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Fujii, Daisuke; Kawaguchi, Mamiya*; Tanaka, Mitsuru*
Proceedings of Science (Internet), 500, p.239_1 - 239_6, 2026/01
Elucidating the mechanisms by which quarks and gluons are confined within hadrons is the most fundamental challenge in QCD. To solve this problem, it is important to understand the role of quark and gluon condensation and the associated spontaneous symmetry breaking in making hadrons. Recently, the stress distribution inside the proton has become experimentally measurable. It is extracted from the gravitational form factors that characterize the matrix elements of the energy-momentum tensor for the proton. This stress distribution is the force that confines quarks and gluons inside hadrons, opening the way to approach the above issues from the viewpoint of stress distribution. In this talk, we investigate the contributions of phenomena reflecting chiral and scale symmetry breaking, such as quark and gluon condensation, to the pressure distribution inside the nucleon, and show that these contributions are essential for stabilizing the nucleon.
Fujii, Daisuke; Hosaka, Atsushi*; Iwanaka, Akihiro*; Sakai, Tadakatsu*; Tachibana, Motoi*
Proceedings of Science (Internet), 500, p.135_1 - 135_6, 2026/01
Understanding strongly coupled QCD matter remains challenging due to its non-perturbative nature. We study finite-density, zero-temperature QCD in a two-flavor hard-wall holographic model with nonzero quark mass. The dense phase is obtained by solving the classical equations of motion under a homogeneous ansatz. To relate bulk fields to boundary observables, we perform holographic renormalization and construct the dictionary, emphasizing the essential role of an IR boundary term at the hard-wall cutoff. Within this setup we uncover a baryonic phase with large baryon number density and a strongly suppressed chiral condensate. From these solutions we derive the equation of state and compute neutron-star mass-radius relations, finding stars above two solar masses over a broad parameter range.
Shim, S.-I.*; Hosaka, Atsushi
Proceedings of Science (Internet), 500, p.010_1 - 010_6, 2026/01
no abstracts in English
from QCD sum rulesSu, N.*; Chen, H.-X.*; Gubler, P.; Hosaka, Atsushi
Proceedings of Science (Internet), 500, p.076_1 - 076_6, 2026/01
Ishikawa, Takatsugu*; Hosaka, Atsushi; Gubler, P.; Sako, Hiroyuki; Tanida, Kiyoshi; 33 of others*
Proceedings of Science (Internet), 500, p.225_1 - 225_5, 2026/01
Gubler, P.
no journal, ,
