Physics of galactic colliders: high speed satellites in LCDM vs MONDian cosmology

Abstract

The statistics of high speed satellite galaxies, as reported in the recent literature, can be a powerful diagnosis of the depth of the potential well of the host halo, and hence discriminate between competing gravitational theories. Naively one expects that high speed satellites are more common in Modified Newtonian Dynamics (MOND) than in cold dark matter (CDM) since an isolated MONDian system has an infinite potential well, while CDM halos have finite potential wells. In this \textit{Letter} we report on an initial test of this hypothesis in the context of the first generation of cosmological simulations utilising a rigorous MONDian Poisson solver. We find that such high speed encounters are approximately a factor of four more common in MOND than in the concordance $\Lambda$CDM model of cosmic structure formation.

arXiv comment4 pages. 2 figures. Accepted for publication in ApJL

References in corpus (28)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• Relativistic gravitation theory for the MOND paradigm
• The evolution substructure I: a new identification method
• Modifying gravity with the Aether: an alternative to Dark Matter
• Revealing the properties of dark matter in the merging cluster MACSJ0025.4-1222
• The speed of the `bullet' in the merging galaxy cluster 1E0657-56
• Dark matter subhalos and the dwarf satellites of the Milky Way
• Discovery of a Ringlike Dark Matter Structure in the Core of the Galaxy Cluster Cl 0024+17
• MLAPM - a C code for cosmological simulations
• Weak Lensing Analysis of the z~0.8 cluster CL 0152-1357 with the Advanced Camera for Surveys
• The dark matter environment of the Abell 901/902 supercluster: a weak lensing analysis of the HST STAGES survey
• Milky Way potentials in CDM and MOND. Is the Large Magellanic Cloud on a bound orbit?
• Escaping from MOND
• Cosmological Structure Formation under MOND: a new numerical solver for Poisson's equation
• How Rare is the Bullet Cluster?
• Coincidences of Dark Energy with Dark Matter -- Clues for a Simple Alternative?
• HST/Acs Weak-Lensing and Chandra X-Ray Studies of the High-Redshift Cluster MS 1054-0321
• The formation of cosmic structure with modified Newtonian dynamics
• Loss of mass and stability of galaxies in MOND
• The Dynamics of Subhalos in Warm Dark Matter Models
• The collision velocity of the bullet cluster in conventional and modified dynamics
• Forming Galaxies with MOND
• Galactic Halos in MONDian Cosmological Simulations
• Asymmetric Gravitational Lenses in TeVeS and Application to the Bullet Cluster
• The Merger in Abell 576: A Line of Sight Bullet Cluster?
• Back-in-time dynamics of the cluster IE 0657-56 (the Bullet System)
• Galaxy Bulges As Tests of CDM vs MOND in Strong Gravity

Cited by in corpus (14)

• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• A simple multigrid scheme for solving the Poisson equation with arbitrary domain boundaries
• ISIS: a new N-body cosmological code with scalar fields based on RAMSES. Code presentation and application to the shapes of clusters
• Structure Formation by Fifth Force I: N-Body vs. Linear Simulations
• Statistics of extreme objects in the Juropa Hubble Volume simulation
• The abundance of galaxy clusters in MOND: Cosmological simulations with massive neutrinos
• Cosmological simulations in MOND: the cluster scale halo mass function with light sterile neutrinos
• Halo velocity profiles in screened modified gravity theories
• Galaxy Cluster Bulk Flows and Collision Velocities in QUMOND
• Modified Kepler's Law, Escape Speed and Two-body Problem in MOND-like Theories
• Challenges for Lambda-CDM and MOND
• Lopsidedness of cluster galaxies in modified gravity
• Dynamical History of the Local Group in $\Lambda$CDM
• Distinguishing screening mechanisms with environment-dependent velocity statistics