9th International Conference on New Frontiers in Physics (ICNFP 2020)

Electric conductivity in gauge theory with finite-density dynamical fermions

8 Sept 2020, 10:00

30m

Room 1

Talk Plenary

Speaker

Pavel Buividovich (Regensburg University)

Description

We study the dependence of electric conductivity on fermion chemical potential in finite-density $SU(2)$ gauge theory with $N_f=2$ flavours of rooted staggered sea quarks and with Wilson-Dirac and Domain Wall valence quarks. We concentrate in particular on the vicinity of the crossover between the high-temperature and the low-temperature regimes, where we find the low-frequency electric conductivity to be most sensitive to small changes in fermion density. An estimate of the second derivative $\frac{T^2}{\sigma }\frac{{\partial }^2\sigma }{\partial {\mu }^2}\sim 0.05$ is obtained. On the other hand, in the diquark condensation phase at low temperatures and large values of $\mu$ the conductivity quickly grows with chemical potential. As a by-product of our study we confirm the conclusions of previous studies with higher pion masses that for $SU(2)$ gauge theory the ratio of crossover temperature to pion mass $T_c/m_{\pi }$ is significantly smaller than in real QCD.

Details

Dr. Pavel Buividovich, University of Liverpool, Liverpool, UK
https://www.liverpool.ac.uk/mathematical-sciences/

Presentation materials

ICNFP2020.pdf