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Contribution of domain wall networks to the CMB power spectrum

Shellard, E. P. S.; Martins, C. J. A. P.; Lazanu, A.

We use three domain wall simulations from the radiation era to the late-time dark energy domination era based on the PRS algorithm to calculate the energy-momentum tensor components of domain wall networks in an expanding universe. Unequal time correlators in the radiation, matter and cosmological constant epochs are calculated using the scaling r…

Matter power spectra in viable f (R) gravity models with massive neutrinos

Geng, Chao-Qiang; Lee, Chung-Chi; Shen, Jia-Liang

We investigate the matter power spectra in the power law and exponential types of viable f (R) theories along with massive neutrinos. The enhancement of the matter power spectrum is found to be a generic feature in these models. In particular, we show that in the former type, such as the Starobinsky model, the spectrum is magnified much larger tha…