Contribution to understanding the phase structure of strong interaction matter: Lee-Yang edge singularities from lattice QCD

We present a calculation of the net baryon number density as a function of imaginary baryon number chemical potential, obtained with highly improved staggered quarks at temporal lattice extent of

N_{τ} = 4

, 6. We construct various rational function approximations of the lattice data and discuss how poles in the complex plane can be determined from them. We compare our results of the singularities in the chemical potential plane to the theoretically expected positions of the Lee-Yang edge singularity in the vicinity of the Roberge-Weiss and chiral phase transitions. We find a temperature scaling that is in accordance with the expected power law behavior.

Note:

22 pages, 22 figures, published version

potential: chemical
quark: staggered
approximation: lattice
baryon number: density
critical phenomena: chiral
temperature: scaling
matter: strong interaction
singularity
lattice field theory
pole

References(71)

Figures(51)

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