Publications (234)688.53 Total impact
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ABSTRACT: The collective behaviour of hadronic particles has been observed in high multiplicity protonlead collisions at the Large Hadron Collider (LHC), as well as in deuterongold collisions at the Relativistic HeavyIon Collider (RHIC). In this work we present the first calculation, in the hydrodynamic framework, of thermal photon radiation from such small collision systems. Owing to their compact size, these systems can reach temperatures comparable to those in central nucleusnucleus collisions. The thermal photons can thus shine over the prompt background, and increase the low $p_T$ direct photon spectrum by a factor of 23 in 01% p+Pb collisions at 5.02 TeV. This thermal photon enhancement can therefore serve as a clean signature of the existence of a hot quarkgluon plasma during the evolution of these small collision systems, as well as validate hydrodynamic behavior in small systems.  [Show abstract] [Hide abstract]
ABSTRACT: If the bulk viscosity of QCD matter is large, the effective pressure of the hot and dense matter created in ultrarelativistic heavy ion collisions can become negative, leading to instabilities in the evolution of the plasma. In the context of heavy ion collisions, this effect is sometimes referred to as cavitation. In this contribution we discuss the onset of cavitation in eventbyevent hydrodynamic simulations of ultrarelativistic heavy ion collisions at LHC energies. We estimate how large the bulk viscosity of the QGP has to be in the QCD (pseudo) phase transition region in order for the effective pressure of the system to actually become negative. 
Article: Production and Elliptic Flow of Dileptons and Photons in a Matrix Model of the QuarkGluon Plasma.
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ABSTRACT: We consider a nonperturbative approach to the thermal production of dileptons and photons at temperatures near the critical temperature in QCD. The suppression of colored excitations at low temperature is modeled by including a small value of the Polyakov loop, in a "semi"quarkgluon plasma (QGP). Comparing the semiQGP to the perturbative QGP, we find a mild enhancement of thermal dileptons. In contrast, to leading logarithmic order in weak coupling there are far fewer hard photons from the semiQGP than the usual QGP. To illustrate the possible effects on photon and dilepton production in heavyion collisions, we integrate the rate with a simulation using ideal hydrodynamics. Dileptons uniformly exhibit a small flow, but the strong suppression of photons in the semiQGP tends to weight the elliptical flow of photons to that generated in the hadronic phase.Physical Review Letters 02/2015; 114(7):072301. · 7.51 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We investigate the consequences of a nonzero bulk viscosity coefficient on the transverse momentum spectra, azimuthal momentum anisotropy, and multiplicity of charged hadrons produced in heavy ion collisions at LHC energies. The agreement between a realistic 3D hybrid simulation and the experimentally measured data considerably improves with the addition of a bulk viscosity coefficient for strongly interacting matter. This paves the way for an eventual quantitative determination of several QCD transport coefficients from the experimental heavy ion and hadronnucleus collision programs.  [Show abstract] [Hide abstract]
ABSTRACT: We perform 3+1D viscous hydrodynamics calculations of protonnucleus (pA) and nucleusnucleus (AA) collisions. Our goal is to understand the apparent collective behavior recently observed in pA collisions and to verify whether the highest multiplicity collision systems can be accurately described as a relativistic fluid. We compare our calculations of flow variables to existing measurements, and demonstrate that hydrodynamics correctly captures the measured trends. We show that our predictions for the pair correlation observable rnrn are validated by recent experimental pA measurements, and that our results are sensitive to the granularity of the initial state. We also compare our results with measurements done for nucleusnucleus collisions.Nuclear Physics A 12/2014; 931. DOI:10.1016/j.nuclphysa.2014.09.054 · 2.50 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Photons are a penetrating probe of the hot and dense medium created in heavyion collisions. We present stateoftheart calculations of viscous photon emission from nuclear collisions at RHIC and LHC. Thermal photons' anisotropic flow coefficients are computed, both with and without accounting for viscous corrections to the standard thermal emission rates. These corrections are found to have a larger effect on the coefficients than the viscous suppression of hydrodynamic flow anisotropies. For thermal photons, the ratio shows stronger sensitivity to the quark–gluon plasma (QGP) shear viscosity than for hadrons, and it can thus serve as a sensitive QGP viscometer.Nuclear Physics A 12/2014; 932:184188. DOI:10.1016/j.nuclphysa.2014.07.042 · 2.50 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We compute the photon emission rate from a quarkgluon plasma with an anisotropic particle momentum distribution induced by a nonvanishing local shear pressure tensor. Our calculation includes photon production through Compton scattering and quarkantiquark annihilation at leading order in $\alpha_s$, with all offequilibrium corrections to leading order in the momentum anisotropy. For fermions we prove that the KuboMartinSchwinger (KMS) relation holds in the hard loop regime for any particle momentum distribution function that is reflectionsymmetric. This supports the equivalence, for 2 to 2 scattering processes, of the diagrammatic and kinetic approaches to calculating the photon emission rate. We compare the viscous rates from these two approaches at weak and realistic coupling strengths and provide parameterizations of the equilibrium and viscous photon emission rates for phenomenological studies in relativistic heavyion collisions.Physical Review C 10/2014; 91(1). DOI:10.1103/PhysRevC.91.014908 · 3.88 Impact Factor 
