Sign Problems and Complex Actions

workshop at ECT* Trento

Monday March 2 - Friday March 6 2009


Scientific program:

click here for a pdf version

Monday March 2
09:00 - 10:00 registration
chair: Gert Aarts
10:00 - 11:15 Kim Splittorff QCD with fixed complex fermion determinant
11:15 - 11:45 Coffee
11:45 - 12:30 David Reeb The severity of the sign problem in different regions of the dense-QCD phase diagram
12:30 - 14:00 Lunch
chair: Chris Allton
14:00 - 14:45 Shinji Ejiri A method to avoid the sign problem in finite density
14:45 - 15:30 Jacques Bloch Random matrix theory as playground for the sign problem
15:30 - 16:00 Coffee
16:00 - 17:00 Discussion General (Philippe de Forcrand)
19:00 - 21:00 Buffet

Tuesday March 3
chair: Francesco Di Renzo
09:30 - 10:45 Boris Svistunov Diagrammatic Monte Carlo
10:45 - 11:15 Coffee
11:15 - 12:00 Barak Bringoltz Baryon chemical potential in large N QCD
12:00 - 12:30 Discussion Morning session
12:30 - 14:00 Lunch
chair: Owe Philipsen
14:00 - 14:45 Dean Lee Symmetries, signs, and complex actions in lattice effective field theory
14:45 - 15:30 Atsushi Nakamura Searching paths to understand systems with a complex action
15:30 - 16:00 Coffee
16:00 - 17:00 Panel Discussion Diagrammatics (Shailesh Chandrasekharan)

Wednesday March 4
chair: Philippe de Forcrand
09:30 - 10:45 Ion Stamatescu What can we do with the complex action?
10:45 - 11:15 Coffee
11:15 - 12:00 Erhard Seiler Complex Langevin: Mathematical results and problems
12:00 - 12:30 Discussion Morning session
12:30 - 14:00 Lunch
chair: Kim Splittorff
14:00 - 14:45 Denes Sexty Real time simulations using stochastic quantisation
14:45 - 15:30 Gert Aarts Finite chemical potential with complex Langevin
15:30 - 16:00 Coffee
16:00 - 17:00 Panel Discussion Complex Langevin (Francesco Di Renzo)
20:00 - 23:59 Workshop banquet

Thursday March 5
chair: Dean Lee
09:30 - 10:45 Shailesh Chandrasekharan Solution to sign problems in the worldline approach
10:45 - 11:15 Coffee
11:15 - 12:00 Urs Wenger Solution of a sign problem by explicit bosonisation in two and three dimensions
12:00 - 12:30 Discussion Morning session
12:30 - 14:00 Lunch
chair: Maria-Paola Lombardo
14:00 - 14:45 Philippe de Forcrand Finite temperature and density QCD in the strong coupling limit
14:45 - 15:15 Gergeli Endrodi The curvature of the QCD phase transition line
15:15 - 15:45 Coffee
15:45 - 17:00 Panel Discussion Worldline methods (Gert Aarts)

Friday March 6
chair: Sandor Katz
09:30 - 10:45 Maria-Paola Lombardo Imaginary chemical potential and Taylor expansion: Mix & match
10:45 - 11:15 Coffee
11:15 - 12:00 Massimo D' Elia Issues in analytic continuation: Spectral properties and the critical line
12:00 - 12:30 Discussion Morning session
12:30 - 14:00 Lunch
chair: Shailesh Chandrasekharan
14:00 - 14:45 Bartolome Alles The mass gap of the 2D O(3) model at theta=pi
14:45 - 15:30 Panel Discussion Lattice QCD at finite mu (Owe Philipsen)
15:30 - 16:00 Coffee
16:00 - 17:00 Workshop Summary