Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-01-28
JCAP 0406 (2004) 005
Physics
High Energy Physics
High Energy Physics - Theory
5 Pages,Revtex,No figure, version thoroughly revised, Accepted for publication in JCAP
Scientific paper
10.1088/1475-7516/2004/06/005
Following up on a recent paper by two of us (DM and SS), demonstrating the large enhancement in observable optical activity in radiation from high redshift sources arising from the string-based coupling of bulk Kalb-Ramond field to the Maxwell Chern Simons three-form on the brane in a Randall-Sundrum braneworld, we exhibit here a similar enhancement in parity-violating temperature-polarization correlations, yet unseen, in the CMB anisotropy due to a generalized parity-violating Kalb-Ramond axion-photon interaction proposed earlier by one of us (PM). The non-observation of such correlations in CMB anisotropies would necessitate unnatural fine tuning of the Kalb-Ramond axion parameters. As a stringy realization of Randall-Sundrum braneworld scenario is yet to be understood properly, our work indicates the need of a careful investigation to establish the connection between string-based phenomenological models and the Randall-Sundrum braneworld scenario
Maity Debaprasad
Majumdar Parthasarathi
SenGupta Soumitra
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