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X-WR-CALNAME:Centre for Mathematical Sciences
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X-WR-CALDESC:Events for Centre for Mathematical Sciences
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DTSTART:20200101T000000
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DTSTART;TZID=UTC:20200930T160000
DTEND;TZID=UTC:20200930T170000
DTSTAMP:20230921T182401
CREATED:20200914T163925Z
LAST-MODIFIED:20200924T164242Z
UID:3893-1601481600-1601485200@math-sciences.org
SUMMARY:Pavel Buividovich
DESCRIPTION:Electric conductivity in finite-density lattice gauge theory \nWe study the dependence of the electric conductivity on chemical potential in finite-density SU(2) gauge theory with Nf=2 flavors of rooted staggered sea quarks\, in combination with Wilson-Dirac and Domain Wall valence quarks. We concentrate in particular on the vicinity of the chiral crossover\, where we find the low-frequency electric conductivity to be most sensitive to small changes in chemical potential. Working in the low-density QCD-like regime with spontaneously broken chiral symmetry\, we obtain an estimate of the first nontrivial coefficient of the expansion of conductivity $\sigma(T\,\mu) = \sigma(T\,0) *(1 + c(T) (\mu/T)^2 + O(\mu^4))$ in powers of $\mu$\, which takes its maximal value $c(T) \approx 0.1(5)$ around the critical temperature. At larger densities and lower temperatures\, the conductivity quickly grows towards the diquark condensation phase\, and also becomes closer to the free quark result. As a by-product of our study we confirm the conclusions of previous studies with heavier pion that for SU(2) gauge theory the ratio of crossover temperature to pion mass $T_c/m_{\pi} \approx 0.4$ at $\mu=0$ is significantly smaller than in real QCD.
URL:http://math-sciences.org/event/pavel-buividovich/
LOCATION:Zoom
CATEGORIES:Seminars,Theoretical Physics
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