Topology in the SU(Nf) chiral symmetry restored phase of unquenched QCD and axion cosmology. II.

Vicente Azcoiti
Phys. Rev. D 96, 014505 – Published 13 July 2017

Abstract

We investigate the physical consequences of the survival of the effects of the U(1)A anomaly in the chiral symmetric phase of QCD, and show that the free energy density is a singular function of the quark mass m, in the chiral limit, and that the σ and π¯ susceptibilities diverge in this limit at any TTc. We also show that the difference between the π¯ and δ¯ susceptibilities diverges in the chiral limit at any TTc, a result which seems to be excluded by recent results of Tomiya et al. from numerical simulations of two-flavor QCD. We also discuss on the generalization of these results to the Nf3 model.

  • Received 24 April 2017

DOI:https://doi.org/10.1103/PhysRevD.96.014505

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Vicente Azcoiti

  • Departamento de Física Teórica, Facultad de Ciencias Universidad de Zaragoza, Pedro Cerbuna 9, 50009 Zaragoza, Spain

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Vol. 96, Iss. 1 — 1 July 2017

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