Holographic Pomeron and Entropy

TL;DR

This paper explores how string theory concepts like the holographic Pomeron relate to entropy production in high-energy dipole scattering, potentially explaining observed multiplicity jumps in collider experiments.

Contribution

It introduces a stringy entropy model for dipole scattering that accounts for multiplicity jumps and predicts outcomes for LHC collisions.

Findings

Stringy entropy is released promptly over a specific timescale.

The model explains the 3/2 jump in charged multiplicities observed experimentally.

Predictions are made for charged multiplicities in various collider collisions.

Abstract

In dipole-dipole scattering at large rapidity \chi={\rm ln}(s/s_0), the induced instanton on the string worldsheet carries entropy S_k=2(\alpha_{Pk}-1)\chi with \alpha_{Pk}-1 the pomeron intercept for a dipole source of N-ality k. This stringy entropy is neither coherent nor thermal. We argue that it is released promptly over a time t_R\approx (b / \chi)^3 / (4 \alpha') with \alpha'/2 the pomeron slope and b the impact parameter. This stringy entropy may explain the 3/2 jump in the total charged multiplicities at about 10 participants reported over a wide range of collider energies by PHOBOS. We predict the charged multiplicities in pp, pA and AA collisions at LHC.