Monday, April 29, 2019

Another Modified Gravity Paper

This paper has interesting things to say, but thinking about gravity modification in terms of a particular radial distance, rather than in terms of a particular gravitational field strength seems to miss one of the core insights about any gravitational modification that must follow from MOND's phenomenological successes. I've listed the references below the fold as it is a quite nice list of papers on gravitational approaches to dark matter phenomena.

Galactic dynamics and long-range quantum gravity

We explore in a systematic way the possibility that long-range quantum gravity effects could play a role at galactic scales and could be responsible for the phenomenology commonly attributed to dark matter. We argue that the presence of baryonic matter breaks the scale symmetry of the de Sitter (dS) spacetime generating an IR scale r0, corresponding to the scale at which the typical dark matter effects we observe in galaxies arise. It also generates a huge number of bosonic excitations with wavelength larger than the size of the cosmological horizon and in thermal equilibrium with dS spacetime. We show that for rr0 these excitations produce a new component for the radial acceleration of stars in galaxies which leads to the result found by McGaugh {\sl et al.} by fitting a large amount of observational data and with the MOND theory. We also propose a generalized thermal equivalence principle and use it to give another independent derivation of our result. Finally, we show that our result can be also derived as the weak field limit of Einstein's general relativity sourced by an anisotropic fluid.
Comments:20 pages, no figures
Subjects:General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Other Condensed Matter (cond-mat.other); Superconductivity (cond-mat.supr-con); High Energy Physics - Theory (hep-th)
Cite as:arXiv:1904.11835 [gr-qc]
(or arXiv:1904.11835v1 [gr-qc] for this version)
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neo said...

this paper ref 37 Mond as regime of QG Lee Smolin

belongs along with Verlinde, the idea that baryonic matter interacts with dark energy to produce MOND

you've previously blog both on gravitational self-interaction as source of MOND and conformal gravity as giving rise to MOND

what would happen if you combine these approaches?

andrew said...

Some day when I have lots of free time at my disposal I'll look at the technical guts of the leading proposals and see how they achieve similar things via different approaches. Until then, I'll simply collect interesting papers for further examination.

neo said...

in news,

there are articles that

1- question Mcgaugh's RAR and
2- second darkmatterless galaxy questioning again MOND