Attractive Holographic Baryons

TL;DR

This paper presents a holographic model of baryon interactions using D7-anti-D7 branes in a non-supersymmetric background, revealing how baryons attract or repel depending on distance and meson exchanges.

Contribution

It introduces a novel holographic framework for baryon interactions incorporating flavor branes and analyzes the balance of forces mediated by mesons.

Findings

At large distances, baryons attract due to a light sigma meson.

Short-range repulsion arises from omega vector meson exchange.

The model predicts conditions for small baryon binding energies.

Abstract

We propose a holographic model of baryon interactions based on non-supersymmetric D7-anti-D7 flavor branes embedded in the Klebanov-Strassler background. The baryons are D3-branes wrapping the 3-sphere of the conifold with M strings connecting the D3 and the flavor branes. Depending on the location of the latter there are two possibilities: the D3 either remains separate from the flavor branes or dissolves in them and becomes a flavor instanton. The leading order interaction between the baryons is a competition between the attraction and the repulsion due to the sigma and omega mesons. The lightest 0++ particle sigma is a pseudo-Goldstone boson associated with the spontaneous breaking of scale invariance. In a certain range of parameters it is parametrically lighter than any other massive state. As a result at large distances baryons attract each other. At short distances the potential admits a repulsive core due to an exchange of the omega vector meson. We discuss baryon coupling to glueballs, massive mesons and pions and point out the condition for the model to have a small binding energy.