Constraints on the reheating temperature of the universe from WMAP-5 and future perspectives

We report new constraints on the reheating temperature of the Universe by analyzing the Cosmic Microwave Background data from the WMAP five year survey. From WMAP-5 data alone we found an upper limit at 95% c.l. of Tre>2MeV, while including external priors from the SDSS Red Luminous Galaxy survey and age constraints improves the limit to Tre>3.2MeV (again at 95% c.l.). Future analysis from combined CMB and weak lensing surveys as Planck and Euclid will improve the the constraints by a factor ∼2. We test the stability of the current upper limits on neutrino masses from cosmology under the hypothesis of non-standard thermal neutrino background.