Agenda de l’IDP

Séminaire de Physique Théorique

Emergence of the SU(4) symmetry in QCD
Vasily Sazonov (LPT, Paris 11)
Monday 18 December 2017 11:00 -  Tours -  Salle 1180 (Bât E2)

Résumé :
Lattice studies of QCD at temperatures above the chiral restoration and QCD with truncated low modes of the Dirac operator indicate approximate and explicit SU(4) degeneracies in hadron spectra, respectively. At the same time, the QCD classical action and the path integral measure are not invariant under SU(4). Here we investigate SU(4) transformations in the continuum limit by deriving corresponding Ward identities. We show that, if there is a gap in low-lying modes of the Dirac operator the obtained SU(4) Ward identities are simplified and look like they would be if SU(4) symmetry is preserved. Then, we discuss possible consequences for the quark matter at high temperatures.

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