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Physics
Beyond the Standard Models
LQG Legend Writes Paper Claiming GR Explains Dark Matter Phenomena
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[QUOTE="ohwilleke, post: 6847904, member: 19562"] In terms of the magnitude of the effects involved, it is also worth observing that the self-interaction effects hypothesized are second order effects that are swamped by the first order direct gravitational effects except in very weak fields. For example, in a spiral galaxy, up to the radius where the acceleration due to the gravitational field is more than the MOND constant a[sub]0[/sub] the self-interaction effect is just noise that is swamped by the first order, approximately Newtonian gravitational field. So, you have an enhancement of the primary approximately Newtonian gravitational field that is material only at the fringes of the galaxy where the fields are weakest. The depletion effect, likewise, is a depletion from gravitational fields experienced by observers well outside that spiral galaxy in places where that gravitational field is already extreme weak (and the depletion at the level of granularity of a single galaxy is directional with the least depletion in the plane of the spiral galaxy and the most above and below that plane - the depletion function is averaging out that directionality). This is a much more parsimonious way to get the same effects than having a uniform scalar field that pervasively fills all of space time to generate a "dark energy" effect, or a dark matter halo of particles enveloping the entire galaxy and basically cancelling out in the central parts of the galaxy to produce the "dark matter" effect. I also wonder if the seeming acceleration may be due to changes in the amount of depletion that is there over time. Part of the issue is also that the astronomy data is currently interpreted in a moderately model dependent manner, and it isn't obvious that trying to quantify and explain that data in this very different model wouldn't lead to a different top level interpretation of what the raw data implies. For example, none of the omega fractions in LambdaCDM cosmology are numbers that correspond to an actual physical reality in this model. [/QUOTE]
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LQG Legend Writes Paper Claiming GR Explains Dark Matter Phenomena
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