Speaker
Description
We present recent results of the Bielefeld-Parma collaboration on the
baryon number density at imaginary chemical potential with
(2+1)-flavors of HISQ fermions on Nt=4,6 and 8 lattices. Based on these
data we calculate Fourier coefficients by means of a Filon-type
quadrature. We discuss how the universal critical behavior is manifest
in the asymptotic behavior of the Fourier coefficients of the baryon
number density. We derive a fit ansatz for the Fourier coefficients by
integrating around the Lee-Yang cut in the complex plane of the
scaling function of the order parameter. Based on this formula we
propose a well defined strategy to locate the position of the Lee-Yang
edge singularities associated with the Roberge Weiss transition and
the chiral transition in QCD. The results are in agreement with
previous results of the Bielefeld-Parma Collaboration based on the
multi-point Pade approach. To that extent, we also present an update of
the continuum extrapolation of the Roberge-Weiss transition temperature.
| Topical area | QCD at Non-zero Density |
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