Lattice2010

Session

Parallel 39: Nonzero temperature and density

17 Jun 2010, 14:30

Villasimius, Sardinia

231. A study of the complex action problem in a simple model for dynamical compactification in superstring theory using the factorization method.

Konstantinos Anagnostopoulos (National Technical University of Athens)

17/06/2010, 14:30

Nonzero temperature and density

Monte Carlo simulations of matrix models could play an important role in understanding string theories in a similar fashion that lattice QCD has contributed to the understanding of the non-perturbative regime of quantum field theories. The IKKT or IIB matrix model has been proposed as a non--perturbative definition of superstring theory. The model provides a mechanism for the dynamical...

50. How the Quark Number fluctuates in QCD at small chemical potential

Kim Splittorff (The Niels Bohr Institute)

17/06/2010, 14:50

Nonzero temperature and density

We discuss the distribution of the quark number over the gauge fields for QCD at nonzero quark chemical potential. As the quark number operator is non-hermitian, the distribution is over the complex plane. Moreover, because of the fermion determinant, the distribution is not real and positive. The computation is carried out within leading order chiral perturbation theory and gives direct...

212. Poisson statistics in the high temperature QCD Dirac spectrum

Tamas Kovacs (University of Pecs)

17/06/2010, 15:10

Nonzero temperature and density

In the epsilon regime of QCD the low-end of the Dirac spectrum is described by random matrix theory. In contrast, there has been no similarly well established staistical description in the high temperature, chirally symmetric phase. Using lattice simulations I show that at high temperature a band of extremely localized eigenmodes appear at the low-end of the Dirac spectrum. The...

103. Exact results for two-color QCD at low and high density

Tilo Wettig (University of Regensburg)

17/06/2010, 15:30

Nonzero temperature and density

We consider the chiral extension of the real Ginibre ensemble of random matrices with dynamical flavors to study the spectrum of the Dirac operator in two-color QCD with nonzero baryon chemical potential. We show that at maximum non-Hermiticity the random-matrix model is equivalent to the low-energy effective theory at high density in the epsilon regime. We obtain the microscopic...

315. QCD at finite chemical potential in the nilpotency expansion

Fabrizio Palumbo (LNF)

17/06/2010, 15:50

Nonzero temperature and density

The nilpotency expansion is an approach to field theories based on time-dependent Bogoliubov transformations. When the theories are regularized on a lattice we perform independent Bogoliubov transformations at each time slice. The time-dependent parameters of the transformations can naturally be interpreted as bosonic fields associated to bosonic composites of fermions. They are...