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Can one tell Einstein's unimodular theory from Einstein's general relativity?

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arxiv hep-th/0501146 v3 pith:XFLPVEE4 submitted 2005-01-19 hep-th gr-qc

Enrique Alvarez This is my paper · ORCID
classification hep-thgr-qc
keywords einsteingeneralrelativitytheoryunimodularallowarguedbroad
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The so called unimodular theory of gravitation is compared with general relativity in the quadratic (Fierz-Pauli) regime, using a quite broad framework, and it is argued that quantum effects allow in principle to discriminate between both theories.

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  1. The Goldstone Awakens: Unimodular dark energy in scale-invariant $R^2$ gravity

    astro-ph.CO 2026-07 conditional novelty 5.0 of 10

    In a scale-invariant R² + unimodular-gravity model, the Goldstone boson of scale symmetry becomes thawing dark energy, with its equation of state fixed by the same coupling that sets the inflationary spectral tilt.

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