5 research outputs found
Electroweak Phase Transition, Gravitational Waves and Dark Matter in Two Scalar Singlet Extension of The Standard Model
In this paper, the electroweak phase transition, the gravitational waves and
the dark matter issues are investigated in two scalar singlet extension of the
standard model. The detectability of the gravitational wave signals are
discussed by comparing the results with the sensitivity curves of
, , and
detectors. It is shown that the results support the recent reports on the dark
matter relic density by collaboration and the
direct detection experiment by
collaboration.Comment: 18 pages, 2 figures (4 subfigures), 4 tables, final version to match
the published versio
Mass of the Stabilized Radion in the Limit of Finite Quartic Coupling
We present an exact treatment of the modulus stabilization condition with the
general boundary conditions of the bulk scalar field in the Randall-Sundrum
model. We find analytical expressions for the value of the modulus and the mass
of the radion.Comment: 11 pages, 3 figures, Accepted for publication in AHE
Dominant Spacetime in Three Dimensional de Sitter Gravity
In three dimensions, Kerr-de Sitter spacetime as a solution of Einstein
gravity with positive cosmological constant has a single cosmological horizon.
The flat-space limit (zero cosmological constant limit) of this spacetime is
well-defined and yields the flat-space cosmological solution which is a
significant spacetime in the context of flat-space holography. In this paper,
we calculate the free energy of this spacetime and compare it with the free
energy of the three-dimensional de Sitter spacetime. We investigate which one
of these two spacetimes will dominate in the semi-classical approximation for
estimating the partition function. It is shown that for the same temperature of
cosmological horizon of two spacetimes this is the de Sitter spacetime which is
always dominant. Hence, contrary to asymptotically flat and asymptotically AdS
spacetimes, there is no phase transition in three dimensional de Sitter
gravity.Comment: 11 pages, V2: clarifications added, published versio