---
author:
- 'Mannque <span style="font-variant:small-caps;">Rho</span>$^{1,}$[^1]'
title: |
    Hidden Local Symmetry and the Vector Manifestation\
    of Chiral Symmetry in Hot and/or Dense Matter[^2] 
---

Introduction
============

In the current understanding of quantum chromodynamics (QCD), nearly all of the masses of low-lying hadrons (e.g., $\sim 98$% of the proton mass) come from spontaneous breaking of chiral symmetry. A hot issue raised currently by hadron/nuclear physicists is: How to un-break the broken symmetry in terrestrial laboratories or in compact stellar systems and figure out how the mass is generated to start with. I would like to address this issue in this talk using the framework Gerry Brown and I have been developing since some time, specifically, ideas based on hidden local symmetry, the “vector manifestation" of chiral symmetry and Brown-Rho scaling.

The above question belongs broadly to a class of issues connected to the origin of mass. In a glaring departure from molecules, atoms and nuclei whose masses are nearly fully, say, more than 99%, accounted for by their “elementary" constituents, the bulk of the mass of the nucleon is not given by the masses of its constituents, namely, the quarks. Thus this sets the beginning of a series of mysteries related 