Quantum gravity from Weyl conformal geometry.
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| Title: | Quantum gravity from Weyl conformal geometry. |
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| Authors: | Ghilencea, D. M.1 (AUTHOR) dumitru.ghilencea@cern.ch |
| Source: | European Physical Journal C -- Particles & Fields. Jul2025, Vol. 85 Issue 7, p1-24. 24p. |
| Subjects: | Quantum gravity, Conformal geometry, Particle physics, Weyl groups, Riemannian geometry, Gauge field theory, Clifford algebras |
| Abstract: | We review recent developments in physical implications of Weyl conformal geometry. The associated Weyl quadratic gravity action is a gauge theory of the Weyl group of dilatations and Poincaré symmetry. Weyl conformal geometry is defined by equivalence classes of the metric and Weyl gauge field ( ω μ ), related by Weyl gauge transformations. Weyl geometry can be seen as a covariantised version of Riemannian geometry with respect to Weyl gauge symmetry (of dilatations). This Weyl gauge-covariant formulation of Weyl geometry is metric, which avoids century-old criticisms on the physical relevance of this geometry, that ignored its gauge symmetry. Weyl quadratic gravity and its geometry have interesting properties: (a) Weyl gauge symmetry is spontaneously broken and Einstein–Hilbert gravity and Riemannian geometry are recovered, with Λ > 0 ; (b) this is the only true gauge theory of a space-time symmetry i.e. with a physical (Weyl) gauge boson ( ω μ ); (c) all fields and masses have geometric origin (with no added scalar fields); (d) the theory has a Weyl gauge invariant geometric regularisation (by R ^ ) in d dimensions and it is Weyl-anomaly free; this anomaly is recovered in the broken phase after massive ω μ decouples; (e) the theory is the leading order of the general Weyl gauge invariant Dirac-Born–Infeld (WDBI) action of Weyl conformal geometry in d dimensions; (f) in the limit of vanishing Weyl gauge current, one obtains conformal gravity; (g) finally, Standard Model (SM) has a natural embedding in conformal geometry with no new degrees of freedom, with successful Starobinsky–Higgs inflation. Briefly, Weyl conformal geometry generates a (quantum) gauge theory of gravity, given by Weyl quadratic gravity action and its WDBI generalisation, and leads to a unified description, by the gauge principle, of Einstein–Hilbert gravity and SM interactions. [ABSTRACT FROM AUTHOR] |
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| Abstract: | We review recent developments in physical implications of Weyl conformal geometry. The associated Weyl quadratic gravity action is a gauge theory of the Weyl group of dilatations and Poincaré symmetry. Weyl conformal geometry is defined by equivalence classes of the metric and Weyl gauge field ( ω μ ), related by Weyl gauge transformations. Weyl geometry can be seen as a covariantised version of Riemannian geometry with respect to Weyl gauge symmetry (of dilatations). This Weyl gauge-covariant formulation of Weyl geometry is metric, which avoids century-old criticisms on the physical relevance of this geometry, that ignored its gauge symmetry. Weyl quadratic gravity and its geometry have interesting properties: (a) Weyl gauge symmetry is spontaneously broken and Einstein–Hilbert gravity and Riemannian geometry are recovered, with Λ > 0 ; (b) this is the only true gauge theory of a space-time symmetry i.e. with a physical (Weyl) gauge boson ( ω μ ); (c) all fields and masses have geometric origin (with no added scalar fields); (d) the theory has a Weyl gauge invariant geometric regularisation (by R ^ ) in d dimensions and it is Weyl-anomaly free; this anomaly is recovered in the broken phase after massive ω μ decouples; (e) the theory is the leading order of the general Weyl gauge invariant Dirac-Born–Infeld (WDBI) action of Weyl conformal geometry in d dimensions; (f) in the limit of vanishing Weyl gauge current, one obtains conformal gravity; (g) finally, Standard Model (SM) has a natural embedding in conformal geometry with no new degrees of freedom, with successful Starobinsky–Higgs inflation. Briefly, Weyl conformal geometry generates a (quantum) gauge theory of gravity, given by Weyl quadratic gravity action and its WDBI generalisation, and leads to a unified description, by the gauge principle, of Einstein–Hilbert gravity and SM interactions. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 14346044 |
| DOI: | 10.1140/epjc/s10052-025-14489-z |
