High Energy Physics Seminar: Dr. Hiromichi Nishimura, Brookhaven National Laboratory  Add To Calendar

  • Date(s): Friday, 2/17 1:30 PM to Friday, 2/17 2:30 PM
  • Speaker: Dr. Hiromichi Nishimura
  • Host: Ho-Ung Yee
  • Campus Address: 2214 SES (Science and Engineering South)

Title: Liquid-gas phase transitions in quantum field theories

Abstract: We consider a general class of field theories at finite temperature and density with a sign problem.  Even though charge conjugation is broken at finite density, a combination of charge and complex conjugations, CK symmetry, is unbroken. One consequence of CK symmetry is that the eigenvalues of the mass matrix can be complex, and it gives rise to damped oscillatory behavior in correlation functions.
We argue that this behavior, which is a hallmark of typical liquid-gas systems, is associated with the critical line.  We also consider models for QCD based on both weak and strong couplings and show the existence of such behavior as a consequence of CK-symmetric complex saddle points and non-Hermitian transfer matrix, respectively.

HEP Feb17 flyer