Alfredo D'Ambrosio (Johann Wolfgang Goethe-Universität)
The so called Columbia Plot summarises the order of the QCD thermal transition as a function of the number of quark flavours and their masses. Recently, it was demonstrated that the first-order chiral transition region, as seen for $N_f=3-6$ on coarse lattices, exhibits tricritical scaling while extrapolating to zero on sufficiently fine lattices. Here we extend these studies to imaginary baryon chemical potentials, using $N_f=4,5$. A similar shrinking of the first-order region is observed with decreasing lattice spacing, which is so far entirely similar to the situation at zero density.
Alfredo D'Ambrosio (Johann Wolfgang Goethe-Universität) Prof. Owe Philipsen (Goethe-University Frankfurt) Reinhold Kaiser