Dr
John McDonald
(Lancaster University)
28/07/2007, 16:30
Cosmology and Astrophysics
Parallel Talk
The similarity of the observed densities of baryons and CDM suggest that they
have a common or related origin. This can be understood in the context of the
MSSM with RH sneutrinos if CDM is due to a d=4 flat direction condensate of
very weakly coupled RH sneutrino LSPs and the baryon asymmetry is
generated by d = 4 (H_{u}L)^2 Affleck-Dine leptogenesis. An observable CDM
isocurvature...
Ms
Mariangela Lisanti
(SLAC, Stanford University)
28/07/2007, 16:50
Cosmology and Astrophysics
Parallel Talk
The six Higgs doublet model is a minimal extension of the Standard Model (SM) that addresses dark matter and
gauge coupling unification. Another Higgs doublet in the 5 representation of a discrete symmetry group, such as
S_6, is added to the SM. The lightest components of the 5-Higgs are neutral, stable and serve as dark matter so
long as the discrete symmetry is not broken. ...
Mr
Tomas Hällgren
(Royal Institute of Technology (KTH), Department of theoretical physics)
28/07/2007, 17:10
Cosmology and Astrophysics
Parallel Talk
It has previously been shown that in left-right symmetric type I+II
seesaw mechanism, an eight-fold degeneracy among the mass matrices of
the heavy right handedneutrinos M_R exist. We discriminate among the
degenerate solutions, using stability properties of the solutions and
their ability to lead to successful baryogenesis via leptogenesis as
criteria. Thus, we can partially lift the...
Prof.
Tonnis ter Veldhuis
(Macalester College)
28/07/2007, 17:30
Cosmology and Astrophysics
Parallel Talk
If the Standard Model is confined to a brane that spontaneously breaks some of the space-time symmetries of the
embedding space, then additional massive vector fields must be included. According to the low energy, four
dimensional effective theory describing this scenario, these vector fields couple to the energy momentum tensor of
the Standard Model. As the additional vector fields can...
