Observable traces of non-metricity: New constraints on metric-affine gravity
Adrià Delhom-Latorre, Gonzalo J. Olmo, Michele Ronco
Physics Letters B · 2018
doi:10.1016/j.physletb.2018.03.002 (opens in a new tab)
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Abstract
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 Bahbah 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.
Abstract licence: CC BY
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