46 research outputs found
curvature-squared corrections on drag force
The effect of finite-coupling corrections to the drag force on a moving heavy
quark in the Super Yang-Mills plasma is investigated. These corrections are
related to curvature-squared corrections in the corresponding gravity dual. The
results are compared with the dual gauge theory. It is shown that
curvature-squared corrections affect the drag force. It is shown that
corrections to the drag force depend on the velocity of the heavy quark. The
diffusion coefficient of non-relativistic heavy quarks is calculated from the
drag force. In addition, we also calculate the drag force on a moving heavy
quark in the Gauss-Bonnet background.Comment: 12 pages, 1 figure, published version in JHE
Jets in a strongly coupled anisotropic plasma
In this paper, we study the dynamics of the light quark jet moving through
the static, strongly coupled , anisotropic plasma with and
without charge. The light quark is presented by a point-like initial condition
falling string in the context of the AdS/CFT. We calculate the stopping
distance of the light quark in the anisotropic medium and compare it with its
isotropic value. By studying the falling string in the beam direction and
transverse direction, we find that the jet quenching increases in both
directions. Although, the enhancement of quenching is larger in the beam
direction. Also, the suppression of stopping distance is more prominent when
the anisotropic plasma have the same temperature as the isotropic plasma.Comment: Minor misprints corrected, some references added, and some figures
change
Towards a holographic quark-hadron continuity
We study dense nuclear and quark matter within a single microscopic approach,
namely the holographic Sakai-Sugimoto model. Nuclear matter is described via
instantons in the bulk, and we show that instanton interactions are crucial for
a continuous connection of chirally broken and chirally symmetric phases. The
continuous path from nuclear to quark matter includes metastable and unstable
stationary points of the potential, while the actual chiral phase transition
remains of first order, as in earlier approximations. We show that the model
parameters can be chosen to reproduce low-density properties of nuclear matter
and observe a non-monotonic behavior of the speed of sound as a function of the
baryon chemical potential, as suggested by constraints from QCD and
astrophysics.Comment: 28+19 pages, 5 figures; v2: clarifications and references added,
version to appear in JHE