Article: Production and Elliptic Flow of Dileptons and Photons in a Matrix Model of the QuarkGluon Plasma
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ABSTRACT: We consider the thermal production of dileptons and photons at temperatures above the critical temperature in QCD. We use a model where color excitations are suppressed by a small value of the Polyakov loop, the semi QuarkGluon Plasma (QGP). Comparing the semiQGP to the perturbative QGP, we find a mild enhancement of thermal dileptons. In contrast, to leading logarithmic order in weak coupling there are far fewer hard photons from the semiQGP than the usual QGP. To illustrate the possible effects on photon and dileptons production in heavy ion collisions, we integrate the rate with a realistic hydrodynamic simulation. Dileptons uniformly exhibit a small flow, but the strong suppression of photons in the semiQGP tends to bias the elliptical flow of photons to that generated in the hadronic phase.Physical Review Letters 09/2014; 114(7). DOI:10.1103/PhysRevLett.114.072301 · 7.51 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We discuss various features of multiparticle production in highenergy nuclear collisions within the IPGlasma model. We demonstrate that for some observables in heavy ion collisions the effects of final state interactions governed by fluiddynamics are essential. In smaller systems, like protonlead collisions, the same model fails to describe the azimuthal anisotropy of produced particles. This failure can be due to neglected initial state correlations or the lack of a detailed description of the fluctuating spatial structure of the proton at high energies, or both.Journal of Physics Conference Series 09/2014; 535(1):012026. DOI:10.1088/17426596/535/1/012026  [Show abstract] [Hide abstract]
ABSTRACT: Thermal noise is present in any viscous fluid, making the simulation of relativistic noise in heavy ion collisions a necessity. It is likely possible to use it to make an independent measurement of viscosity in heavy ion collisions. The size, energy densities, and time scales of the collisions determine the relative importance of thermal noise. This causes a nontrivial contribution to twoparticle correlations as well as eventbyevent fluctuations in observables.Journal of Physics Conference Series 09/2014; 535(1):012034. DOI:10.1088/17426596/535/1/012034  [Show abstract] [Hide abstract]
ABSTRACT: A consistency check for any UV complete model for large N QCD should be, among other things, the existence of a welldefined vector and scalar mesonic spectra. In this paper, we use our UV complete model in type IIB string theory to study the IR dynamics and use this to predict the mesonic spectra in the dual type IIA side. The advantage of this approach is twofold: not only will this justify the consistency of the supergravity approach, but it will also give us a way to compare the IR spectra and the model with the ones proposed earlier by Sakai and Sugimoto. Interestingly, the spectra coming from the massless stringy sector are independent of the UV physics, although the massive string sector may pose certain subtleties regarding the UV contributions as well as the mappings to actual QCD. Additionally, we find that a component of the string landscape enters the picture: there are points in the landscape where the spectra can be considerably improved over the existing results in the literature. These points in the landscape inturn also determine certain background supergravity components and fix various pathologies that eventually lead to a consistent low energy description of the theory.  [Show abstract] [Hide abstract]
ABSTRACT: We elaborate on the brane configuration that gives rise to a QCDlike gauge theory that confines at low energies and becomes scale invariant at the highest energies. In the limit where the rank of the gauge group is large, a gravitational description emerges. For the confined phase, we obtain a vector meson spectrum and demonstrate how certain choice of parameters can lead to quantitative agreement with empirical data.  [Show abstract] [Hide abstract]
ABSTRACT: It is argued that, in heavy ion collisions, thermal dileptons are good probes of the transport properties of the medium created in such events, and also of its earlytime dynamics, usually inaccessible to hadronic observables. In this work we show that electromagnetic azimuthal momentum anisotropy do not only display a sensitivity to the shear relaxation time and to the initial shearstress tensor profile, but also to the temperature dependence of the shear viscosity coefficient.Nuclear Physics A 08/2014; 931. DOI:10.1016/j.nuclphysa.2014.08.078 · 2.50 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We investigate the implications of a nonzero bulk viscosity coefficient on the azimuthal momentum anisotropy of ultracentral relativistic heavy ion collisions at the Large Hadron Collider. We find that, with IPGlasma initial conditions, a finite bulk viscosity coefficient leads to a better description of the flow harmonics in ultracentral collisions. We then extract