Speaker
Masayuki Kanazawa
(Nagoya University)
Description
The baryon mass originates from spontaneous chiral symmetry breaking and a chiral invariant mass. The chiral invariant mass of hyperons has not been sufficiently considered. In this study, we investigate the dependence of the density at which hyperons appear on their chiral invariant masses in neutron star matter. We employ SU(2)_L x SU(2)_R chiral symmetry and introduce the chiral invariant masses of hyperons independently of the chiral invariant mass of nucleons. We find that the Lambda baryon can emerge in neutron star when the chiral invariant mass is as large as the vacuum mass. Neutron star observations may therefore constrain the chiral invariant mass of Lambda baryon.
Author
Masayuki Kanazawa
(Nagoya University)
Co-author
Masayasu Harada
(Department of Physics, Nagoya University)