Problems for MOND in Clusters and the Ly-alpha Forest

  title={Problems for MOND in Clusters and the Ly-alpha Forest},
  author={Anthony Aguirre and Joop Schaye and and Eliot Quataert},
The observed dynamics of gas and stars on galactic and larger scales cannot be accounted for by self-gravity, indicating that there are large quantities of unseen matter, or that gravity is non-Newtonian in these regimes. Milgrom's MOdified Newtonian Dynamics (MOND) postulates that Newton's laws are modified at very low acceleration, and can account for the rotation curves of galaxies and some other astrophysical observations, without dark matter. Here we apply MOND to two independent physical… Expand
The Acceleration Scale, Modified Newtonian Dynamics, and Sterile Neutrinos
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 electromagneticExpand
The Modified Newtonian Dynamics Fundamental Plane
Modified Newtonian dynamics (MOND) has been shown to be able to fit spiral galaxy rotation curves as well as giving a theoretical foundation for empirically determined scaling relations, such as theExpand
Alternative to particle dark matter
We propose an alternative to particle dark matter that borrows ingredients of MOdified Newtonian Dynamics (MOND) while adding new key components. The first new feature is a dark matter fluid, in theExpand
Testing quantised inertia on galactic scales
Galaxies and galaxy clusters have rotational velocities (v) apparently too fast to allow them to be gravitationally bound by their visible matter (M). This has been attributed to the presence ofExpand
Testing Emergent Gravity with Optical, X-Ray, and Weak Lensing Measurements in Massive, Relaxed Galaxy Clusters
We test the predictions of Emergent Gravity using matter densities of relaxed, massive clusters of galaxies using observations from optical and X-ray wavebands. We improve upon previous work in thisExpand
The origin of the mass discrepancy-acceleration relation in ΛCDM.
We examine the origin of the mass discrepancy–radial acceleration relation (MDAR) of disc galaxies. This is a tight empirical correlation between the disc centripetal acceleration and that expectedExpand
Marriage à-la-MOND: Baryonic dark matter in galaxy clusters and the cooling flow puzzle
Abstract I start with a brief introduction to MOND phenomenology and its possible roots in cosmology—a notion that may turn out to be the most far reaching aspect of MOND. Next I discuss theExpand
On the proof of dark matter, the law of gravity, and the mass of neutrinos
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 NewtonianExpand
Tidal stripping and the structure of dwarf galaxies in the Local Group
The shallow faint-end slope of the galaxy mass function is usually reproduced in Λ cold dark matter (ΛCDM) galaxy formation models by assuming that the fraction of baryons that turn into stars dropsExpand
The mass discrepancy in disk galaxies is shown to be well correlated with acceleration, increasing systematically with decreasing acceleration below a critical scale a0 � 3700 km 2 s � 2 kpc � 1 ¼Expand