Topological susceptibility from Nf = 2 + 1 + 1 lattice QCD at nonzero temperature

15th International Conference on Strangeness in Quark Matter

Trunin, Anton^1,4 ; Burger, Florian^2 ; Ilgenfritz, Ernst - Michael^1 ; Lombardo, Maria Paola^3 ; Müller-Preussker, Michael^2

Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Joliot-Curie Str. 6, Dubna

141980, Russia^1

Samara State Aerospace University, Moskovskoye Shosse 34, Samara

443086, Russia^2

Physics Department, Humboldt University Berlin, Newtonstr. 15, Berlin

12489, Germany^3

Frascati National Laboratory, National Institute for Nuclear Physics, Via Enrico Fermi 40, Frascati (Rome)

00044, Italy^4

关键词: Dynamical quarks;    High temperature;    Lattice QCD;    Nonzero temperature;    Scaling relations;    Smoothing methods;    Smoothing techniques;    Topological susceptibility;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/668/1/012123/pdf
DOI  :  10.1088/1742-6596/668/1/012123

来源: IOP

【 摘 要 】

We present results for the topological susceptibility at nonzero temperature obtained from lattice QCD with four dynamical quark flavours. We apply different smoothing methods, including gradient Wilson flow and over-improved cooling, before calculating the susceptibility. It is shown that the considered smoothing techniques basically agree among each other, and that there are simple scaling relations between flow time and the number of cooling/smearing steps. The topological susceptibility exhibits a surprisingly slow decrease at high temperature.