Speaker
Dr
Masayasu Hasegawa
(Joint Institute for Nuclear Research)
Description
The existence of monopoles has been theoretically predicted since P. A. M. Dirac introduced the magnetic monopole in quantum mechanics. Moreover, a large number of experiments to observe monopoles have been conducted. Recently, in the field of condensed matter physics, a research group has reported that they created magnetic monopoles in the Bose-Einstein condensate and observed it in the laboratory. In the high energy experiment, observations of monopoles and dyons have been attempted at the Monopole and Exotics Detector at the LHC, however, monopoles have not been detected yet.
The purpose of this research is to find a clue to observe monopoles, which condense in the QCD vacuum and relate to the color confinement, by experiments. In order to find the clue, we add the classical fields of the monopole and the anti-monopole to the QCD vacuum and calculate the Dirac operator of the overlap fermion which preserves the exact chiral symmetry in the lattice gauge theory, from the QCD vacuum. We then estimate catalytic effects of the additional monopole and anti-monopole on the physical quantities by the numerical calculations.
In the study using the configurations of the low temperature, we have already found the additional monopole and anti-monopole form the long loops and create instantons and anti-instantons which closely relate to spontaneous chiral symmetry breaking. We have shown that the value of the chiral condensate (defined as the minus value) decreases, the pion decay constant increases, and the masses of the light quarks and the mesons become heavy, by varying the values of the magnetic charges of the additional monopole and anti-monopole. Finally, we have discovered that the decay width of pion becomes wider and the lifetime of pion becomes shorter than the experimental results, by varying the values of the magnetic charges of the additional monopole and anti-monopole. These are the catalytic effects of monopoles in QCD (arXiv:1807.04808).
In this research, we add the monopole and anti-monopole to the configurations of the finite temperature and investigate catalytic effects of monopoles in QCD on quark confinement-deconfinement phase transition, and chiral symmetry breaking and the restoration. We find that the additional monopole and anti-monopole increase the temperature of quark confinement-deconfinement phase transition, moreover, the restoration of chiral symmetry breaking does not occur, by varying the values of the magnetic charges of the additional monopole and anti-monopole.
In this talk, I would like to present our preliminary results about the catalytic effects of QCD monopoles in the finite temperature.
Primary author
Dr
Masayasu Hasegawa
(Joint Institute for Nuclear Research)
