2021/01/31 by Marcus Högås, Edvard Mörtsell · 2 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Classical mechanics #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #General relativity #Gravitation #Graviton #Inflation (cosmology) #Massive gravity #Metric expansion of space #Physics #Pulsars and Gravitational Waves Research #Theoretical physics #Universe #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1088/1475-7516/2021/05/001
published in Journal of Cosmology and Astroparticle Physics 2021(05), 001 (Institute of Physics) · 24 pages, 12 figures + appendices. Version 2, slight modifications in accordance with the published version
openalex created_date 2021/02/01 · openalex publication_date 2021/05/01 · arxiv created 2021/05/10 · arxiv updated 2021/05/19 · openalex updated_date 2026/08/05
Abstract Ghost-free bimetric gravity is an extension of general relativity, featuring a massive spin-2 field coupled to gravity. We parameterize the theory with a set of observables having specific physical interpretations. For the background cosmology and the static, spherically symmetric solutions (for example approximating the gravitational potential of the solar system), there are four directions in the parameter space in which general relativity is approached. Requiring that there is a working screening mechanism and a nonsingular evolution of the Universe, we place analytical constraints on the parameter space which rule out many of the models studied in the literature. Cosmological solutions where the accelerated expansion of the Universe is explained by the dynamical interaction of the massive spin-2 field rather than by a cosmological constant, are still viable.