Search Publications

Probing f(R) gravity with PLANCK data on cluster pressure profiles

Atrio-Barandela, F.; De Martino, I.; De Laurentis, M. +1 more

Analytical f(R)-gravity models introduce Yukawa-like corrections to the Newtonian potential in the weak field limit. These models can explain the dynamics of galaxies and cluster of galaxies without requiring dark matter. To test the model, we have computed the pressure profile of 579 X-ray galaxy clusters assuming the gas is in hydrostatic equili…

Fitting BICEP2 with defects, primordial gravitational waves and dust

Kunz, Martin; Liddle, Andrew R.; Lizarraga, Joanes +3 more

In this work we discuss the possibility of cosmic defects being responsible for the B-mode signal measured by the BICEP2 collaboration. We also allow for the presence of other cosmological sources of B-modes such as inflationary gravitational waves and polarized dust foregrounds, which might contribute to or dominate the signal. On the one hand, w…