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Observable traces of non-metricity: new constraints on metric-affine gravity

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arxiv 1709.04249 v2 pith:A2ZDPMVP submitted 2017-09-13 hep-th gr-qc

A. Delhom I Latorre , Gonzalo J. Olmo , Michele Ronco This is my paper · ORCID
classification hep-thgr-qc
keywords non-metricityconstraintsgravitymetric-affineobservableallowallowinganalysis
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Relaxing the Riemannian condition to incorporate geometric quantities such as torsion and non-metricity may allow to explore new physics associated with defects in a hypothetical space-time microstructure. Here we show that non-metricity produces observable effects in quantum fields in the form of 4-fermion contact interactions, thereby allowing us to constrain the scale of non-metricity to be greater than 1 TeV by using results on Bhabha scattering. Our analysis is carried out in the framework of a wide class of theories of gravity in the metric-affine approach. The bound obtained represents an improvement of several orders of magnitude to previous experimental constraints.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Tidal Forces in the Presence of Torsion and Nonmetricity

    gr-qc 2026-06 unverdicted novelty 6.0 of 10

    Tidal acceleration of autoparallels in metric-affine gravity separates into Newtonian gravity plus linear post-Riemannian corrections from torsion and nonmetricity that can be decomposed into irreducible Lorentz components.

  2. Eddington-inspired Born-Infeld gravity: Constraints from the generalized parton distributions (GPDs)

    hep-ph 2025-05 reject novelty 4.0 of 10

    Using the proton's quark pressure profile from a GPD fit, the authors update upper bounds on the EiBI gravity parameter kappa to about 0.1 to 0.3 in the quoted units.

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