Physics PAN Seminar by Dr. Mattia Dalla Brida (CERN, Geneva)

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Date: May 7, 2021
Time: 3:30 p.m. - 4:30 p.m.
Location: ZOOM
Category: Seminar

Physics PAN Seminar by Dr. Mattia Dalla Brida (CERN, Geneva)

Title: The energy-momentum tensor of QCD from a moving frame

Abstract: The energy-momentum tensor (EMT) is a fundamental quantity of any quantum field theory. In QCD, in particular, its correlation functions encode information on the thermodynamic properties of the quark-gluon plasma, as well as on the internal structure of hadrons. Quantitative determinations of these properties require a non-perturbative solution of the theory. At present, lattice QCD is the only known method that allows for first-principles non-perturbative calculations. The application of these techniques, however, necessitates a proper non-perturbative definition of the EMT. The problem is in fact non-trivial due to the explicit breaking of (Euclidean) Poincare' symmetry by the lattice regularization. In this talk, we review the difficulties in devising a practical definition of the EMT in lattice QCD, and present a novel framework to address the problem. The latter is based on studying QCD at finite temperature from the point of view of an observer in a moving reference frame. We shall present how within this framework it is possible to find many compelling identities through which the EMT can be defined. In addition, new ways to compute thermodynamic quantities are possible.



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May 2021