8 research outputs found
Quark-Gluon Plasma - New Frontiers
As implied by organizers, this talk is not a conference summary but rather an
outline of progress/challenges/``frontiers'' of the theory. Some fundamental
questions addressed are:
Why is sQGP such a good liquid? Do we understand (de)confinement and what do
we know about ``magnetic'' objects creating it? Can we understand the AdS/CFT
predictions, from the gauge theory side? Can they be tested experimentally? Can
AdS/CFT duality help us understand rapid equilibration/entropy production? Can
we work out a complete dynamical ``gravity dual'' to heavy ion collisions?Comment: final talk at Quark Matter 2008, Jaipur, India, Feb.200
Mach Cones in Quark Gluon Plasma
The experimental azimuthal dihadron distributions at RHIC show a double peak
structure in the away side ( rad.) for intermediate
particles. A variety of models have appeared trying to describe this
modification. We will review most of them, with special emphasis in the Conical
Flow scenario in which the observed shape is a consequence of the emission of
sound by a supersonic high momentum particle propagating in the Quark Gluon
Plasma.Comment: 8 pages, 3 figures, Invited plenary talk given at the 19th
International Conference on Ultrarelativistic Nucleus-Nucleus Collisions:
Quark Matter 2006 (QM 2006), Shanghai, China, 14-20 Nov 200
Mimicking Lambda with a spin-two ghost condensate
We propose a simple higher-derivative braneworld gravity model which contains
a stable accelerating branch, in the absence of cosmological constant or
potential, that can be used to describe the late time cosmic acceleration. This
model has similar qualitative features to that of Dvali-Gabadadze-Porrati, such
as the recovery of four-dimensional gravity at subhorizon scales, but unlike
that case, the graviton zero mode is massless and there are no linearized
instabilities. The acceleration rather is driven by bulk gravity in the form of
a spin-two ghost condensate. We show that this model can be consistent with
cosmological bounds and tests of gravity.Comment: references adde