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Classification of Convergent OPE Channels for Lorentzian CFT Four-Point Functions
by Jiaxin Qiao
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Jiaxin Qiao |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202208_00075v1 (pdf) |
| Date accepted: | 2022-09-01 |
| Date submitted: | 2022-08-28 15:06 |
| Submitted by: | Qiao, Jiaxin |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
We analyze the convergence properties of operator product expansions (OPE) for Lorentzian CFT four-point functions of scalar operators. We give a complete classification of Lorentzian four-point configurations. All configurations in each class have the same OPE convergence properties in s-, t- and u-channels. We give tables including the information of OPE convergence for all classes. Our work justifies that in a subset of the configuration space, Lorentzian CFT four-point functions are genuine analytic functions. Our results are valid for unitary CFTs in $d\geq2$. Our work also provides some Lorentzian regions where one can do bootstrap analysis in the sense of functions.
Author comments upon resubmission
List of changes
According to referee 1:
1. (suggestion 1) Added footnote 4 about the domain of the four-point function.
2. (suggestion 2) Added a comment on the "linear growth condition" at the end of section 6.3.2.
3. (suggestion 4) Added an example concerning different but conformally equivalent causal orderings (section 5.6.2).
4. (suggestion 5) Completed the sentences in summary section 2.2.
According to referee 2:
5. (suggestion 1) Modified the argument on the analyticity of $u^\Delta$ after eq.(34).
6. (suggestion 2) Added explanation in the proof of lemma 3.2.
7. (suggestion 3) Added footnote 9.
According to editor:
8. Added section 5.6.1 on the general time-ordered correlation functions (with the previous section 5.6.1 included). Comment about the maximally-out-of-time-order at the end of section 5.6.1.
Published as SciPost Phys. 13, 093 (2022)