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SUMMARY:Leading-order dynamical QED corrections to the thermodynamics of i
 sospin-asymmetric QCD
DTSTART;VALUE=DATE-TIME:20261010T082500Z
DTEND;VALUE=DATE-TIME:20261010T084500Z
DTSTAMP;VALUE=DATE-TIME:20261005T074644Z
UID:indico-contribution-2806@indico.itp.ac.cn
DESCRIPTION:Speakers: 玮平 黄 (Eötvös Loránd University)\nAt large i
 sospin chemical potential $\\mu_I$ and low temperature\, QCD undergoes a s
 econd-order transition to a Bose-Einstein condensate of charged pions\, wh
 ose order is encoded in the non-analytic $\\mu_I$-dependence of the pressu
 re and of the isospin density derived from it. Including dynamical photons
  is expected\, on general grounds\, to drive this transition first order. 
 Since unequal quark charges render the QCD+QED action complex\, we avoid t
 he sign problem by expanding the pressure to $\\mathcal{O}(e^2)$ around $e
 =0$\, with the leading contribution governed by the second charge-derivati
 ve of the free energy density\, $\\partial^2 f/\\partial e^2|_{e=0}$. We e
 valuate it directly on existing isospin-asymmetric pure-QCD ensembles as a
  spacetime convolution of the Feynman-gauge photon propagator with the vec
 tor current-current correlator at nonzero $\\mu_I$ and pion source $\\lamb
 da$. The full correlator is computed using a point source and a newly prop
 osed two-dimensional planar source. We report progress toward the first la
 ttice determination of $\\partial^2 f/\\partial e^2|_{e=0}$ as a function 
 of $\\mu_I$\, which captures\, at leading order\, the imprint of dynamical
  photons on the thermodynamics across the transition.\n\nhttps://indico.it
 p.ac.cn/event/437/contributions/2806/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2806/
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