Talk by Yusuke Nishida on conformality, bulk viscosity, and contact correlation
16.10.2019 at 11:00
This talk is intended to present the interrelationship among conformality, bulk viscosity, and contact correlation, relevant to ultracold atom physics. I will first review the conformal invariance in nonrelativistic systems and its physical consequences on the breathing mode and the bulk viscosity . In particular, the conformal invariance is useful to constrain how the spacetime-dependent scattering length enters hydrodynamics and it proves to naturally couple with the bulk viscosity . This finding can also be derived microscopically by expressing the bulk viscosity in terms of the contact-contact correlation function, which allows us to evaluate the dynamic bulk viscosity systematically with the quantum virial expansion .  Y. Nishida and D. T. Son, “Nonrelativistic conformal field theories,” Phys. Rev. D 76, 086004 (2007).  K. Fujii and Y. Nishida, “Hydrodynamics with spacetime-dependent scattering length,” Phys. Rev. A 98, 063634 (2018).  Y. Nishida, “Viscosity spectral functions of resonating fermions in the quantum virial expansion,” Ann. Phys. (2019).
A 450 Theresienstr. 37