G. Mangano

Relic neutrino decoupling including flavour oscillations

Abstract In the early universe, neutrinos are slightly coupled when electron–positron pairs annihilate transferring their entropy to photons. This process originates non-thermal distortions on the neutrino spectra which depend on neutrino flavour, larger for ν e than for ν μ or ν τ . We study the effect of three-neutrino flavour oscillations on the process of neutrino decoupling by solving the momentum-dependent kinetic equations for the neutrino spectra. We find that oscillations do not essentially modify the total change in the neutrino energy density, giving N eff = 3.046 in terms of the effective number of neutrinos, while the small effect over the production of primordial 4 He is increased by O ( 20 % ) , up to 2.1 × 10 −4 . These results are stable within the presently favoured region of neutrino mixing parameters.

Nuclear reaction network for primordial nucleosynthesis: a detailed analysis of rates, uncertainties and light nuclei yields

We analyse in detail the standard primordial nucleosynthesis scenario. In particular, we discuss the key theoretical issues which are involved in a detailed prediction of light nuclide abundances, such as the weak reaction rates, neutrino decoupling and nuclear rate modelling. We also perform a new analysis of available data on the main nuclear processes entering the nucleosynthesis reaction network, with particular stress on their uncertainties as well as on their role in determining the corresponding uncertainties on light nuclide theoretical estimates. The current status of theoretical versus experimental results for 2H, 3He, 4He and 7Li is then discussed using the determination of the baryon density as obtained from cosmic microwave background anisotropies.

Constraining neutrino physics with big bang nucleosynthesis and cosmic microwave background radiation

We perform a likelihood analysis of the recent results on the anisotropy of Cosmic Microwave Background Radiation from the BOOMERanG and DASI experiments to show that they single out an effective number of neutrinos in good agreement with standard Big Bang Nucleosynthesis. We also consider degenerate Big Bang Nucleosynthesis to provide new bounds on effective relativistic degrees of freedom

COUPLED QUINTESSENCE AND THE COINCIDENCE PROBLEM

N_\nu

Testing standard and degenerate big bang nucleosynthesis with BOOMERANG and MAXIMA-1

and, in particular, on neutrino chemical potential

Big bang nucleosynthesis: an accurate determination of light element yields

\xi_\alpha

The path to metallicity: Synthesis of CNO elements in standard BBN

. When including Supernova Ia data we find, at

Do observations prove that cosmological neutrinos are thermally distributed

2\sigma

Ultrahigh Energy Neutrinos in the Mediterranean: Detecting v(tau) and v(mu with a km**3 Telescope

,

Disentangling neutrino-nucleon cross section and high energy neutrino flux with a km^3 neutrino telescope

N_\nu \leq 7