CνB Damping of Primordial Gravitational Waves and the Fine-Tuning of the CγB Temperature Anisotropy

Figure 5

Tensor contribution to the angular power spectrum in the RMD scenario. Results are for vanishing anisotropic stress (dotted lines), for (dashed lines), and for (solid lines) for the collisionless case. The blue line corresponds to the analytical results obtained for a vanishing anisotropic stress component, where we have used an analytical transfer function to account for RD and MD scenarios.