# SIGN22 - Flagship workshop

## The 8th International Workshop on the Sign Problem in QCD and Beyond

## 5-9 September, 2022

(Arrival and reception on

4 September)

## Porter School of Environmental Studies

@ Tel Aviv University

8th International Workshop on the Sign Problem in QCD and Beyond

The workshop will be dedicated to the sign problem.

The sign problem is a computational challenge for simulations of various physical problems. It usually occurs in systems that include fermions, when chemical potential is introduced, in systems with frustration and in other cases. In particular, the problem arises in the study of QCD at high density and as such is relevant to our attempts to understand dense nuclear matter.

The origin of the sign problem can be traced to large cancellations among terms that lead to a final result that is much smaller in absolute value.

While this might seem like a simple nuisance it was argued that in particular cases the sign problem is an NP-hard problem. Hence, it is not expected that a complete solution would be found. Nonetheless, various approaches in particular cases led to significant improvement of our computational abilities. Among these approaches one can mention the Complex Langevin Method, (generalized) Lefschetz Thimbles and other methods based on contour deformations and analytic continuation.

The intended audience of the workshop is that of physicists working on lattice field theory, but we would be happy to host also physicists working on related condensed matter problems and researchers from the field of computer science.

â€‹

Local Organizing Committee:

â€‹

Michael Kroyter (Holon Institute of Technology, Israel)

Benjamin Svetitsky (Tel Aviv University, Israel)

Anatoly Golberg (Holon Institute of Technology, Israel)

â€‹

International Advisory Committee:

â€‹

Gert Aarts (Swansea University, Swansea, UK)

Jacques Bloch (University of Regensburg, Germany)

Shailesh Chandrasekharan (Duke University, United States)

Christof Gattringer (University of Graz, Austria)

Benjamin Jäger (University of Southern Denmark, Odense)

Sandor Katz (Eotvos University, Budapest, Hungary)

Tamas Kovacs (Institute for Nuclear Research, Debrecen, Hungary)

Owe Philipsen (W Goethe University, Frankfurt, Germany)

Uwe-Jens Wiese (University of Bern, Switzerland)

## Invited Key Speakers

Gert Aarts (Swansea University and ECT*, UK)

Andrei Alexandru (George Washington University, USA)

Shailesh Chandrasekharan (Duke University, USA)

Benjamin Jäger (University of Southern Denmark, Denmark)

Sandor Katz (Eotvos University Budapest, Hungary)

Scott Lawrence (University of Colorado, Boulder, USA)

Owe Philipsen (W Goethe University, Frankfurt, Germany)

Dénes Sexty (University of Graz, Austria)Maksim Ulybyshev (University of Wuerzburg, Germany)

Wolfgang Unger (Bielefeld University, Germany)

Neill Warrington (Institute for Nuclear Theory, USA)

Urs Wenger (University of Bern, Switzerland)

Uwe-Jens Wiese (University of Bern, Switzerland)

## Our Sponsors

Making it happen

## The Institute for Theoretical Physics and the Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University

## Past Events

Through the years

Program

### Presentations

Useful and general information: