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"The density in the density of states"

Relatore: Dr Kim Splittorff- NBI - Copenhagen

Sala Feynman
28 Novembre 2013 ore 16.00

The key part of the density of states approach to QCD at nonzero chemical potential is the distribution of the phase of the fermion determinant. We show that this phase angle distribution will appear almost indistinguishable from a Gaussian in large volumes. Corrections to this Gaussian, however, can result in significant corrections to the free energy even if they are down by powers of the volume. In consequence, one must determine the phase angle distribution to a relative accuracy of at least one power, and quite possibly higher powers, of the inverse lattice volume in order to obtain the full free energy in QCD at nonzero chemical potential using the density of states approach.