arXiv:2404.06538 (astro-ph) [Submitted on 9 Apr 2024] Refracted Gravity Solutions from Small to Large Scales Valentina Cesare
If visible matter alone is present in the Universe, general relativity (GR) and its Newtonian weak field limit (WFL) cannot explain several pieces of evidence, from the largest to the smallest scales. The most investigated solution is the cosmological model Λ cold dark matter (ΛCDM), where GR is valid and two dark components are introduced, dark energy (DE) and dark matter (DM), to explain the ∼70\% and ∼25\% of the mass-energy budget of the Universe, respectively. An alternative approach is provided by modified gravity theories, where a departure of the gravity law from ΛCDM is assumed, and no dark components are included. This work presents refracted gravity (RG), a modified theory of gravity formulated in a classical way where the presence of DM is mimicked by a gravitational permittivity ϵ(ρ) monotonically increasing with the local mass density ρ, which causes the field lines to be refracted in small density environments. Specifically, the flatter the system the stronger the refraction effect and thus, the larger the mass discrepancy if interpreted in Newtonian gravity. RG presented several encouraging results in modelling the dynamics of disk and elliptical galaxies and the temperature profiles of the hot X-ray emitting gas in galaxy clusters and a covariant extension of the theory seems to be promising.
Comments: 32 pages, 9 figures, published on 5th April 2024 in Astronomy 2024, 3(2), 68-99, in the Special Issue "Current Trends in Cosmology"; accepted for publication on 1st April 2024 Subjects: Astrophysics of Galaxies (astro-ph.GA) Cite as: arXiv:2404.06538 [astro-ph.GA] (or arXiv:2404.06538v1 [astro-ph.GA] for this version)
3 comments:
It's quite a collaboration. The works of the other two authors have shown up several times, in the "sBootstrap" thread at Physics Forums.
arXiv:2404.06538 (astro-ph)
[Submitted on 9 Apr 2024]
Refracted Gravity Solutions from Small to Large Scales
Valentina Cesare
If visible matter alone is present in the Universe, general relativity (GR) and its Newtonian weak field limit (WFL) cannot explain several pieces of evidence, from the largest to the smallest scales. The most investigated solution is the cosmological model Λ cold dark matter (ΛCDM), where GR is valid and two dark components are introduced, dark energy (DE) and dark matter (DM), to explain the ∼70\% and ∼25\% of the mass-energy budget of the Universe, respectively. An alternative approach is provided by modified gravity theories, where a departure of the gravity law from ΛCDM is assumed, and no dark components are included. This work presents refracted gravity (RG), a modified theory of gravity formulated in a classical way where the presence of DM is mimicked by a gravitational permittivity ϵ(ρ) monotonically increasing with the local mass density ρ, which causes the field lines to be refracted in small density environments. Specifically, the flatter the system the stronger the refraction effect and thus, the larger the mass discrepancy if interpreted in Newtonian gravity. RG presented several encouraging results in modelling the dynamics of disk and elliptical galaxies and the temperature profiles of the hot X-ray emitting gas in galaxy clusters and a covariant extension of the theory seems to be promising.
Comments: 32 pages, 9 figures, published on 5th April 2024 in Astronomy 2024, 3(2), 68-99, in the Special Issue "Current Trends in Cosmology"; accepted for publication on 1st April 2024
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2404.06538 [astro-ph.GA]
(or arXiv:2404.06538v1 [astro-ph.GA] for this version)
https://doi.org/10.48550/arXiv.2404.06538
@Mitchell
All three of them have done some good quality, thought provoking work that avoids the every so common group think in the subfields involved.
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