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QCD viscosity and BEC-BCS crossover in effective field theory

QCD viscosity and BEC-BCS crossover in effective field theory. Jiunn-Wei Chen ( 陳俊瑋 ) National Taiwan U. Effect Field Theory. Make use of scale separation to integrate out the high energy scales Low energy physics reproduced. Light-by-light Scattering.

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QCD viscosity and BEC-BCS crossover in effective field theory

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  1. QCD viscosity and BEC-BCS crossover in effective field theory Jiunn-Wei Chen (陳俊瑋) National Taiwan U.

  2. Effect Field Theory • Make use of scale separation to integrate out the high energy scales • Low energy physics reproduced

  3. Light-by-light Scattering

  4. QCD viscosity w/ Eiji Nakano, Yan-Han Lee, Yang-Fu Liu • BEC-BCS Crossover w/ Eiji Nakano

  5. QCD Viscosity • Shear viscosity Frictional force

  6. Shear viscosity measures how “perfect” a fluid is!

  7. Kovtun, Son, and Starinets (’05) Conjecture: Shear viscosity / entropy density • Motivated by AdS/CFT

  8. QGP (quark gluon plasma) almost saturates the bound @ just above Tc --- a perfect fluid • What happens below Tc?

  9. Pion gas ChPT (chiral perturbation theory) • Non-perturbative in coupling Boltzman equation

  10. JWC, Nakano

  11. QCD Phase Diagram

  12. The Landscape JWC, Lee, Liu, Nakano

  13. The Landscape

  14. Cold Trapped Atoms Source: C. Regal

  15. Review: Scattering Length Source: C. Regal

  16. BEC-BCS Crossover Changing a at will: Technique of Feshbach Resonance Source: C. Regal

  17. Epsilon Expansion (Nishida and Son) • Computing in dim. • Expanding in • Setting

  18. Why is 4d special? has a singularity at for ground state a free Bose gas

  19. Effective Potential Diagrams

  20. BEC-BCS Crossover in NLO Epsilon Expansion JWC+ E. Nakano (cond-mat/0610011)

  21. BEC-BCS Crossover in NLO Epsilon Expansion JWC+ E. Nakano (cond-mat/0610011)

  22. Outlook • viscosity/entropy: finite chemical potential, BEC-BCS crossover • BEC-BCS crossover in epsilon exp.: NNLO

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