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Alternatives to dark matter: Modified gravity as an alternative to dark matter
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Alternatives to dark matter: Modified gravity as an alternative to dark matter
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The premier alternative to the dark matter paradigm is modified gravity. Following an introduction to the relevant phenomenology of galaxies, I review the MOND paradigm, an effective summary of the observations which any theory must reproduce. A simple nonlinear modified gravity theory does justice to MOND at the nonrelativistic level, but cannot be elevated to the relativistic level in a unique way. I go in detail into the covariant tensor-vector-theory (TeVeS) which not only recovers MOND but can also deal in detail with gravitational lensing and cosmology. Problems with MOND and TeVeS at the level of clusters of galaxies are given attention. I also summarize the status of TeVeS cosmology.
Forward citations
Cited by 4 Pith papers
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Bridging Superfluid and Nonminimally Coupled BEC Dark Matter through RAQUAL
SFDM’s MONDian phonon–baryon interaction is the Einstein-frame image of BECDM’s Einstein-tensor coupling plus a small Ricci non-minimal term; the kinetic sectors stay inequivalent.
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Bridging Superfluid and Nonminimally Coupled BEC Dark Matter through RAQUAL
SFDM's phonon–baryon force maps onto BECDM's non-minimal Einstein-tensor coupling plus a small Ricci coupling, but the non-analytic kinetic term prevents full dynamical equivalence.
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Galactic dark matter halos: From anisotropic fluids in general relativity to Horava-Lifshitz gravity
A GR Hamiltonian deformation produces an anisotropic fluid that cannot flatten rotation curves, while Horava-Lifshitz produces the right dark-matter scaling only for an imposed power-law LTB ansatz with tight paramete...
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Bridging the gap between dark matter and MOND by a relativistc scalar field approach
A single relativistic scalar field with a Bekenstein-type kinetic term and a mass-generating term reproduces deep-MOND acceleration in the weak-field limit and predicts stronger-than-MOND light bending.
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