Suppression of the repulsive force in nuclear interactions near the chiral phase transition

TL;DR

This paper presents an effective chiral Lagrangian incorporating a dilaton to study nuclear interactions near the chiral phase transition, predicting suppression of vector-meson--nucleon interactions at high density.

Contribution

It introduces a dilaton-inclusive chiral Lagrangian and predicts the suppression of vector-meson--nucleon interactions near chiral restoration density.

Findings

Vector-meson--nucleon interaction is strongly suppressed near the dilaton limit.

A linear sigma model emerges from the non-linear structure at high density.

Implications for the thermodynamics of dense baryonic matter are discussed.

Abstract

We introduce an effective chiral Lagrangian with a dilaton responsible for the trace anomaly in QCD. As the "dilaton limit" is taken, which drives a system to near chiral restoration density, a linear sigma model emerges from the highly non-linear structure. A striking prediction is that the vector-meson--nucleon interaction gets strongly suppressed when the dilaton limit is approached. Its phenomenological implications for the thermodynamics of dense baryonic matter are briefly discussed.