Matter Spectral Functions from Quantum Gravity Article Swipe

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Varun Kher , B. E. King , Daniel F. Litim , Manuel Reichert ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2507.17862

We investigate Lorentzian quantum gravity coupled to a template matter sector with gauge fields, scalars and fermions. In the absence of quantised gravity, the matter sector by itself is renormalisable, but UV-incomplete. Provided quantum gravity offers an asymptotically safe UV-completion, we determine the photon and scalar two-point functions in the presence of gravitational fluctuations, and show that both possess a Källén-Lehmann spectral representation. Our results are achieved using functional renormalisation adapted for theories in Lorentzian signature. We explain why and how interactions with gravity modify both the infrared as well as the ultraviolet behaviour of matter spectral functions. We further determine the corresponding form factors on the level of the quantum effective action. Limitations and extensions of our study are discussed alongside implications for particle physics and unitarity of quantum gravity with matter.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2507.17862
PDF: https://arxiv.org/pdf/2507.17862
OA Status: green
OpenAlex ID: https://openalex.org/W4415231672

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DOI: https://doi.org/10.48550/arxiv.2507.17862

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Title: Matter Spectral Functions from Quantum Gravity

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-07-23

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Authors: Varun Kher, B. E. King, Daniel F. Litim, Manuel Reichert

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Landing page: https://arxiv.org/abs/2507.17862

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PDF URL: https://arxiv.org/pdf/2507.17862

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OA status: green

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OA URL: https://arxiv.org/pdf/2507.17862

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Cited by: 0

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