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Proposing Institution

Argelander-Institut fuer Astronomie, Bonn
Project Manager

Dr. Tommaso Giannantonio
Auf dem Huegel 71
53121 Bonn
Abstract
We study the effects of $f(R)$ theories of gravity on the cosmic microwave background (CMB) anisotropies power spectrum, and in particular on its large scales, where the integrated Sachs--Wolfe (ISW) effect is important. For this class of theories, the evolution of the metric potentials are altered, and therefore the contribution to the ISW effect can differ significantly from that in the standard model of cosmology. We proceed to compare these predictions with the observative data for the CMB and the ISW, performing a full Monte Carlo Markov chain (MCMC) analysis. The result is a significantly small upper limit on the length scale associated to the extra scalar degree of freedom characterizing $f(R)$ theories.
Impressum, Conny Wendler