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Conformal anomaly and the vector coupling in dense matter

By Chihiro Sasaki, Hyun Kyu Lee, Won-Gi Paeng and Mannque Rho


We construct an effective chiral Lagrangian for hadrons implemented by the conformal invariance and discuss the properties of nuclear matter at high density. The model is formulated based on two alternative assignment, "naive" and mirror, of chirality to the nucleons. It is shown that taking the dilaton limit, in which the mended symmetry of Weinberg is manifest, the vector-meson Yukawa coupling becomes suppressed and the symmetry energy becomes softer as one approaches the chiral phase transition. This leads to softer equations of state (EoS) and could accommodate the EoS without any exotica consistent with the recent measurement of a $1.97 \pm 0.04\,M_\odot$ neutron star.Comment: v2:10 pages, 2 figures, typos corrected, a rough estimate of m0 adde

Topics: High Energy Physics - Phenomenology, Nuclear Theory
Year: 2011
DOI identifier: 10.1103/PhysRevD.84.034011
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