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The QCD Equation of State in Small Systems
by W. A. Horowitz, Alexander Rothkopf
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Submission summary
| Authors (as registered SciPost users): | William Horowitz |
| Submission information | |
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| Preprint 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) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| 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:
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2022-2-16 (Invited Report)
- Cite as: Anonymous, Report on arXiv:2109.01422v1, delivered 2022-02-16, doi: 10.21468/SciPost.Report.4441
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"