DISCRETE 2014: Fourth Symposium on Prospects in the Physics of Discrete Symmetries

Session

Parallel 8: Early universe Physics (Inflation, Lepto(Baryo)genesis)

5 Dec 2014, 16:30

Great Hall and several lecture theatres (King's College London, Strand Campus)

157. WIMPy baryogenesis with sterile neutrinos

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...

24. Flavour Effects in Resonant Leptogenesis from Semi-classical and Kadanoff-Baym Approaches

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...

57. Tree level Baryogenesis through Leptogenesis from Kalb-Ramond Torsion Background

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...

28. Inflation in supergravity from massive vector multiplets

Fotis Farakos

05/12/2014, 18:00

In a supergravity framework we present single field inflationary models built from massive vector multiplets. This property is due to an underlying stueckelberg mechanism where the second scalar partner of the inflaton is eaten by the massive vector. This mechanism can be used to built Starobinsky as well as chaotic models of inflation.

56. Gravitino condensation, supersymmetry breaking and inflation

Nick Houston (KCL)

05/12/2014, 18:30

Supersymmetry is a well motivated theoretical paradigm, which, if it exists, must be broken at low energies. As such, understanding the origin of this breaking is key in order to make contact with known phenomenology. To this end we detail a non-pertubative breaking mechanism for local supersymmetry in gravitino condensation, an approach which we demonstrate also provides a UV motivated,...