The Phase Diagram of QCD and Some Issues of Large Nc

TL;DR

This paper examines the phase diagram of Quantum Chromodynamics (QCD) in the large Nc limit, highlighting its successes for mesons and challenges for baryons, including paradoxes and phenomenological issues.

Contribution

It critically analyzes the applicability of the large Nc approximation to baryons and discusses unresolved problems and paradoxes in the phase diagram of QCD.

Findings

Large Nc provides good meson phenomenology.

Significant difficulties arise when applying Large Nc to baryons.

Paradoxes and phenomenological issues are identified in the large Nc framework.

Abstract

The large Nc limit provides a good phenomenology of meson spectra and interactions. I discuss some problems with applying the large Nc approximation to the description of baryons, and point out a number of apparent paradoxes and phenomenological difficulties.