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Bootstrapping Mixed Correlators in Three-Dimensional Cubic Theories
by Stefanos R. Kousvos, Andreas Stergiou
This Submission thread is now published as
|As Contributors:||Stefanos Robert Kousvos · Andreas Stergiou|
|Arxiv Link:||https://arxiv.org/abs/1810.10015v3 (pdf)|
|Date submitted:||2018-11-29 01:00|
|Submitted by:||Stergiou, Andreas|
|Submitted to:||SciPost Physics|
Three-dimensional theories with cubic symmetry are studied using the machinery of the numerical conformal bootstrap. Crossing symmetry and unitarity are imposed on a set of mixed correlators, and various aspects of the parameter space are probed for consistency. An isolated allowed region in parameter space is found under certain assumptions involving pushing operator dimensions above marginality, indicating the existence of a conformal field theory in this region. The obtained results have possible applications for ferromagnetic phase transitions as well as structural phase transitions in crystals. They are in tension with previous $\varepsilon$ expansion results, as noticed already in earlier work.
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Published as SciPost Phys. 6, 035 (2019)
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Anonymous Report 1 on 2019-2-20 (Invited Report)
- Cite as: Anonymous, Report on arXiv:1810.10015v3, delivered 2019-02-20, doi: 10.21468/SciPost.Report.837
1. The paper contains significant, possibly groundbreaking results.
2. The paper is very clearly written.
1. If I had to give one I would say that since the paper is a straightforward application of existing methodology, to compensate for this perhaps more space could have been given to reviewing and discussing existing literature on fixed points with cubic symmetry.
This is a sharp, to the point, nice paper applying conformal bootstrap methods to uncover properties of possible fixed points with cubic symmetry. The main result is the discovery of an island in the space of allowed theories, which suggests the possible existence of a new, hitherto unnoticed CFT with cubic symmetry, dubbed "Platonic CFT". Numeric results seem to be in agreement with measurements of critical exponents for certain structural phase transitions.
I have a few very minor comments given below.
1. Could the authors clarify (for completeness) what is meant by the decoupled Ising model.
2. The long sentence starting just above 1.2 and finishing after 1.3 could be improved a bit in clarity.
3. In 2.1, it's a bit odd at first to say that $\phi_i$ lives in the off-diagonal irrep when this has just been explained as coming from a piece of the symmetric traceless tensor, in the sense that one expects that $\phi_i$ should be coming from the fundamental of O(3). I'm guessing the fundamental of O(3) turns out to transform in the same irrep thanks to eqn. 2.3? If so, might be worth making this more explicit.
4. In 2.7, it is not obvious what irrep $Y'_l$ belongs to, given the notation up to that point. Perhaps the Z in 2.3 could be changed to a Y with a single index, or the Y in 2.7 could be changed to a Z?
5. It would be important for the authors to comment on the dependence of their numerical results on the gap assumption on $\phi'$.
6. It would be useful, if possible, to place the eps-expansion cubic fixed point on the exclusion plots.