Theoretical Nanophysics

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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 [1]. 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 [2]. 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 [3]. [1] Y. Nishida and D. T. Son, “Nonrelativistic conformal field theories,” Phys. Rev. D 76, 086004 (2007). [2] K. Fujii and Y. Nishida, “Hydrodynamics with spacetime-dependent scattering length,” Phys. Rev. A 98, 063634 (2018). [3] Y. Nishida, “Viscosity spectral functions of resonating fermions in the quantum virial expansion,” Ann. Phys. (2019).

A 450 Theresienstr. 37