Mrs
Nuria Rius
(IFIC, Valencia University-CSIC)
05/12/2014, 16:30
Neutrinos in cosmology and astroparticle physics
We propose a mechanism for baryogenesis from particle decays or annihilations that can work at the TeV scale. Some heavy particles annihilate or decay into a heavy sterile neutrino $N$ (with $M \gtrsim 0.5$~TeV) and a ``light'' one $\nu$ (with $m \ll 100$~GeV), generating an asymmetry among the two helicity degrees of freedom of $\nu$. This asymmetry is partially transferred to Standard Model...
Daniele Teresi
(University of Manchester)
05/12/2014, 17:00
Flavour effects play an important role in the statistical evolution of particle number densities in several particle physics phenomena. We present a fully flavour-covariant formalism for transport phenomena, in order to consistently capure all flavour effects in the system. We explicitly study a Resonant Leptogenesis (RL) scenario, and show that flavour covariance requires one to consider...
sarben sarkar
(King's College London)
05/12/2014, 17:25
We consider a model of an expanding Universe in string theory that yields CPT violation for fermions, in the sense of different dispersion relations for fermions and antifermions. These are induced by a cosmological background with constant torsion provided by the Kalb–Ramond antisymmetric tensor field (axion) of the string gravitational multiplet. This effect induces different densities of...