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