arXiv subjects

for RBC-Bielefeld Collaboration

Publications and source records attributed to for RBC-Bielefeld Collaboration.

2 recordsLinked to original sources

arXiv2008

Non-zero density QCD by the Taylor expansion method: The isentropic equation of state, hadronic fluctuations and more

We discuss the Taylor expansion approach to non-zero baryon chemical potential ($μ_B$) and present results on expanion coefficients of the pressure and energy density up to the 6-th order in $μ_B$. Calculations have been performed with (2+1)-flavor of improved staggerd fermions (p4fat3) and almost physical masses on lattices with temporal extent of four and six time slices. We use the expansion coefficients to construct the isentropic equation of state on lines of constant entropy per baryon number and various different hadronic fluctuations. Furthermore, we estimate the radius of convegence of our expansion, which can be seen as a method to analyze the structure of the QCD phase diagram.

hep-lat↗

arXiv2008

Baryon number, strangeness and electric charge fluctuations at zero and non-zero chemical potential

We present results on baryon number, strangeness and electric charge fluctuations in QCD at non-zero density and temperature obtained from lattice calculations with almost physical quark masses. At vanishing chemical potential, i.e. under conditions almost realized at RHIC and the LHC, quartic fluctuations of net baryon number and strangeness are large in a narrow temperature interval characterizing the transition region from the low to the high temperature phase. Our results are based on Taylor expansions in light and strange quark chemical potentials, i.e. we rigorously compute corrections to bulk thermodynamic quantities at non vanishing chemical potential, by performing a Taylor expansion in $μ/T$. We find non-monotonic behavior for the radius of convergence of this series, which could be a hint for a critical end-point in the ($T,μ$)-plane.

hep-lat↗