Volume effect on the extraction of sound velocity in high-energy nucleus-nucleus collisions

TL;DR

This paper investigates how initial-state fluctuations and volume effects influence the extraction of the sound velocity in quark-gluon plasma created in ultra-central heavy-ion collisions, providing necessary corrections for accurate measurements.

Contribution

It introduces a quantitative analysis of volume effects caused by initial-state fluctuations on sound velocity measurements in quark-gluon plasma.

Findings

Initial-state fluctuations cause significant volume effects.

Volume corrections are essential for accurate sound velocity extraction.

Quantitative estimates of these corrections are provided.

Abstract

The determination of the speed of sound in quark-gluon plasma is a crucial aspect of understanding the properties of strongly interacting matter created in relativistic heavy-ion collisions. In this study, we investigate the impact of initial-state fluctuations on the extraction of the speed of sound in a quark-gluon plasma in the ultra-central collisions. By employing the TRENTo model for simulating initial conditions, we demonstrate that these fluctuations lead to sizable volume effect, which in turn corrects the measured values of the sound velocity. With respect to realistic conditions of high-energy heavy-ion experiments, we provide quantitative estimate of these corrections.