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Search Results: 1 - 10 of 241 matches for " Strickland "
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The chromo-weibel instability
Strickland, Michael;
Brazilian Journal of Physics , 2007, DOI: 10.1590/S0103-97332007000500021
Abstract: i discuss the physics of non-abelian plasmas which are locally anisotropic in momentum space. such momentum-space anisotropies are generated by the rapid longitudinal expansion of the matter created in the first 1 fm/c of an ultrarelativistic heavy ion collision. in contrast to locally isotropic plasmas anisotropic plasmas have a spectrum of soft unstable modes which are characterized by exponential growth of transverse chromo-magnetic/-electric fields at short times. this instability is the qcd analogue of the weibel instability of qed. parametrically the chromo-weibel instability provides the fastest method for generation of soft background fields and dominates the short-time dynamics of the system. the existence of the chromo-weibel instability has been proven using diagrammatic methods, transport theory, and numerical solution of classical yang-mills fields. i review the results obtained from each of these methods and discuss the numerical techniques which are being used to determine the late-time behavior of plasmas subject to a chromo-weibel instability.
Thermalization and the chromo-Weibel instability
Strickland, Michael
High Energy Physics - Phenomenology , 2007, DOI: 10.1088/0954-3899/34/8/S31
Abstract: Despite the apparent success of ideal hydrodynamics in describing the elliptic flow data which have been produced at Brookhaven National Lab's Relativistic Heavy Ion Collider, one lingering question remains: is the use of ideal hydrodynamics at times t < 1 fm/c justified? In order to justify its use a method for rapidly producing isotropic thermal matter at RHIC energies is required. One of the chief obstacles to early isotropization/thermalization is the rapid longitudinal expansion of the matter during the earliest times after the initial nuclear impact. As a result of this expansion the parton distribution functions become locally anisotropic in momentum space. In contrast to locally isotropic plasmas anisotropic plasmas have a spectrum of soft unstable modes which are characterized by exponential growth of transverse chromo-magnetic/-electric fields at short times. This instability is the QCD analogue of the Weibel instability of QED. Parametrically the chromo-Weibel instability provides the fastest method for generation of soft background fields and dominates the short-time dynamics of the system.
On The Necessity Of The Best (Possible) World
Strickland, Lloyd
Ars Disputandi : the Online Journal for Philosophy of Religion , 2005,
Abstract: Many have argued that if God exists then he must necessarily create the best possible world (hereafter: bpw), which entails that the bpw necessarily exists, and is therefore the only possible world. But without any scope for comparison, the superlative term ¢ € best ¢ € is clearly inappropriate and so the bpw cannot be the bpw at all! As such, it must be impossible for God to create it. Hence if God exists then he must of necessity make something that is impossible to create! Because of its conclusion, I call this the repugnant argument. I consider a number of possible responses to this argument.
Thermal Upsilon(1s) and chi_b1 suppression in sqrt(s_NN)=2.76 TeV Pb-Pb collisions at the LHC
Michael Strickland
Physics , 2011, DOI: 10.1103/PhysRevLett.107.132301
Abstract: I compute the thermal suppression of the Upsilon(1s) and chi_b1 states in sqrt(s_NN)=2.76 TeV Pb-Pb collisions. Using the suppression of each of these states I estimate the total R_AA for the Upsilon(1s) state as a function of centrality, rapidity, and transverse momentum. I find less suppression of the chi_b1 state than would be traditionally assumed; however, my final results for the total Upsilon(1s) suppression are in good agreement with recent preliminary CMS data.
Anisotropic Hydrodynamics: Three lectures
Michael Strickland
Physics , 2014, DOI: 10.5506/APhysPolB.45.2355
Abstract: Anisotropic hydrodynamics is a non-perturbative reorganization of relativistic hydrodynamics that takes into account the large momentum-space anisotropies generated in ultrarelativistic heavy-ion collisions. As a result, it allows one to extend the regime of applicability of hydrodynamic treatments to situations that can be quite far from isotropic thermal equilibrium. In this paper, I review the material presented in a series of three introductory lectures. I review the derivation of ideal and second-order viscous hydrodynamics from kinetic theory. I then show how to extend the methods used to a system that can be highly anisotropic in local-rest-frame momenta. I close by discussing recent work on this topic and then present an outlook to the future.
Anisotropic Hydrodynamics: Motivation and Methodology
Michael Strickland
Physics , 2014, DOI: 10.1016/j.nuclphysa.2014.01.013
Abstract: In this proceedings contribution I review recent progress in our understanding of the bulk dynamics of relativistic systems that possess potentially large local rest frame momentum-space anisotropies. In order to deal with these momentum-space anisotropies, a reorganization of relativistic viscous hydrodynamics can been made around an anisotropic background, and the resulting dynamical framework has been dubbed "anisotropic hydrodynamics." I also discuss expectations for the degree of momentum-space anisotropy of the quark gluon plasma generated in relativistic heavy ion collisions at RHIC and LHC from second-order viscous hydrodynamics, strong-coupling approaches, and weak-coupling approaches.
Non-Perturbative QED and QCD at Finite Temperature
Michael Strickland
Physics , 1998,
Abstract: We present results of numerical solutions of Schwinger-Dyson equations for the finite-temperature quark and electron propagators. It is shown that both strongly coupled QED and QCD undergo a chiral symmetry restoring phase transition as the temperature is increased. We go beyond the bare vertex or "rainbow" approximation by applying the finite-temperature Ward-Takahashi identity to constrain the non-perturbative vertex function.
Thermalization and isotropization in heavy-ion collisions
Michael Strickland
Physics , 2013, DOI: 10.1007/s12043-015-0972-1
Abstract: I review our current understanding of the processes driving the thermalization and isotropization of the quark gluon plasma (QGP) created in ultrarelativistic heavy ion collisions (URHICs). I begin by discussing the phenomenological evidence in favor of the creation of a thermal but momentum-space anisotropic QGP in URHICs. I then discuss the degree of isotropization using viscous (dissipative) hydrodynamics, weak-coupling approaches to QGP dynamics, and strong-coupling approaches to QGP dynamics. Finally, I report on recent progress in the area of real-time non-abelian gauge field simulations and non-abelian Boltzmann-Vlasov-based hard-loop simulations.
Highly anisotropic dissipative hydrodynamics
Michael Strickland
Physics , 2012, DOI: 10.1063/1.4826864
Abstract: The quark gluon plasma generated in ultrarelativistic heavy ion collisions may possess sizable momentum-space anisotropies that cause the longitudinal and transverse pressures in the local rest frame to be significantly different. We review recent attempts to derive a dynamical framework that can reliably describe systems that possess a high degree of momentum-space anisotropy. The dynamical framework that has been developed can describe the evolution of the quark gluon plasma ranging from the longitudinal free-streaming limit to the ideal hydrodynamical limit.
Thermal Bottomonium Suppression
Michael Strickland
Physics , 2012, DOI: 10.1063/1.4795953
Abstract: I discuss recent calculations of the thermal suppression of bottomonium states in relativistic heavy ion collisions. I present results for the inclusive Upsilon(1s) and Upsilon(2s) suppression as a function of centrality. I compare with recent preliminary CMS data available at central rapidities and make predictions at forward rapidities which are within the acceptance of the ALICE dimuon spectrometer.
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