Subtle Is The Manifestation Of Chiral Symmetry In Nuclei And Dense Nuclear Matter

TL;DR

This paper reviews the historical development and ongoing research on how chiral symmetry manifests subtly in nuclei and dense nuclear matter, highlighting the complexity and nuanced signals across different density regimes.

Contribution

It provides a personal overview of the evolution of ideas linking chiral symmetry to nuclear physics, emphasizing the subtlety of its manifestations in various nuclear phenomena.

Findings

Chiral symmetry signals are subtle and intricate in nuclear medium.

Development from meson exchange to chiral effective theories has advanced understanding.

Manifestations of chiral symmetry are similar across different density regimes.

Abstract

The history of how chiral symmetry has entered in nuclear physics, in which Gerry Brown and I have participated from 1970 up to today, is described from my personal viewpoint. The route of development we have traversed together goes from meson exchange currents, to "little chiral bag," to chiral effective field theory, to "Brown-Rho scaling" and then to dense matter and chiral phase transition. It has been a great fun and exciting, some right and some wrong in what we have done together, but none that can be dismissed as "not even wrong." We have found all along that whatever signal there may be for the manifestation of chiral symmetry in nuclear medium, be it at low density in meson exchange currents or at high density approaching the chiral phase transition, is very similar in its intricacy and subtlety.