Damping of tensor modes in cosmology

@article{Weinberg2004DampingOT,
  title={Damping of tensor modes in cosmology},
  author={Steven Weinberg},
  journal={Physical Review D},
  year={2004},
  volume={69},
  pages={023503}
}
  • S. Weinberg
  • Published 16 June 2003
  • Physics
  • Physical Review D
An analytic formula is given for the traceless transverse part of the anisotropic stress tensor due to free streaming neutrinos, and used to derive an integro-differential equation for the propagation of cosmological gravitational waves. The solution shows that anisotropic stress reduces the squared amplitude by 35.6% for wavelengths that enter the horizon during the radiation-dominated phase, independent of any cosmological parameters. This decreases the tensor temperature and polarization… 
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