9 papers
A quark-diquark model for parity doublet structure of baryons
Bikai Gao, Masayasu Harada
The chiral invariant mass of baryons is a phenomenological input of parity doublet models, and its microscopic origin remains an open question. We propose that the chiral invariant…
Origin of hadron mass from gravitational D-form factor and neutron star measurements
Mamiya Kawaguchi, Masayasu Harada, Yong-Liang Ma
Clarifying the origin of hadron mass is one of the fundamental problems in particle physics, relevant from hadronic scales to astrophysical observations. At low energies, this issu…
Implication of neutron star observations to the origin of nucleon mass
Bikai Gao, Xiang Liu, Masayasu Harada +1
We investigate the implications of neutron star observations for understanding the origin of nucleon mass using a framework that combines three complementary approaches: the equati…
Chiral Invariant Mass Constraints from HESS J1731 347 in an Extended Parity Doublet Model with Isovector Scalar Meson
Yuk-Kei Kong, Bikai Gao, Masayasu Harada
The recent discovery of a central compact object (CCO) within the supernova remnant HESS J1731-347, with mass and radius km…
Quarkyonic matter with chiral symmetry restoration
Bikai Gao, Masayasu Harada
We present a novel unified approach to describe the dense symmetric nuclear matter by combining the quarkyonic matter framework with the parity doublet model. This integration allo…
Exploring the first-order phase transition in neutron stars using the parity doublet model and NJL-type quark model
Bikai Gao, Wen-Li Yuan, Masayasu Harada +1
We investigate the possibility and impacts of a first-order phase transition from hadronic matter to quark matter in neutron stars (NSs) using two specific models: the parity doubl…
Nuclear matter and finite nuclei: recent studies based on Parity Doublet Model
Yuk-Kei Kong, Youngman Kim, Masayasu Harada
In this review, we summarize recent studies on nuclear matter and finite nuclei based on parity doublet models. We first construct a parity doublet model (PDM), which includes the…
Reconciling the HESS J1731-347 constraints with Parity doublet model
Bikai Gao, Yan Yan, Masayasu Harada
The recent discovery of a central compact object (CCO) within the supernova remnant HESS J1731-347, characterized by a mass of approximately and a…
Parity doublet model for baryon octets: ground states saturated by good diquarks and the role of bad diquarks for excited states
Bikai Gao, Toru Kojo, Masayasu Harada
Parity doublet model is an effective chiral model that includes the chiral variant and invariant masses of baryons. The chiral invariant mass has large impacts on the density depen…