2004/01/31 by Debaprasad Maity, Parthasarathi Majumdar, Soumitra SenGupta
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #hep-th
paper · pdf · doi:10.1088/1475-7516/2004/06/005
published as JCAP 0406 (2004) 005 · 5 Pages,Revtex,No figure, version thoroughly revised, Accepted for publication in JCAP
arxiv created 2004/06/02 · openalex publication_date 2004/06/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
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 red-shift 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, as 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 the Randall–Sundrum braneworld scenario is yet to be understood properly, our work indicates the need for a careful investigation to establish the connection between string-based phenomenological models and the Randall–Sundrum braneworld scenario.