Convidamos toda a comunidade do IFGW para o próximo Colóquio da Pós-Graduação:

Título: Conjecture about the QCD Phase Diagram

Palestrante: Prof. Wolfgang Bietenholtz, Department of Gravitation and Field Theory - UNAM, México

Data: 20 de agosto de 2026

Horário: 16h

Local: Auditório do IFGW

--------------------------------

Resumo:

We present a phase diagram study of the O(4) model as an effective theory for 2-flavor QCD. Both theories perform spontaneous symmetry breaking with isomorphic groups, which strongly suggests that they belong to the same universality class. Since we are interested in high temperature, we further assume dimensional reduction to the 3d O(4) model, which implies topological sectors. As conjectured by Skyrme and others, this topological charge represents the baryon number. Hence the baryon chemical potential mu_B appears as an imaginary vacuum angle, which can be included in the lattice simulation without any sign problem. We present numerical results for the critical line in the chiral limit, and for the cross-over in the presence of light quark masses. The shapes of these lines are compatible with other predictions, but up to about mu_B = 300 MeV we did not find a Critical Endpoint, although there are indications that it could be near-by.

Contamos com a sua presença!

Secretaria de Pós-Graduação do IFGW-Unicamp