000058442 001__ 58442
000058442 005__ 20170327111858.0
000058442 0247_ $$2doi$$a10.1103/PhysRevD.94.094505
000058442 0248_ $$2sideral$$a97422
000058442 037__ $$aART-2016-97422
000058442 041__ $$aeng
000058442 100__ $$0(orcid)0000-0002-8215-1413$$aAzcoiti, V.$$uUniversidad de Zaragoza
000058442 245__ $$aTopology in the SU (Nf) chiral symmetry restored phase of unquenched QCD and axion cosmology
000058442 260__ $$c2016
000058442 5060_ $$aAccess copy available to the general public$$fUnrestricted
000058442 5203_ $$aWe investigate the topological properties of unquenched QCD on the basis of numerical results of simulations at fixed topological charge, recently reported by Borsanyi et al. We demonstrate that their results for the mean value of the chiral condensate at fixed topological charge are inconsistent with the analytical prediction of the large-volume expansion around the saddle point, and argue that the most plausible explanation for the failure of the saddle-point expansion is a vacuum energy density that is ¿-independent at high temperatures, but surprisingly not too high (T~2Tc), a result which would imply a vanishing topological susceptibility and the absence of all physical effects of the U(1) axial anomaly at these temperatures. We also show that under a general assumption concerning the high-temperature phase of QCD, where the SU(Nf)A symmetry is restored, the analytical prediction for the chiral condensate at fixed topological charge is in very good agreement with the numerical results of Borsanyi et al., all effects of the axial anomaly should disappear, the topological susceptibility and all the ¿ derivatives of the vacuum energy density vanish, and the theory becomes ¿ independent at any T>Tc in the infinite-volume limit.
000058442 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/FPA2015-65745-P
000058442 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttp://creativecommons.org/licenses/by-nc/3.0/es/
000058442 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000058442 7102_ $$12004$$2405$$aUniversidad de Zaragoza$$bDepartamento de Física Teórica$$cFísica Teórica
000058442 773__ $$g94, 9 (2016), 094505 [9 pp.]$$pPhys. rev., D Part. fields gravit. cosmol.$$tPHYSICAL REVIEW. D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY$$x1550-7998
000058442 8564_ $$s129126$$uhttps://zaguan.unizar.es/record/58442/files/texto_completo.pdf$$yPostprint
000058442 8564_ $$s48590$$uhttps://zaguan.unizar.es/record/58442/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000058442 909CO $$ooai:zaguan.unizar.es:58442$$particulos$$pdriver
000058442 951__ $$a2017-01-13-15:07:53
000058442 980__ $$aARTICLE