We use the Fisher-matrix formalism to investigate whether the galaxy bispectrum in redshift space contains additional cosmological information with respect to the power spectrum alone. In this talk we present detailed forecasts for a Euclid-like survey and consider cosmological models dominated by dark energy and cold dark matter with Gaussian primordial perturbations. Our study shows that...
The Radial Acceleration Relation (RAR) has recently emerged as a challenge to the LambdaCDM cosmological model and possibly as an evidence of new physics, most notably of Modified Newtonian Dynamics (MOND). Satellite galaxies represent an intriguing laboratory for testing these theories, since in MOND they are affected by the external field effect, that has no analogous in LambdaCDM. I will...
This talk describes a novel way to test the hypothesis that gravity does not follow the standard Newton/Einstein model at low accelerations. This MOND hypothesis (Milgrom 1983) correctly predicted that astronomers would find a very tight correlation between the internal acceleration within galaxies calculated according to standard physics (visible mass + Newtonian gravity) and that inferred...
