JAPC - CMB and Fundamental Physics

Speaker: Dr. Meir Shimon, Center for Astrophysics and Space Sciences, University of California, San Diego.

Topic: "CMB and Fundamental Physics"

Time: 2:00 PM, Friday, October 2nd, 2009

Place: P-148 (refreshments will be served at 1:30 PM in P145A)

Abstract: The small temperature anisotropy and polarization of the cosmic microwave background (CMB) radiation have been the target of numerous earth-based, baloon-born and satellite missions in the last two decades. Upcoming CMB experiments, equipped with higher sensitivity and better angular resolution, will provide us with high fidelity probes of CMB polarization state and secondaries, such as comptonization of the CMB by the Sunyaev-Zeldovich (SZ) effect.

The CMB is essentially a snapshot of the universe at recombination and carries a valuable information about a much earlier process, cosmological inflation. Secondary effects that took place billion of years later, at redshifts of a few, such as gravitational lensing of the CMB by the intervening large scale structure and the SZ effect provide us with cosmological bounds on neutrino masses and chemical potentials as well as the dark energy equation-of-state. Rotation of the CMB polarization-plane, due to non-standard coupling of the electromagnetic field to other scalar fields, 'cosmological birefringence', can be used to set limits on the axion mass and coupling to electromagnetic fields. Finally, spectral distortions in the SZ effect can be used to constrain non-standard scalings of the CMB temperature with redshift.

Hosted by: Prof. William Welsh.

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