Seminars and Colloquia

Cosmology without assuming a cosmologyAstrophysics Seminar

by Prof. Luca Amendola (University of Heidelberg)

Asia/Kolkata
Auditorium

Auditorium

Description

Current estimations of cosmological parameters depend often on assumptions about the cosmological model itself. The estimates of H0 or ?m from CMB surveys, for instance, are valid only assuming a particular model, typically the standard ?CDM. Similar model-dependent results are obtained also from analyses of large-scale structure. In some case it is however possible to combine observations in such a way to get estimates of physical quantities that are valid regardless (to some extent) of the underlying model. Here I will discuss how one can determine the cosmological expansion rate H(z), the space curvature Omega_k and the deviation from Einstein gravity ? by combining in a model-independent way several observational probes, from redshift distortions, to lensing, to matter clustering.