Ricerc@Sapienza

There are many hints, coming from cosmological observations, that the so-called Standard Model of physics is incomplete: dark matter, dark energy and baryogenesis, to mention a few. As the Large Hadron Collider (LHC) continues to give no new clues as to new physical effects, it is necessary to turn to other avenues. The primordial universe is a laboratory for matter at high energies and densities, the earliest moments of which cannot easily be probed by accelerator experiments. Details on the early universe are encoded in the anisotropies, or fluctuations, of the cosmic microwave background (CMB) radiation. Systematic analysis can be done to constrain possible models of beyond the standard model physics using current experimental data. Forecasts can be made to determine the power of future experiments. The complexity of the problem requires numerical methods to be developed and employed. The most successful are Markov Chain MonteCarlo techniques. Using these techniques we propose to constrain possible beyond the standard model parameters. In particular we propose to study non standard neutrino-neutrino interactions, axion-photon interaction strength and more complicated models which solve all cosmological problems at once.