DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS 2026

• • Tuesday 11 August 2026 at 10:15 in A315 and using Zoom: Christophe Royon (CMS)
    TBA
    Abstract: TBA
  • Monday 24 August 2026 at 14:15 in A315 and using Zoom: Robert D. Pisarski (Brookhaven); Note unusual time!
    Syncreticity with fractional ‘t Hooft determinants in the chiral phase transition
    Abstract: The order of the chiral phase transition at nonzero temperature, T, continues to puzzle. I conjecture that for massless quarks, the chiral phase transition at T_χ is syncretic: terms which break the axial U(1)_A symmetry are fractional powers of ‘t Hooft determinants in the broken phase (for N_c colors, an integer times 1/N_c) but involve only integral powers of ‘t Hooft determinants in the chirally symmetric phase; terms symmetric under U(1)_A remain of the same form for all T and µ. For three flavors, N_f =3, the chiral transition is predicted to be weakly first order, and could well be very weakly. For N_f ≥ 1, the chiral transition is generically “beyond Landau”, as it is for T ≠ 0 and imaginary µ. This can be tested, now, for lattice QCD with 2+1 flavors.

Hopefully the up to 50 min + 10 min discussion long seminar/colloquium will be understandable to a wide audience.
Contacts: Keijo Kajantie (keijo kajantie at helsinki fi) [ HIP seminar],
Tushar Gupta  (tushar.gupta at helsinki fi) [cosmo seminar]

Other related seminars

Friday 10-12 seminar series in D114: Astrophysics seminar
Mathematical Physics Seminar and Workshop series Wed 14-16 in Exactum C123.
InstituteQ Events and Seminars