73 research outputs found
Dynamical nucleus-nucleus potential and incompressibility of nuclear matter
The dynamical nucleus-nucleus potentials for some fusion reactions are
investigated by using the improved quantum molecular dynamics (ImQMD) model
with different sets of parameters in which the corresponding incompressibility
coefficient of nuclear matter is different. Two new sets of parameters SKP* and
IQ3 for the ImQMD model are proposed with the incompressibility coefficient of
195 and 225 MeV, respectively. The measured fusion excitation function for
16O+208Pb and the charge distribution of fragments for Ca+Ca and Au+Au in
multi-fragmentation process can be reasonably well reproduced. Simultaneously,
the influence of the nuclear matter incompressibility and the range of
nucleon-nucleon interaction on the nucleus-nucleus dynamic potential is
investigated.Comment: 7 figures, 3 tables, to appear in Phys. Rev.
Phase transition in multi-scalar-singlet extensions of the Standard Model
We propose a generalization of the Standard Model (SM) by adding two real
gaugesinglets S1, S2. The field S1 will improve the strength of the electroweak
phase transition (EWPT). Imposing a Z2 symmetry on the field S2 makes this
field a possible candidate for dark matter. Both singlets interact with other
observable fields through Higgs boson. They are allowed to interact with each
other as well. We find that by introducing two different scalar fields, the
model is less vulnerable to experimental constraints. In this paper, we
consider the effects of a heavy scalar(M1 > MH) on the electroweak phase
transition. And we present configurations that produce a strong first order
EWPT
Braneworld inflation
We discuss various realizations of the four dimensional braneworld inflation
in warped geometries of string theory. In all models the inflaton field is
represented by a Dp probe brane scalar specifying its position in the warped
throat of the compactification manifold. We study existing inflationary throat
local geometries, and construct a new example. The inflationary brane is either
a D3- or a D5-brane of type IIB string theory. In the latter case the
inflationary brane is wrapping a two-cycle of the compactification manifold. We
discuss some phenomenological aspects of the model where slow-roll conditions
are under computational control.Comment: 31 pages + 6 figures, v2: published PRD versio
Nonanticommutative superspace and N= 1/2 WZ model
In these proceedings we review the main results concerning superspace
geometries with nonanticommutative spinorial variables and field theories
formulated on them. In particular, we report on the quantum properties of the
WZ model formulated in the N=1/2 nonanticommutative superspace.Comment: 9 pages, plain Latex, contribution to the proceedings of the
Copenhagen RTN workshop, 15-20 September 200
- …