Constraining stochastic gravitational wave background from weak lensing of CMB B-modes
- Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune-411007 (India)
- Department of Physics, Florida State University, Tallahassee, FL 32304 (United States)
A stochastic gravitational wave background (SGWB) will affect the CMB anisotropies via weak lensing. Unlike weak lensing due to large scale structure which only deflects photon trajectories, a SGWB has an additional effect of rotating the polarization vector along the trajectory. We study the relative importance of these two effects, deflection and rotation, specifically in the context of E-mode to B-mode power transfer caused by weak lensing due to SGWB. Using weak lensing distortion of the CMB as a probe, we derive constraints on the spectral energy density (Ω{sub GW}) of the SGWB, sourced at different redshifts, without assuming any particular model for its origin. We present these bounds on Ω{sub GW} for different power-law models characterizing the SGWB, indicating the threshold above which observable imprints of SGWB must be present in CMB.
- OSTI ID:
- 22679456
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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