15 research outputs found
Heavy ion collisions and AdS/CFT
We review some recent applications of the AdS/CFT correspondence to heavy ion
collisions including a calculation of the jet quenching parameter in N=4
super-Yang-Mills theory and quarkonium suppression from velocity scaling of the
screening length for a heavy quark-antiquark pair. We also briefly discuss
differences and similarities between QCD and N=4 Super-Yang-Mills theory.Comment: Plenary talk given at Quark Matter 2006, Shanghai, China, 14-20 Nov
2006; to appear in the conference proceedin
Theoretical issues in J/psi suppression
Two decades ago Matsui and Satz suggested that Debye screening in the
quark-gluon plasma would result in J/psi suppression in heavy ion collisions.
Much has happened in the subsequent years, and the picture of quark-gluon
plasma at present is rapidly evolving - what does it imply for the J/psi
suppression? What are the recent RHIC and SPS results trying to tell us? What
else has to be done? This talk is an attempt to address these questions.Comment: 8 pages, 6 figures, invited plenary talk at Quark Matter -2006,
Shanghai, China, November 14-20, 200
Toward the AdS/CFT dual of the "Little Bang"
This (rather subjective) review sums up few years of work devoted to explain
various aspects of high energy heavy ion collisions using the AdS/CFT
correspondence. The central issue of is is formation of the trapped surface
(black hole) phenomenon, seen by a distant observer as the entropy production.
We end up discussing an issue of classical gravitational radiation by an
ultrarelativistic falling body and the so called breaking self-force related to
it.Comment: a review to appear in topical volume of reviews collected by editors,
S.Bass and G.Casaladerrey-Solan
Lectures on hydrodynamic fluctuations in relativistic theories
These are pedagogical lecture notes on hydrodynamic fluctuations in normal
relativistic fluids. The lectures discuss correlation functions of conserved
densities in thermal equilibrium, interactions of the hydrodynamic modes, an
effective action for viscous fluids, and the breakdown of the derivative
expansion in hydrodynamics.Comment: 55 pages. Based on lectures given at the Seattle INT Summer School on
Applications of String Theory in July 201
Strongly Correlated Quantum Fluids: Ultracold Quantum Gases, Quantum Chromodynamic Plasmas, and Holographic Duality
Strongly correlated quantum fluids are phases of matter that are
intrinsically quantum mechanical, and that do not have a simple description in
terms of weakly interacting quasi-particles. Two systems that have recently
attracted a great deal of interest are the quark-gluon plasma, a plasma of
strongly interacting quarks and gluons produced in relativistic heavy ion
collisions, and ultracold atomic Fermi gases, very dilute clouds of atomic
gases confined in optical or magnetic traps. These systems differ by more than
20 orders of magnitude in temperature, but they were shown to exhibit very
similar hydrodynamic flow. In particular, both fluids exhibit a robustly low
shear viscosity to entropy density ratio which is characteristic of quantum
fluids described by holographic duality, a mapping from strongly correlated
quantum field theories to weakly curved higher dimensional classical gravity.
This review explores the connection between these fields, and it also serves as
an introduction to the Focus Issue of New Journal of Physics on Strongly
Correlated Quantum Fluids: from Ultracold Quantum Gases to QCD Plasmas. The
presentation is made accessible to the general physics reader and includes
discussions of the latest research developments in all three areas.Comment: 138 pages, 25 figures, review associated with New Journal of Physics
special issue "Focus on Strongly Correlated Quantum Fluids: from Ultracold
Quantum Gases to QCD Plasmas"
(http://iopscience.iop.org/1367-2630/focus/Focus%20on%20Strongly%20Correlated%20Quantum%20Fluids%20-%20from%20Ultracold%20Quantum%20Gases%20to%20QCD%20Plasmas
Thermal Dileptons at LHC
We predict dilepton invariant-mass spectra for central 5.5 ATeV Pb-Pb
collisions at LHC. Hadronic emission in the low-mass region is calculated using
in-medium spectral functions of light vector mesons within hadronic many-body
theory. In the intermediate-mass region thermal radiation from the Quark-Gluon
Plasma, evaluated perturbatively with hard-thermal loop corrections, takes
over. An important source over the entire mass range are decays of correlated
open-charm hadrons, rendering the nuclear modification of charm and bottom
spectra a critical ingredient.Comment: 2 pages, 2 figures, contributed to Workshop on Heavy Ion Collisions
at the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun
2007 v2: acknowledgment include
Holographic Lessons for Quark Dynamics
We give a brief overview of recent results obtained through the gauge/gravity
correspondence, concerning the propagation of a heavy quark in strongly-coupled
conformal field theories (such as N=4 super-Yang-Mills), both at zero and
finite temperature. In the vacuum, we discuss energy loss, radiation damping,
signal propagation and radiation-induced fluctuations. In the presence of a
thermal plasma, our emphasis is on early-time energy loss, screening and
quark-antiquark evolution after pair creation. Throughout, quark dynamics is
seen to be efficiently encapsulated in the usual string worldsheet dynamics.Comment: Invited review for a Journal of Physics G topical volume on
gauge/gravity duality applications to QCD matter and ultrarelativistic
heavy-ion collisions. v2: Reference adde
QCD and strongly coupled gauge theories : challenges and perspectives
We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.Peer reviewe