Speaker
Description
The nucleon mass consists of a chiral-variant part and a chiral-invariant part. This mass decomposition is essential for understanding the properties of dense nuclear matter, especially in the high-density region across the chiral phase transition. While the value of the chiral-invariant mass significantly influences the equation of state of neutron stars, its magnitude remains poorly constrained.
In this talk, we present a novel framework to quantitatively determine the chiral-invariant mass by focusing on the nucleon gravitational form factors (GFFs). Assuming the dominance of the lightest sigma meson, we establish a direct connection between the GFFs and the nucleon mass decomposition. Our results are consistent with recent lattice QCD data and suggest a sizable chiral-invariant mass. Furthermore, the obtained value aligns well with neutron star constraints.