Description
Chair: Rennan Barkana (Tel Aviv University)
Prof.
Urjit Yajnik
(IIT Bombay)
11/14/13, 8:30 AM
Cosmology
oral
We study cosmology in a model with spontaneous parity breaking in the context
of metastable supersymmetry breaking vacuum. We point out that such a mechanism leads to parity violation only locally, leading to the formation of a network of domain walls. We show that conflict with observed cosmology can be avoided through Planck scale suppressed terms,
provided the parity breaking scale is...
Prof.
Masahiro Kawasaki
(Institute for Cosmic Ray Research, University of Tokyo)
11/14/13, 8:55 AM
Cosmology
oral
Axion models have two serious cosmological problems, domain wall and isocurvature perturbation problems.These problems may be solved if the field value of the Peccei-Quinn (PQ) scalar is large during inflation. However, the fluctuations of the PQ field grow after inflation through the parametric resonance and stable axionic strings may be produced, which results in the domain wall problem. We...
Mr
Tomohiro Takesako
(ICRR, University of Tokyo)
11/14/13, 9:20 AM
Cosmology
oral
We evaluate the effective mass of a scalar field $¥phi$ coupled to thermal plasma through Planck-suppressed interactions.
We find it useful to rescale the coupled fields so that all the $¥phi$-dependences are absorbed into the yukawa and gauge couplings,
which allows us to read off the leading order contributions to the effective mass $¥tilde m_{¥phi}$ from the 2-loop free energy...
Mr
Tomohiro Nakama
(Research Center for the Early Universe, the University of Tokyo)
11/14/13, 9:45 AM
Cosmology
oral
If the amplitude of the density perturbation is sufficiently large in some region in the early
universe dominated by radiation, this region starts to contract against pressure gradients after
the horizon reently and collapses to form a black hole (Primordial Black Hole, PBH). In order
to analyze formation process of these PBHs, in our previous paper we developed an asymptotic
expansion...
