The shear viscosity to entropy density ratio in finite nuclei

TL;DR

This paper investigates the shear viscosity to entropy density ratio in finite nuclei at low temperatures, finding it comparable to the ratios observed in quark-gluon plasma experiments at RHIC.

Contribution

It introduces a method to estimate the viscosity-to-entropy ratio in finite nuclei using giant vibrational state widths, bridging nuclear physics and high-energy experimental results.

Findings

The ratio in finite nuclei is similar to RHIC results.

Giant vibrational state widths can estimate viscosity.

Finite nuclei exhibit low shear-viscosity to entropy-density ratios.

Abstract

Experiments at the Relativistic Heavy Ion Collider (RHIC) suggest that the state of matter produced in the experiments has a low shear-viscosity to entropy-density ratio. We ask here the question what is this ratio in usual finite nuclei at low temperature. We use the experimental and theoretical results for the widths of giant vibrational states in nuclei in order to calculate the above ratio. We find that the values of this ratio are not very different from the ones found in the RHIC experiments.