A tale of two paradigms: the mutual incommensurability of ΛCDM and MOND

By S. McGaugh. 2014

153 citations recorded by the source corpus.

The concordance model of cosmology, ΛCDM, provides a satisfactory description of the evolution of the universe and the growth of large-scale structure. Despite considerable effort, this model does not at present provide a satisfactory description of small-scale structure and the dynamics of bound objects like individual galaxies. In contrast, MOND provides a unique and predictively successful description of galaxy dynamics, but is mute on the subject of cosmology. Here I briefly review these contradictory world views, emphasizing the wealth of distinct interlocking lines of evidence that went into the development of ΛCDM while highlighting the practical impossibility that it can provide a satisfactory explanation of the observed MOND phenomenology in galaxy dynamics. I also briefly review the baryon budget in groups and clusters of galaxies where neither paradigm provides an entirely satisfactory description of the data. Relatively little effort has been devoted to the formation of structure in MOND; I re...

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/ec7d344cc3bc43930ea7f442f136b0eb013531c8

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Citations in the corpus

One Law to Rule Them All: The Radial Acceleration Relation of Galaxies (2016, background): “Several relativistic extensions of MOND have been proposed (see Famaey & McGaugh 2012), but it is unclear whether they can reproduce the cosmic microwave background and the formation of cosmic structures (McGaugh 2015).”
Sterile neutrino Dark Matter (2018, background): “uch as, for example, old stars [7{10]) or by modications of the laws of gravity (for a review see [11{13]) failed to provide a consistent description of all the above phenomena (see the overviews in [13,14]). Therefore, a microscopic origin of DM phenomenon, i.e., a new particle or particles, remain”
Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation (2014, background): “The extreme correlation between the density of dark matter and that of baryons as evidenced by low-surface brightness galaxies has been used as an argument against the SMoC by McGaugh [55], and that observed disk galaxies are much simpler than expected in the SMoC has been demonstrated by Disney et ”
Small-Scale Challenges to the ΛCDM Paradigm (2017, methodology): “We point the reader to reviews by Milgrom (2002), Famaey & McGaugh (2012), and McGaugh (2015), which compare Modified Newtonian Dynamics (MOND) to ΛCDM and provide further references on this topic.”