Workshop on the sign problem in QCD and beyond

Session

Wednesday afternoon (Uwe-Jens Wiese mini-symposium part 2)

22 Jan 2025, 14:00

Lecture Hall 099 (ExWi Building) (University of Bern)

36. Sign Problem Free Qubit Regularized Hamiltonian Lattice Gauge Theories

Prof. Shailesh Chandrasekharan (Duke University)

22/01/2025, 14:00

talk

Qubit regularization may offer a new approach to Hamiltonian lattice gauge theories. If we insist on working with the Kogut Susskind Hamiltonian, one often encounters sign problems even in the pure gauge theory sector. However, since we are ultimately interested in quantum critical points where the form of the Hamiltonian should not play an important role, we can explore if alternate sign...

33. Confronting the sign problem for frustrated magnets

Fakher Assaad

22/01/2025, 14:45

talk

Kitaev materials are a class of crystals that are believed to show fractionalization in terms of Majorana fermions. These models do not allow for negative sign free formulations. Here we show that by optimizing the path integral formulation, we can reach temperature scales down to 40K, a scale relevant to experiments. In fact we will show that we can reproduce experimental...

5. Following Uwe-Jens' Journey of Major Discoveries

Wolfgang Bietenholz

22/01/2025, 16:15

talk

I first met Uwe-Jens in 1992 here at Bern University, where he
introduced me to the lattice field theory. Ever since, he has given
me opportunities to collaborate in a number of projects, all of which
I thoroughly enjoyed. In particular, I was his postdoc from 1994 to
1996 at MIT, and later we crossed paths at numerous locations around
the world.

It is my pleasure to revisit some of...

39. Personal reflections

Shailesh Chandrasekharan

22/01/2025, 17:00

talk