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Physics
Beyond the Standard Models
LQG Legend Writes Paper Claiming GR Explains Dark Matter Phenomena
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[QUOTE="timmdeeg, post: 6864302, member: 73467"] In this paper [URL='https://www.ast.cam.ac.uk/sites/default/files/Invention_DM&DE_Rev1201_011221.pdf']On the Invention of Dark Matter and Dark Energy Craig Mackay, Institute of Astronomy, Cambridge, UK.*[/URL] the author argues with the Einstein-Hilbert Lagrangian (page 6), whereby the nonlinearities take the self-interaction into account. [I]The polynomial comes from expanding gµν around the constant metric ηµν , with the gravitational field φµν = gµν - ηµν . The square brackets indicate sums over Lorentz-invariant terms. Setting n = 0 gives L = [δφδφ], the Lagrangian for Newtonian dynamics. This result is consequent on suppressing higher order (n>0) terms in the Lagrangian and assuming v/c <<1. This asserts that the system under consideration is homogeneous and isotropic, effectively spherically symmetric by setting the Page 7 of 15 energy-momentum tensor, Tµν to be diagonal. Nonlinearities are always part of the full Lagrangian but their effects are suppressed where the system is homogeneous and isotropic. Nonlinearities which arise in the Lagrangians for both GR and QCD are consequent on field self-interaction. ... Most galaxies and clusters of galaxies are clearly inhomogeneous and far from uniform. The additional terms that give rise to the nonlinearity or field [COLOR=rgb(44, 130, 201)]self-interaction[/COLOR] start to become important when √ (GM/L) >~ 10-3 (in “natural” units, see van Remortel, N. (2016) ),where L is the characteristic scale for the system (Deur et al, 2020).[/I] The paper doesn't seem to be peer-reviewed though. [/QUOTE]
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Beyond the Standard Models
LQG Legend Writes Paper Claiming GR Explains Dark Matter Phenomena
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