Enhanced polarization of CMB from thermal gravitational waves

@inproceedings{Bhattacharya2006EnhancedPO,
  title={Enhanced polarization of CMB from thermal gravitational waves},
  author={Kaushik Bhattacharya and Subhendra Mohanty and Akhilesh Nautiyal},
  year={2006}
}
If inflation was preceded by a radiation era then at the time of inflation there will exist a decoupled thermal distribution of gravitons. Gravitational waves generated during inflation will be amplified by the process of stimulated emission into the existing thermal distribution of gravitons. Consequently the usual zero temperature scale invariant tensor spectrum is modified by a temperature dependent factor. This thermal correction factor amplify the $B$-mode polarization of the CMB by an… 
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