Alternatives to Dark Matter (

  title={Alternatives to Dark Matter (},
  author={Anthony Aguirre},
It has long been known that Newtonian dynamics applied to the visible matter in galaxies and clusters does not correctly describe the dynamics of those systems. While this is generally taken as evidence for dark matter it is in principle possible that instead Newtonian dynamics (and with it General Relativity) breaks down in these systems. Indeed there have been a number of proposals as to how standard gravitational dynamics might be modified so as to correctly explain galactic dynamics without… Expand

Tables from this paper

Numerous astrophysical observations have shown that classical Newtonian dynamics fails on galactic scales and beyond, if only visible matter is taken into account. The two most popular theoreticalExpand
Why do we Still Believe in Newton's Law ? Facts, Myths and Methods in Gravitational Physics
An overview of the experimental and observational status in gravitational physics is given, both for the known tests of general relativity and Newtonian gravity, but also for the increasing number ofExpand
Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
It is shown that many of these puzzling observations are predicted by one single relation — Milgrom’s law — involving an acceleration constant a0 on the order of the square-root of the cosmological constant in natural units. Expand
MOND vs. dark matter in light of historical parallels
MOND is a paradigm that contends to account for the mass discrepancies in the Universe without invoking `dark' components, such as `dark matter' and `dark energy'. It does so by supplanting NewtonianExpand
Cosmology and convention
Abstract I argue that some important elements of the current cosmological model are 'conventionalist’ in the sense defined by Karl Popper. These elements include dark matter and dark energy; both areExpand
Dark Matter in a single-metric universe
A few years ago Baker proposed a metric, implementing the Bona-Stela construction, which interpolates smoothly between the Schwarzschild metric at small scales and the Friedmann-Robertson-WalkerExpand
Weak Lensing of Galaxy Clusters in Modified Newtonian Dynamics
We study weak gravitational lensing of galaxy clusters in terms of the MOND (modified Newtonian dynamics) theory. We calculate shears and convergences of background galaxies for three clustersExpand
Modified gravity, Dark Energy and MOND
We propose a class of actions for the spacetime metric that introduce corrections to the Einstein-Hilbert Lagrangian depending on the logarithm of some curvature scalars. We show that for someExpand
Variable Modified Newtonian Mechanics II: Baryonic Tully Fisher Relation
  • C. C. Wong
  • Physics
  • 2018
Recently we find a single-metric solution for a point mass residing in an expanding universe \cite{wong}, which apart from the Newtonian acceleration, gives rise to an additional MOND-likeExpand
Modified Newtonian Mechanics from an interpolating metric
A few years ago Baker \cite{baker} proposed a Lema$\hat{i}$tre-Tolman metric to interpolate smoothly between the Schwarzschild metric at small scales and the Friedmann-Robertson-Walker (FRW) metricExpand


Modified Newtonian dynamics as an alternative to dark matter
▪ Abstract Modified Newtonian dynamics (MOND) is an empirically motivated modification of Newtonian gravity or inertia suggested by Milgrom as an alternative to cosmic dark matter. The basic idea isExpand
Do modified Newtonian dynamics follow from the cold dark matter paradigm
In a recent paper, Kaplinghat & Turner (KT) advertised that modified Newtonian dynamics (MOND) could be derived naturally in the cold dark matter (CDM) paradigm. They actually proceeded to produce aExpand
How Cold Dark Matter Theory Explains Milgrom's Law
Milgrom noticed the remarkable fact that the gravitational effect of dark matter in galaxies only becomes important where accelerations are less than about 10-8 cm s-2 ~ cH0 ("Milgrom's law"). ThisExpand
Problems for Modified Newtonian Dynamics in Clusters and the Lyα Forest
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 isExpand
Galaxy Dynamics Predictions in the Nonsymmetric Gravitational Theory
In the weak field approximation, the nonsymmetric gravitational theory (NGT) has, in addition to the Newtonian gravitational potential, a Yukawa-like potential produced by the exchange of a spinExpand
We study gravitational lensing by clusters of galaxies in the context of the generic class of unconventional gravity theories which describe gravity in terms of a metric and one or more scalar fieldsExpand
Modified Newtonian dynamics and the Coma cluster
The consistency of Milgrom's theory of modified Newtonian dynamics is checked against optical and X-ray data for the Coma cluster of galaxies. It is found that viable models for the clusterExpand
A modification of the newtonian dynamics as a possible alternative to the hidden mass hypothesis
The author considers the possibility that there is not, in fact, much hidden mass in galaxies and galaxy systems. If a certain modified version of the Newtonian dynamics is used to describe theExpand
A Dearth of Dark Matter in Ordinary Elliptical Galaxies
The kinematics of the outer parts of three intermediate-luminosity elliptical galaxies were studied with the Planetary Nebula Spectrograph. The galaxies' velocity-dispersion profiles were found toExpand
The Virial Discrepancy in Clusters of Galaxies in the Context of Modified Newtonian DynamicsResolving the virial discrepancy in clusters of galaxies with modified Newtonian dynamics
Published in: Astrophys. J. 512 (1999) L23 citations recorded in [Science Citation Index] Abstract: A sample of 197 X-ray emitting clusters of galaxies is considered in the context of Milgrom'sExpand