ELFT HÍRADÓ

[Andras LASZLO <laszlo.andras AT wigner.hu>]

---------- Forwarded message ----------
Date: Fri, 28 Apr 2023 09:32:31 +0200 (CEST)
From: Daniel Nogradi <nogradi AT bodri.elte.hu>
To: Daniel Nogradi <nogradi AT bodri.elte.hu>
Subject: ELTE particle physics seminar - 2 May


Date/Time: 2 May, Tuesday, 14:15

Location: ELTE TTK, second floor, 2.54 Novobatzky room

Speaker: Tamas Gy Kovacs (Eotvos)

Title:  Chiral symmetry, instantons and the Dirac spectrum in hot QCD

Abstract:

The spectrum of the QCD Dirac operator encodes important information about the
physical properties of strongly interacting systems. In particular, the lowest
part of the spectrum is strongly related to the spontaneously and anomalously
broken chiral symmetries and their possible restoration in the quark-gluon
plasma phase. In contrast to standard lore, above the transition temperature 
the
spectral density at zero does not vanish, but it develops a pronounced peak 
that
is presently extensively discussed in the literature because of its influence 
on
chiral symmetry restoration. I will show that the spectral peak can be
understood based on a dilute gas of instantons and antiinstantons. Hopefully
this simple picture can be used to determine the behavior of the spectral peak
in the thermodynamic limit and the chiral limit, two limits that are extremely
hard to access directly by using lattice simulations.

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