The k-th Smallest Dirac Operator Eigenvalue and the Pion Decay Constant

Details The k-th Smallest Dirac Operator Eigenvalue and the Pion Decay Constant The k-th Smallest Dirac Operator Eigenvalue and the Pion Decay Constant

2011-10-31

arxiv.org/abs/1110.6774v2

J. Phys. A: Math. Theor. 45 (2012) 115205

Physics

High Energy Physics

High Energy Physics - Lattice

27 pages, 5 figures; v2: typos corrected, published version

Scientific paper

We derive an analytical expression for the distribution of the k-th smallest Dirac eigenvalue in QCD with imaginary isospin chemical potential in the Dirac operator. Because of its dependence on the pion decay constant F through the chemical potential in the epsilon-regime of chiral perturbation theory this can be used for lattice determinations of that low-energy constant. On the technical side we use a chiral Random-Two Matrix Theory, where we express the k-th eigenvalue distribution through the joint probability of the ordered k smallest eigenvalues. The latter can be computed exactly for finite and infinite N, for which we derive generalisations of Dyson's integration Theorem and Sonine's identity.

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