# QCD under extreme conditions - How complex Langevin can help

#### QCD under extreme conditions - How complex Langevin can help

- Event time: 2:00pm until 3:00pm
- Event date: 6th March 2024
- Speaker: Benjamin Jäger (University of Southern Denmark)
- Location: Higgs Centre Seminar Room, Room 4305, James Clerk Maxwell Building (JCMB) (James Clerk Maxwell Building (JCMB)) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

Title: QCD under extreme conditions - How complex Langevin can help

Abstract:

The phase structure of quark matter is essential for understanding the early time of the universe and the formation of matter in the universe. Computer simulations are crucial to guide and complement the extensive search for heavy-ion collision experiments around the world. Surprisingly, very little is known about the phase diagram of the strong force under extreme conditions. The strong interaction is expected to have a rich phase structure in the baryon chemical potential µ and temperature T plane.

Complex Langevin simulations provide an ab initio method to circumvent the sign problem at nonzero baryon density entirely since it is not based on importance sampling but rather on a stochastic exploration of an enlarged configuration space. We use complex Langevin simulations to study the QCD phase diagram with two light quark flavours. In this study, we use Wilson fermions with an intermediate pion mass of ~480 MeV. By studying thermodynamic quantities, in particular at lower temperatures, we are able to describe the equation of state.

### About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..