Bang stretched into the microwave region characterized by a temperature of 2.725K. The fluctuation in the background produces anisotropies and it is detected with amplitude of △T/T≈10-5 . Various effects like the Sachs-Wolfe effect, Sunyaev-Zel’ dovich effect are imprinted in this background. The effect of a primordial magnetic field in the plasma at the last scattering surface is examined here. The high magnetic field generated during the phase transition in the early universe is found to be too small to produce the observed anisotropy. However it can be surmised that the magnetic field being ubiquitous can be found in the plasma at the last scattering surface to contribute to the anisotropy. A magnetic field of about 10-2G may produce the desired effect.