5,846 research outputs found
Azimuthal correlations of D-mesons in + and +Pb collisions at LHC energies
We study the correlations of D mesons produced in + and +Pb
collisions. These are found to be sensitive to the effects of the cold nuclear
medium and the transverse momentum () regions we are looking into. In
order to put this on a quantitative footing, as a first step we analyse the
azimuthal correlations of D meson-charged hadron(Dh), and then predict the same
for D meson -anti D meson () pairs in + and +Pb
collisions with strong coupling at leading order ()
and next to leading order () which includes space-time
evolution (in both systems), as well cold nuclear matter effects (in +Pb).
This also sets the stage and baseline for the identification and study of
medium modification of azimuthal correlations in relativistic collision of
heavy nuclei at the Large Hadron Collider.Comment: 12 pages, 4 figure
Micromechanical Modeling and Design Optimization of 2-D Triaxial Braided Composites
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/97106/1/AIAA2012-1257.pd
Unified Dark Fluid and Cosmic Transit Models in Brans-Dicke Theory
Some dark energy cosmological models are constructed in the framework of a
generalised Brans-Dicke theory which contains a self interacting potential and
a dynamical coupling parameter. The dark sector of the universe is considered
through a unified linear equation of state. The parameters of the unified dark
fluid have been constrained from some physical basis. Since the universe is
believed to have undergone a transition from an early deceleration to a late
time acceleration, the deceleration parameter should have a signature flipping
behaviour at the transition redshift. We have used a hybrid scale factor to
simulate the dynamical behaviour of the deceleration parameter. Basing upon the
observational constraints on the transition redshift, we have constructed four
different transitioning dark energy models. The constructed models are
confronted with observational data. For all the models, the behaviour of the
dynamical scalar field, Brans-Dicke parameter, Self interacting potential are
investigated. Also, on the basis of the generalised Brans-Dicke theory, we have
estimated the time variation of the Newtonian gravitational constant.Comment: 17pages, 12 figure
Evolution of Generalized Brans-Dicke parameter within a Superbounce scenario
We have studied a superbounce scenario in a set up of Brans-Dicke (BD)
theory. The BD parameter is considered to be time dependent and is assumed to
evolve with the Brans-Dicke scalar field. In the superbounce scenario, the
model bounces at an epoch corresponding to a Big Crunch provided the ekpyrotic
phase continues until that time. Within the given superbounce scenario, we
investigate the evolution of the BD parameter for different equations of state.
We chose an axially symmetric metric that has an axial symmetry along the
x-axis. The metric is assumed to incorporate an anisotropic expansion effect.
The effect of asymmetric expansion and the anisotropic parameter on the
evolving and the non-evolving part of the BD parameter is investigated.Comment: 10 pages, 5 figures, accepted version of the journal Symmetr
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