Nuclear Theory Seminars at Texas A&M: Spring & Fall 2015
Location: Cyclotron Conference Room (CYCL-300)
G. Lacroix (University of Mons, Mons, Belgium)
January 30, 4:00pm
"Study of the Yang-Mills and Quark-Gluon Plasma Equations of State thanks to Quasiparticle Approaches"
Understanding QCD at finite temperature and baryonic potential is nowadays a fascinating topic.
Indeed, from the experimental side, SPS, RHIC and LHC have pointed out several evidences of the
existence of a deconfined matter: the Quark-Gluon Plasma (QGP).
From a theoretical point of view, studying the QCD phase diagram and all its implications is a
challenging subject in itself and has motivated many approaches and developments. In particular, in
this seminar, we will focus on two quasiparticle approaches and their comparisons with lattice QCD
In the first approach, the thermodynamics of the Yang-Mills matter in the confined phase is
addressed thanks to a hadron resonance gas model. Its particularity is to obtain equations of state
(EoS) for any gauge groups.
In the second approach, the Dashen, Ma and Bernstein formulation of statistical mechanics is used
in order to produce EoS for QCD matter in the deconfined regime. This formulation has the
advantage to formally take into account many-body interactions. In our developments, we limited
ourself to two-body interactions; These latter being computed within a T-matrix formalism. Then,
the thermodynamics of the Yang-Mills matter (for arbitrary gauge groups), the QGP and a
supersymmetric medium with one supersymmetric generator have been studied.
September 11, 4:00pm
Baoyi Chen (Tian-Jing University, China)
"Coupling between open/hidden charm with hot medium"
We will discuss medium effects of quark gluon plasma and hadron gas on charmonium, and show
sensitivities of charmonium properties to the bulk medium. Within a Langevin equation, we discuss
the evolution of charm thermalization and its effect on charmonium production.
Xingbo Zhao (Iowa State University)
October 02, 4:00pm
"An introduction to Basis Light-front Quantization"
Basis Light-front Quantization (BLFQ) has recently been constructed as a non-perturbative approach to quantum field theory based on light-front quantization and Hamiltonian framework. In this method the mass eigenstates of quantum field systems are solved through the eigenvalue problem of the associated light-front Hamiltonian. The obtained eigenvectors, identified as the light-front wavefunctions, encode the full information on the structure of the associated mass eigenstates. In this talk I start with the basics of BLFQ followed by the applications to the single electron and positronium systems in QED and the heavy quarkonium system in QCD. Then I introduce a recent extension of BLFQ to time-dependent regime, namely, the time-dependent BLFQ (tBLFQ) approach, which is designed to solve for time-evolution of quantum field configurations. I will illustrate tBLFQ through the applications to strong field laser physics and to electron-heavy ion scattering. Finally I conclude with a “roadmap” summarizing our future plans.
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Last updated: Sept 10, 2015
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