The acceleration scale, modified Newtonian dynamics and sterile neutrinos

Antonaldo Diaferio, Garry W. Angus

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

General relativity is able to describe the dynamics of galaxies and larger cosmic structures only if most of the matter in the universe is dark, namely, it does not emit any electromagnetic radiation. Intriguingly, on the scale of galaxies, there is strong observational evidence that the presence of dark matter appears to be necessary only when the gravitational field inferred from the distribution of the luminous matter falls below an acceleration of the order of 10-10 m s-2. In the standard model, which combines Newtonian gravity with dark matter, the origin of this acceleration scale is challenging and remains unsolved. On the contrary, the full set of observations can be neatly described, and were partly predicted, by a modification of Newtonian dynamics, dubbed MOND, that does not resort to the existence of dark matter. On the scale of galaxy clusters and beyond, however, MOND is not as successful as on the scale of galaxies, and the existence of some dark matter appears unavoidable. A model combining MOND with hot dark matter made of sterile neutrinos seems to be able to describe most of the astrophysical phenomenology, from the power spectrum of the cosmic microwave background anisotropies to the dynamics of dwarf galaxies. Whether there exists a yet unknown covariant theory that contains general relativity and Newtonian gravity in the weak field limit and MOND as the ultra-weak field limit is still an open question.

Original languageEnglish
Title of host publicationGravity: Where Do We Stand?
PublisherSpringer International Publishing
Pages337-366
Number of pages30
ISBN (Electronic)9783319202242
ISBN (Print)9783319202235
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

dark matter
neutrinos
galaxies
relativity
gravitation
dwarf galaxies
phenomenology
gravitational fields
power spectra
electromagnetic radiation
astrophysics
universe
microwaves
anisotropy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Diaferio, A., & Angus, G. W. (2015). The acceleration scale, modified Newtonian dynamics and sterile neutrinos. In Gravity: Where Do We Stand? (pp. 337-366). Springer International Publishing. https://doi.org/10.1007/978-3-319-20224-2_10
Diaferio, Antonaldo ; Angus, Garry W. / The acceleration scale, modified Newtonian dynamics and sterile neutrinos. Gravity: Where Do We Stand?. Springer International Publishing, 2015. pp. 337-366
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Diaferio, A & Angus, GW 2015, The acceleration scale, modified Newtonian dynamics and sterile neutrinos. in Gravity: Where Do We Stand?. Springer International Publishing, pp. 337-366. https://doi.org/10.1007/978-3-319-20224-2_10

The acceleration scale, modified Newtonian dynamics and sterile neutrinos. / Diaferio, Antonaldo; Angus, Garry W.

Gravity: Where Do We Stand?. Springer International Publishing, 2015. p. 337-366.

Research output: Chapter in Book/Report/Conference proceedingChapter

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Diaferio A, Angus GW. The acceleration scale, modified Newtonian dynamics and sterile neutrinos. In Gravity: Where Do We Stand?. Springer International Publishing. 2015. p. 337-366 https://doi.org/10.1007/978-3-319-20224-2_10