Speaker
Description
Significant efforts have been made within the heavy-ion collision community to locate the QCD critical endpoint (CEP). Recent lattice QCD studies using imaginary chemical potentials, based on simulations at temperatures above 120 MeV and utilizing Lee-Yang edge singularities in the complex chemical potential plane, suggest that the critical temperature at the CEP, $ T_c^{CEP}$, should be around 110 MeV [1]. Predictions from effective theories, such as AdS/CFT [2], the Functional Renormalization Group (FRG) [3], and Dyson-Schwinger Equations (DSE) [4], align with this lattice result.
In our study, we conduct direct lattice QCD simulations with imaginary chemical potential at a low temperature of 107 MeV, using Highly Improved Staggered Quarks (HISQ) at the physical pion mass on $N_t=10$ lattices. We obtain up to 4th order baryon number fluctuations for each of the 24 values of imaginary baryon chemical potentials ranging from zero to $i\pi$. This enables us to apply multi-point Padé approximants and compute Fourier coefficients of the baryon number density in the complex chemical potential plane. Through these analyses, we examine indications of CEP through the prospective Lee-Yang edge singularities in the complex chemical potential plane at this low temperature.
1 David A. Clarke, et al., arXiv: 2405.10196
2 Mauricio Hippert et al., Phys.Rev.D 110 (2024) 9, 094006
3 Wei-jie Fu, Jan M. Pawlowski, and Fabian Rennecke, Phys. Rev. D 101 (2020) 5, 054032
4 Pascal J. Gunkel and Christian S. Fischer, Phys. Rev. D 104 (2021) 5, 054022
| Category | Theory |
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