Speaker
Description
The QCD equation of state (EoS) at non-zero density is the major input for the phenomenological description of many interesting physics systems, such as neutron stars, neutron star merger and heavy-ion collisions. Unfortunately, simulations at large baryon density, or, equivalently, chemical potentials, suffer from the complex action problem, prohibiting the direct computation of the EoS solely from first principles. Changing paradigm, the phase quenching of fermion determinants allows to obtain upper bounds for the pressure at any combination of chemical potentials from numerical simulations. These bounds have been shown to become tight in the weak coupling limit and can be used as input for further phenomenological studies. I will report on our ongoing study concerning the computation of phase quenched pressure bounds. A particular focus is on vanishing temperature and large chemical potentials, relevant for the model-agnostic sampling of the neutron star EoS.