optimal values of bulk and shear viscosity coefficients that provide the best agreement with flow harmonic coefficients data in this centrality class.Nuclear Physics A 07/2014; 931. DOI:10.1016/j.nuclphysa.2014.09.044 · 2.50 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We consider directly emitted and hadronic decay photons from eventbyevent hydrodynamic simulations. We compute the direct photon anisotropic flow coefficients and compare with recent experimental measurements. We find that it is crucial to include the photon multiplicity as a weighting factor in the definition of $v^\gamma_n$. We also investigate the sensitivity of the direct photon spectrum and elliptic flow to the theoretical uncertainty of the photon emission rate in the quarkhadron transition region and to the preequilibrium dynamics of relativistic heavyion collisions.Nuclear Physics A 07/2014; 931. DOI:10.1016/j.nuclphysa.2014.08.030 · 2.50 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The fluctuationdissipation theorem requires the presence of thermal noise in viscous fluids. The time and length scales of heavy ion collisions are small enough so that the thermal noise can have a measurable effect on observables. Thermal noise is included in numerical simulations of high energy leadlead collisions, increasing average values of the momentum eccentricity and contributing to its event by event fluctuations.Physical Review C 07/2014; 91(4). DOI:10.1103/PhysRevC.91.044901 · 3.88 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We investigate the effect of nucleonnucleon correlations on the initial condition of ultracentral heavy ion collisions at LHC energies. We calculate the eccentricities of the MCGlauber and IPGlasma models in the 01% centrality class and show that they are considerably affected by the inclusion of such type of correlations. For an IPGlasma initial condition, we further demonstrate that this effect survives the fluiddynamical evolution of the system and can be observed in its final state azimuthal momentum anisotropy.  [Show abstract] [Hide abstract]
ABSTRACT: We perform 3+1D viscous hydrodynamic calculations of protonlead and leadlead collisions at top LHC energy. We show that existing data from highmultiplicity pPb events can be well described in hydrodynamics, suggesting that collective flow is plausible as a correct description of these collisions. However, a more stringent test of the presence of hydrodynamic behavior can be made by studying the detailed momentum dependence of twoparticle correlations. We define a relevant observable, $r_n$, and make predictions for its value and centrality dependence if hydrodynamics is a valid description. This will provide a nontrivial confirmation of the nature of the correlations seen in small collision systems, and potentially to determine where the hydrodynamic description, if valid anywhere, stops being valid. Lastly, we probe what can be learned from this observable, finding that it is insensitive to viscosity, but sensitive to aspects of the initial state of the system that other observables are insensitive to, such as the transverse length scale of the fluctuations in the initial stages of the collision. 
Article: Probing the earlytime dynamics of relativistic heavyion collisions with electromagnetic radiation
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ABSTRACT: Using 3+1D viscous relativistic fluid dynamics, we show that electromagnetic probes are sensitive to the initial conditions and to the outofequilibrium features of relativistic heavyion collisions. Within the same approach, we find that hadronic observables show a much lesser sensitivity to these aspects. We conclude that electromagnetic observables allow access to dynamical regions that are beyond the reach of soft hadronic probes.Nuclear Physics A 04/2014; DOI:10.1016/j.nuclphysa.2014.08.053 · 2.50 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We compute the transport coefficients that appear in the fluiddynamical equations for the bulk viscous pressure and shearstress tensor using the 14moment approximation in the limit of small, but finite, masses. In this limit, we are able to express all these coefficients in terms of known thermodynamic quantities, such as the thermodynamic pressure, energy density, and the velocity of sound. We explicitly demonstrate that the ratio of bulk viscosity to bulk relaxation time behaves very differently, as a function of temperature, than the ratio of shear viscosity to shear relaxation time. We further explicitly compute, for the first time, the transport coefficients that couple the bulk viscous pressure to the shearstress tensor and vice versa. The coefficient that couples bulk viscous pressure to shearstress tensor is found to be orders of magnitude larger than the bulk viscosity itself, suggesting that bulk viscous pressure production owes more to this coupling than to the expansion rate of the system.Physical Review C 03/2014; 90(2). DOI:10.1103/PhysRevC.90.024912 · 3.88 Impact Factor
Publication Stats
5k  Citations  
688.53  Total Impact Points  
Top Journals
Institutions

1986–2015

McGill University
 Department of Physics
Montréal, Quebec, Canada


2013

Texas A&M University
 Department of Physics and Astronomy
College Station, Texas, United States


1990–1998

Michigan State University
ИстЛансинг, Michigan, United States


1992–1994

Kent State University
 Department of Physics
Kent, Ohio, United States


1988–1989

Atomic Energy of Canada Limited
Deep River, Ontario, Canada


1987

University of Minnesota Duluth
 Department of Physics
Duluth, Minnesota, United States
