On the proof of dark matter, the law of gravity, and the mass of neutrinos

Garry W. Angus, Huan Yuan Shan, Hong Sheng Zhao, Benoit Famaey

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

We develop a new method to predict the density associated with weak-lensing maps of (un)relaxed clusters in a range of theories interpolating between general relativity (GR) and modified Newtonian dynamics (MOND). We apply it to fit the lensing map of the Bullet merging cluster IE 0657-56, in order to constrain more robustly the nature and amount of collisionless matter in clusters beyond the usual assumption of spherical equilibrium (Pointecouteau & Silk) and the validity of GR on cluster scales (Clowe et al.). Strengthening the proposal of previous authors, we show that the Bullet Cluster is dominated by a collisionless - most probably nonbaryonic - component in GR as well as in MOND, a result consistent with the dynamics of many X-ray clusters. Our findings add to the number of known pathologies for a purely baryonic MOND, including its inability to fit the latest data from the Wilkinson Microwave Anisotropy Probe. A plausible resolution of all these issues and standard issues of cold dark matter (CDM) with galaxy rotation curves is the "marriage" of MOND with ordinary hot neutrinos of 2 eV. This prediction is just within the GR-independent maximum of neutrino mass from current β-decay experiments and will be falsifiable by the Karlsruhe Tritium Neutrino (KATRIN) experiment by 2009. Issues of consistency with strong-lensing arcs and the large relative velocity of the two clusters comprising the Bullet Cluster are also addressed.

Original languageEnglish
JournalAstrophysical Journal
Volume654
Issue number1 II
DOIs
Publication statusPublished - Jan 1 2007

Fingerprint

dark matter
neutrinos
gravity
gravitation
tritium
marriage
pathology
relativity
anisotropy
experiment
probe
prediction
silk
Microwave Anisotropy Probe
proposals
arcs
galaxies
microwave
cold
method

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Angus, Garry W. ; Shan, Huan Yuan ; Zhao, Hong Sheng ; Famaey, Benoit. / On the proof of dark matter, the law of gravity, and the mass of neutrinos. In: Astrophysical Journal. 2007 ; Vol. 654, No. 1 II.
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On the proof of dark matter, the law of gravity, and the mass of neutrinos. / Angus, Garry W.; Shan, Huan Yuan; Zhao, Hong Sheng; Famaey, Benoit.

In: Astrophysical Journal, Vol. 654, No. 1 II, 01.01.2007.

Research output: Contribution to journalArticle

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