Advances in High Energy Physics / 2014 / Article / Fig 1

Research Article

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

Figure 1

Evolution of the normalized wave amplitude as function of for RD (red lines) and RMD (black lines) background cosmic inventories. Results are for vanishing anisotropic stress, with (dotted lines), for (dashed lines) and for (solid lines). The RD curves are scale independent so that is given in units of . The RMD curves are correctly interpreted by observing that , which correspond to scales that have entered the Hubble horizon at the time of matter-radiation equality (see also Figure 7 for comparison). In spite of being more evident for the RMD scenario, in both situations the largely increasing values of result in a more relevant suppression of the tensor modes during the cosmological evolution. Notice that just for the first peak, solid lines are overpassing dashed- and dotted-lines.

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