Viable dark matter via radiative symmetry breaking in a Higgs portal extension of the standard model

Speaker: Zhi-Wei Wang
Location: Physics 175
Time: 3:30,  June 19 2014

Abstract: We consider generation of dark matter mass via radiative
electroweak symmetry breaking in an extension of the conformal Standard Model
containing a singlet scalar field with a Higgs portal interaction. Generating the mass
from a sequential process of radiative electroweak symmetry breaking followed by
a conventional Higgs mechanism can account for less than 30% of the cosmological
dark matter abundance. However in a dynamical approach where both Higgs and
scalar singlet masses are generated via radiative electroweak symmetry breaking we
obtain much higher levels of dark matter abundance: 10%-80% for a dark matter
mass of 80 GeV < Ms < 96 GeV when higher-order contributions are estimated.
The dynamical approach also predicts a small scalar-singlet self-coupling, providing
a natural explanation for the astrophysical observations that place upper bounds
on dark matter self-interaction. The predictions in both methods are within the
detection region of the next generation XENON experiment.

Black holes: some physical aspects and symmetries

Who (supervisor): Haryanto Siahaan (Masoud Ghezelbash)
Venue: PEGASUS Student Summer Seminar, Aug 2, 2012.
Abstract: Some physical aspects and symmetries of black holes together are interesting to be studied. In this talk, the black hole solutions in vacuum Einstein equation will be presented. Also the symmetries of black holes and particles outside of the horizon will be discussed.