Parity-violating CFT and the gravitational chiral anomaly
We illustrate how the conformal Ward identities (CWI) and the gravitational chiral anomaly completely determine the structure of the ⟨𝑇𝑇𝐽5⟩ (graviton-graviton-chiral gauge current) correlator in momentum space. This analysis extends our previous results on the anomaly vertices ⟨𝐴𝑉𝑉⟩ and ⟨𝐴𝐴𝐴⟩,...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
15 February 2024
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| In: |
Physical review
Year: 2024, Jahrgang: 109, Heft: 4, Pages: 045004-1 - 045004-28 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.109.045004 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.109.045004 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.109.045004 
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| Verfasserangaben: | Claudio Corianò, Stefano Lionetti, and Matteo Maria Maglio |
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| 520 | |a We illustrate how the conformal Ward identities (CWI) and the gravitational chiral anomaly completely determine the structure of the ⟨5⟩ (graviton-graviton-chiral gauge current) correlator in momentum space. This analysis extends our previous results on the anomaly vertices ⟨⟩ and ⟨⟩, as well as the ⟨⟩ parity-odd conformal anomaly vertex in general CFTs. The ⟨5⟩ plays a fundamental role in the analysis of the conformal backreaction in early Universe cosmology, affecting the particle content and the evolution of the primordial plasma. Our approach is nonperturbative and not Lagrangian based, requiring the inclusion of a single anomaly pole in the solution of the anomaly constraint. The pole and its residue, along with the CWIs, determine the entire correlator in all of its sectors (longitudinal/transverse), all of which are proportional to the same anomaly coefficient. The method does not rely on a specific expression of the -odd anomalous current, which in free field theory can be represented either by a bilinear fermion current or by a gauge-dependent Chern-Simons current; it relies solely on the symmetry constraints. We compute the correlator perturbatively at one loop in free field theory and verify its exact agreement with the nonperturbative result. A comparison with the perturbative analysis confirms the presence of a sum rule satisfied by the correlator, similar to the parity-even and the chiral . | ||
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