Monte-Carlo simulations of QuantumChromoDynamics at finite baryon densities would provide direct insights into cold but dense matter, as it occurs in compact stars. However, standard Monte-Carlo techniques cannot be applied because of the notorious sign problem. Several strategies have been developed over the years to tackle this problem. In this talk, I will first review the nature of the problem in heavy quark QCD at finite density. Then I will present our recent work based on the density-of-states approach, as proposed by Langfeld, Lucini and Rago.
I will show how quantities such as the quark density can be extracted for a wide range of chemical potentials. I will compare our results with the phase quenched approximation.
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..