English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

General Relativity (GR) exists in different formulations, which areequivalent in pure gravity. Once matter is included, however, observablepredictions generically depend on the version of GR. In order to quantify theresulting ambiguity, we employ metric-affine gravity, which encompasses asspecial cases the metric, Palatini, Einstein-Cartan and Weyl formulations. Wefirst discuss the interaction of fermions with torsion and non-metricity, alsocommenting on projective symmetry. With a view towards the Standard Model, wethen construct a generic model of (complex) scalar, fermionic and gauge fieldscoupled to GR and derive an equivalent metric theory, which features numerousnew interaction terms. As a first observable consequence, we point out that agravitational mechanism for producing dark matter in the form of singletfermions can be used to distinguish between metric gravity and otherformulations of GR.

Coupling Metric-Affine Gravity to the Standard Model and Dark Matter Fermions