Dr
Oscar Vives
(U. de Valencia and IFIC)
26/08/2010, 14:00
Astro
In this work, we explore the "degenerate gravitino" scenario where the mass difference between the gravitino and the lightest MSSM particle is much smaller than the gravitino mass itself. In this case, the energy released in the decay of the next to lightest sypersymmetric particle (NLSP) is reduced. Consequently the cosmological and astrophysical constraints on the gravitino abundance, and...
Dr
Krzysztof Turzynski
(University of Warsaw)
26/08/2010, 14:17
Astro
Supersymmetry breaking mediated by gauge interactions is regarded an attractive option due to the lack of new sources of flavor changing neutral currents other than those already present in the Standard Model. In models with gauge mediated supersymmetry breaking (GMSB), the dark matter particle is the gravitino. It is produced both thermally in scatterings in the hot plasma and non-thermally...
Dr
Grigoris Panotopoulos
(University of Valencia)
26/08/2010, 14:34
Astro
The viability of a possible cosmological scenario is investigated.
The theoretical framework is the constrained next-to-minimal
supersymmetric standard model (cNMSSM), with a gravitino playing the
role of the lightest
supersymmetric particle (LSP) and a neutralino acting as the
next-to-lightest
supersymmetric particle (NLSP). All the necessary constraints from
colliders and cosmology...
Mr
Jasper Hasenkamp
(Hamburg University)
26/08/2010, 14:51
Astro
Many extensions of the Standard Model predict super-weakly interacting particles, which typically have to decay before Big Bang Nucleosynthesis (BBN). The entropy produced in the decays may help to reconcile thermal leptogenesis and BBN in scenarios with gravitino dark matter, which is usually difficult due to late decays of the next-to-lightest supersymmetric particle (NLSP) spoiling the...
Dr
Gilles Vertongen
(DESY Hamburg)
26/08/2010, 15:08
Astro
We study tachyonic preheating associated with the spontaneous breaking of B-L, the difference of baryon and lepton number. Reheating occurs through the decays of heavy Majorana neutrinos which are produced during preheating and in decays of the Higgs particles of B-L breaking. Baryogenesis is an interplay of nonthermal and thermal leptogenesis, accompanied by thermally produced gravitino dark...
Ms
Valerie Domcke
(Max Planck Institut für Physik)
26/08/2010, 15:25
Astro
In sneutrino hybrid inflation the superpartner of one of the right-handed neutrinos involved in the seesaw mechanism plays the role of the inflaton field. It obtains its large mass after the 'waterfall' phase transition which ends hybrid inflation. After this phase transition the oscillations of the sneutrino inflaton field may dominate the universe and efficiently produce the baryon asymmetry...
