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Alternatives to Dark Matter and Dark Energy
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We review the underpinnings of the standard Newton-Einstein theory of gravity, and identify where it could possibly go wrong. In particular, we discuss the logical independence from each other of the general covariance principle, the equivalence principle and the Einstein equations, and discuss how to constrain the matter energy-momentum tensor which serves as the source of gravity. We identify the a priori assumption of the validity of standard gravity on all distance scales as the root cause of the dark matter and dark energy problems, and discuss how the freedom currently present in gravitational theory can enable us to construct candidate alternatives to the standard theory in which the dark matter and dark energy problems could then be resolved. We identify three generic aspects of these alternate approaches: that it is a universal acceleration scale which determines when a luminous Newtonian expectation is to fail to fit data, that there is a global cosmological effect on local galactic motions which can replace galactic dark matter, and that to solve the cosmological constant problem it is not necessary to quench the cosmological constant itself, but only the amount by which it gravitates.
Forward citations
Cited by 7 Pith papers
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Conformal Gravity and Transformations in the Symmetric Teleparallel Framework
A conformally invariant gravity action built from the square of a non-metricity scalar gives second-order field equations in symmetric teleparallel gravity.
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Renormalized pseudoentropy in dS/CFT
Renormalized holographic pseudoentropy in dS/CFT is constructed from conformal-gravity actions in four and six dimensions, yielding finite sphere values and Mezei-like shape dependence for small deformations.
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New generalization of the Barboza-Alcaniz parametrization of Dark energy
A generalized Barboza-Alcaniz dark-energy parametrization with a free exponent n is fit to cosmological data, but the model analyzed does not actually resolve the future-time problem it was designed to fix.
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Exploring velocity dispersion anisotropy in a dark matter dominated ultra-diffuse galaxy with modified gravity models
For NGC1052-DF44, MOND and RGGR modified gravity fits with free orbital anisotropy match the observed velocity dispersion as well as an NFW dark matter halo.
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Motion of Particles in Solar and Galactic Systems by Using Neumann Boundary Condition
A modified equation of motion with a fitted constant acceleration is shown to reproduce LSB galaxy rotation curves and predict a dark-matter-like mass profile, while also predicting large solar-system perihelion precessions.
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Modified Gravity Theories in Light of the Anomalous Velocity Dispersion of NGC1052-DF2
NGC1052-DF2 and NGC1052-DF4 velocity dispersions are consistent with MOND, MOG, Weyl gravity and GR without dark matter, but Verlinde's emergent gravity is disfavored at D=20 Mpc.
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Quantum-Corrected Thermodynamics of Conformal Weyl Gravity Black Holes: GUP Effects and Phase Transitions
Quantum-corrected thermodynamics of conformal Weyl gravity black holes via GUP and exponential entropy reveals parameter-dependent divergences in heat capacity and shifts in Joule-Thomson inversion points indicating p...
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