High Energy Physics Seminar: Dr. Daisuke Satow
Title: Nambu-Goldstone fermion in QGP and Cold Atom
Abstract: It was suggested that supersymmetry (SUSY) is broken at finite
temperature, and as a result, a Nambu-Goldstone fermion (goldstino)related to SUSY appears. Since dispersion relations of quarks and gluons are almost degenerate at extremely high temperature, quasi-zero energy quark excitation was suggested to exist though QCD does not have exact SUSY. As for the condensed matter system, a setup of cold atom system in which the Hamiltonian has SUSY was proposed, the goldstino was suggested to exist,and the dispersion relation of that mode at zero temperature was obtained recently.
In this talk, we obtain the expressions for the dispersion relation of the goldstino in cold atom system at finite temperature, and compare it with the dispersion of the quasi zero-mode in QCD. Furthermore, we show that the form of the dispersion relation of the goldstino can be understood by using an analogy with a magnon in ferromagnet. We also discuss on how the dispersion relation of the goldstino is reflected in observable quantities in experiment.