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Degrand, Thomas

Publications and source records attributed to Degrand, Thomas.

Large $N_c$ Thermodynamics with Dynamical Fermions

We present a progress report on our investigation of the thermodynamics of QCD with $N_f=2$ flavors of dynamical Wilson fermions in the limit of a large number of colors $N_c$. To date, studies of the thermodynamics of QCD at large $N_c$ have been limited to the quenched approximation, i.e., to the behavior of pure $\mathrm{SU}(N_c)$ gauge theory at large $N_c$. This is the first study of thermodynamics at large $N_c$ using dynamical fermions, and thus the first study able to test whether the quenched approximation is a valid way to investigate large $N_c$ thermodynamics. After reviewing 't Hooft's large $N_c$ limit, we discuss the automation we use to make this study feasible, and finally compare our preliminary physics results for $\mathrm{SU}(3-5)$ with large $N_c$ expectations.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

Composite phenomenology as a target for lattice QCD

Some recent beyond Standard Model phenomenology is based on new strongly interacting dynamics of SU(N) gauge fields coupled to various numbers of fermions. When N=3 these systems are analogues of QCD, although the fermion masses are typically different from -- and heavier than -- the ones of real world QCD. Many quantities needed for phenomenology from these models have been computed on the lattice. We are writing a guide for these phenomenologists, telling them about lattice results. We'll tell you (some of) what they are interested in knowing.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

Proposal 1114.11.2956B

The Theoretical Advanced Study Institute was held at the University of Colorado, Boulder, during June 1 - 26, 2015. The topic was "New Frontiers in Fields and Strings." Topics included many discussions of entanglement entropy, the conformal bootstrap, AdS/CFT techniques and applications, cosmology, and the black hole information problem. The organizers were Professors Joseph Polchinski (KITP Santa Barbara) and Pedro Vieira (Perimeter Institute). Sixty-one students heard sixty-two lectures by sixteen lecturers. A Proceedings is in press.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