Generating Einstein gravity, cosmological constant and Higgs mass from restricted Weyl invariance

TL;DR

This paper demonstrates that a restricted Weyl invariant action in four dimensions can naturally generate Einstein gravity, a cosmological constant, and Higgs mass, while also including an extra scalar field and standard model fields.

Contribution

It introduces a novel approach where restricted Weyl invariance leads to the emergence of Einstein gravity and Higgs mass without explicit mass terms.

Findings

Generated Einstein-Hilbert action from restricted Weyl invariance

Produced a Higgs mass and cosmological constant dynamically

Included an extra massless scalar field coupled to Higgs and gravity

Abstract

Recently, it has been pointed out that dimensionless actions in four dimensional curved spacetime possess a symmetry which goes beyond scale invariance but is smaller than full Weyl invariance. This symmetry was dubbed {\it restricted Weyl invariance}. We show that starting with a restricted Weyl invariant action that includes a Higgs sector with no explicit mass, one can generate the Einstein-Hilbert action with cosmological constant and a Higgs mass. The model also contains an extra massless scalar field which couples to the Higgs field (and gravity). If the coupling of this extra scalar field to the Higgs field is negligibly small, this fixes the coefficient of the nonminimal coupling $R \Phi^2$ between the Higgs field and gravity. Besides the Higgs sector, all the other fields of the standard model can be incorporated into the original restricted Weyl invariant action.