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arxiv: 2604.03033 · v1 · submitted 2026-04-03 · ✦ hep-ph · hep-th

Recognition: 2 theorem links

· Lean Theorem

Quantum gravity contributions to the gauge and Yukawa couplings in proper time flow

Daniele Rizzo, Dario Zappala, Enrico Maria Sessolo, Gabriele Giacometti, Kamila Kowalska

Authors on Pith no claims yet

Pith reviewed 2026-05-13 18:02 UTC · model grok-4.3

classification ✦ hep-ph hep-th
keywords quantum gravitybeta functionsgauge couplingsYukawa couplingsproper-time flowEinstein-Hilbert truncationfunctional renormalization groupasymptotic safety
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The pith

Quantum gravity contributions to gauge and Yukawa beta functions are derived via the Schwinger proper-time flow equation in the Einstein-Hilbert truncation.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper computes how quantum gravity alters the energy-scale dependence of gauge and Yukawa couplings by applying the Schwinger proper-time flow equation to a matter theory coupled to gravity. Working inside the Einstein-Hilbert truncation, it tracks the dependence of these corrections on gauge-fixing choices and regulator functions, then evaluates them at gravity's interacting fixed point. A sympathetic reader would care because the size of these corrections determines whether they can produce measurable shifts in Standard Model running or generate testable predictions in extensions with new physics. The work also compares the results to those obtained in other renormalization schemes to assess robustness.

Core claim

Using the Schwinger proper-time flow equation in the Einstein-Hilbert truncation, we obtain quantum gravity corrections to the renormalization group beta functions for the gauge and Yukawa couplings in a matter theory. The dependence on the gauge-fixing parameter and the regulator function is investigated, and the gravitational contribution is evaluated at the non-Gaussian fixed point of the gravitational sector. Results are compared with those from other renormalization group schemes, and the magnitude of the corrections is assessed against the values required to generate observable effects in the Standard Model and various new physics scenarios.

What carries the argument

The Schwinger proper-time flow equation, which integrates the renormalization group flow over proper-time scales, applied to the Einstein-Hilbert truncation of gravity coupled to matter fields.

Load-bearing premise

The Einstein-Hilbert truncation together with the chosen proper-time regulator and gauge fixing is sufficient to capture the leading quantum-gravity effects on the matter beta functions.

What would settle it

A calculation of the gravitational corrections to the same beta functions performed in an extended truncation that includes higher-curvature terms such as R squared, yielding substantially different numerical values, would show that the leading-order truncation is insufficient.

Figures

Figures reproduced from arXiv: 2604.03033 by Daniele Rizzo, Dario Zappala, Enrico Maria Sessolo, Gabriele Giacometti, Kamila Kowalska.

Figure 1
Figure 1. Figure 1: fy as a function of the regulator m for G˜ = 1. Solid blue: α = 1, Λ = 0; dashed ˜ blue: α = 1, Λ =˜ −4; dotted red: α = 0, Λ = 0; dot-dashed red: ˜ α = 0, Λ =˜ −4. where we have used the fact that Λ is a constant with respect to both momenta and fields and therefore commutes with both of them. After expanding Eq. (46) we retain the linear order in the Yukawa operator and perform the heat kernel integral, … view at source ↗
Figure 2
Figure 2. Figure 2: Dependence on the gauge-fixing parameter [PITH_FULL_IMAGE:figures/full_fig_p014_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Dependence on the gauge-fixing parameter [PITH_FULL_IMAGE:figures/full_fig_p015_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Isocontour lines of (a) fg and (b) fy in the (Λ˜ ∗ , G˜∗ ) plane, computed in the sharp￾regulator limit of the proper time flow with gauge-fixing parameter α = 1. The markers indicate the gravitational UV fixed points for the SM, B − L, SU(5), and SU(6) matter content. Isocontour lines of (a) fg and (b) fy in the (Λ˜ ∗ , G˜∗ ) plane, computed in the sharp￾regulator limit of the proper time flow with gauge-… view at source ↗
Figure 5
Figure 5. Figure 5: Regulator dependence of the fixed-point values of the Einstein-Hilbert action, [PITH_FULL_IMAGE:figures/full_fig_p021_5.png] view at source ↗
read the original abstract

We derive quantum gravity contributions to the beta functions of the gauge and Yukawa couplings of a matter theory using the Schwinger proper-time flow equation. Working in the Einstein-Hilbert truncation, we investigate the gauge-fixing and regulator dependence of the corresponding renormalization group equations. We quantify the sensitivity of our results on unphysical parameters by evaluating the gravitational correction to the running matter couplings at the interactive fixed point of gravity and we compare our findings with existing determinations in alternative schemes. We finally confront the derived contributions with the typical size they should assume to generate observable low-scale predictions in the Standard Model and in several scenarios of new physics.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Circularity Check

0 steps flagged

No significant circularity detected in the derivation chain

full rationale

The derivation obtains the gravitational corrections to gauge and Yukawa beta functions directly from the Schwinger proper-time flow equation inside the Einstein-Hilbert truncation. Fixed-point values are imported from prior literature as an external input (standard in asymptotic-safety calculations) rather than being fitted or redefined inside the present work. The paper explicitly checks regulator and gauge-fixing dependence within the truncation and compares results against independent schemes, so the central claim does not reduce to its own inputs by construction. No self-definitional, fitted-prediction, or load-bearing self-citation steps are present.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the Einstein-Hilbert truncation for gravity and the validity of the functional renormalization-group flow in the proper-time scheme; no new free parameters or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption Einstein-Hilbert truncation captures the dominant quantum-gravity effects on matter couplings
    Invoked when the flow equations are written and when results are evaluated at the gravity fixed point.

pith-pipeline@v0.9.0 · 5410 in / 1248 out tokens · 53661 ms · 2026-05-13T18:02:59.465078+00:00 · methodology

discussion (0)

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Lean theorems connected to this paper

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Reference graph

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