Theoretical Physics Colloquium
QCD at and near finite isospin density
by Prof. Gergely Endrodi (University of Bielefeld)
Tuesday, September 29, 2020 from to (Asia/Kolkata)
The subject of this talk is the phase structure and the equation of state of strongly interacting matter in the presence of an isospin-asymmetry. If sufficiently large, this asymmetry between the up and down quark densities induces various new phases like a Bose-Einstein condensate of charged pions or a BCS-type superconductor made of up and anti-down quark pairs. The pion condensed phase can be particularly relevant for cosmology: recent studies indicate that it might have emerged during the evolution of the early Universe under certain circumstances compatible with observations. I will summarize the recent results for the phase diagram and the equation of state obtained by first-principles lattice QCD simulations, together with the conceptual and technical challenges that these entail. The potential astrophysical implications will also be discussed in some detail.