SciPost logo

SciPost Submission Page

The QCD Equation of State in Small Systems

by W. A. Horowitz, Alexander Rothkopf

This is not the latest submitted version.

Submission summary

As Contributors: William Horowitz
Arxiv Link: https://arxiv.org/abs/2109.01422v1 (pdf)
Date submitted: 2021-09-14 08:37
Submitted by: Horowitz, William
Submitted to: SciPost Physics Proceedings
Proceedings issue: 50th International Symposium on Multiparticle Dynamics (ISMD2021)
Academic field: Physics
Specialties:
  • High-Energy Physics - Theory
  • High-Energy Physics - Phenomenology
  • Nuclear Physics - Theory
Approaches: Theoretical, Phenomenological

Abstract

We present first results on just such finite system size corrections to the equation of state, trace anomaly, and speed of sound for two model systems: 1) free, massless scalar theory and 2) quenched QCD with periodic boundary conditions (PBC). We further present work-in-progress results for quenched QCD with Dirichlet boundary conditions.

Current status:
Has been resubmitted


Submission & Refereeing History

Resubmission 2109.01422v2 on 2 March 2022

You are currently on this page

Submission 2109.01422v1 on 14 September 2021

Reports on this Submission

Anonymous Report 1 on 2022-2-16 (Invited Report)

Strengths

The structure in terms of a mix of analytic toy model and results from more realistic lattice calculations, with physical comparisons of the two is very nice, and mostly accessible.

Weaknesses

The abstract seems to start mid-paragraph! Some initial context appears to have been accidentally trimmed.

In section 2, should the "phenomenologically relevant T ∼ 400 MeV" be phenomenologically *irrelevant*, since the volume is large and the finite-size effects small? This seems to be the case for the "plates" picture, but not the others, which fit the ~10% effect in the text. This part could do with some expansion to explain the relevance of the plates/tube/box labels, and the logic being used to argue T and TxL values in A+A and p+p systems: to a non-specialist like myself, this bit is interesting but opaque.

It would be good to give more physics context to the trace-anomaly discussion and conclusion: what effect can this reduced coupling / increased speed of sound be expected to have on e.g. flow observables?

Report

A well-written contribution. I would just request a few improvements to the text (cf. the "weaknesses" field) to make it more comprehensible by non-specialists who can't follow the implicit logic or significance in some of the arguments made.

Requested changes

See three issues raised in "weaknesses"

  • validity: high
  • significance: high
  • originality: high
  • clarity: good
  • formatting: excellent
  • grammar: excellent

Login to report or comment