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2 results

  • 5 - Theory Variant T1: A Non-relativistic Lagrangian

  • David Merritt
  • Book:
    A Philosophical Approach to MOND
    Published online:
    20 April 2020
    Print publication:
    30 April 2020, pp 82-116

  • Summary

    The second variant of Milgrom’s theory (T1) derives the equations of motion from a Lagrangian formulation, allowing the theory to make predictions for a very general class of systems with arbitrary shapes. A number of confirmed, novel predictions follow from T1 including the “central surface density relation” (CSDR) and a prediction about the form of the vertical force law in the Milky Way. The theory also predicts a very low rate of mergers between galaxies, a prediction that may or may not be consistent with observations. However, the theory’s predictions about the kinematics of the largest bound structures in the universe, the galaxy clusters, appear to be incorrect.

  • Establishing the relationship between galaxies and dark matter

  • H. J. Mo, X.H. Yang, F.C. van den Bosch, Y.P. Jing, S.M. Weinmann
  • Journal:
    Proceedings of the International Astronomical Union / Volume 2 / Issue S235 / August 2006
    Published online by Cambridge University Press:
    01 August 2006, pp. 43-47
    Print publication:
    August 2006
    • Article
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  • We use two methods to establish the relationship between galaxies and dark matter halos. One is based the conditional luminosity function model, which links galaxies and dark matter halos by matching the number density and clustering properties of galaxies with those of dark matter halos in the current CDM model. The second is based on galaxy systems identified from large redshift surveys of galaxies. The galaxy – dark halo relationships established by these two methods match well, and can provide important constraints on how galaxies form and evolve in the universe.