Modified Gravity and Large Scale Flows
Abstract
Reconstruction of the local velocity field from the overdensity field and a gravitational acceleration that falls off from a point mass as r^-2 yields velocities in broad agreement with peculiar velocities measured with galaxy distance indicators. MONDian gravity does not. To quantify this, we introduce the velocity angular correlation function as a diagnostic of peculiar velocity field alignment and coherence as a function of scale. It is independent of the bias parameter of structure formation in the standard model of cosmology and the acceleration parameter of MOND. A modified gravity acceleration consistent with observed large scale structure would need to asymptote to zero at large distances more like r^-2, than r^-1.
Cite
@article{arxiv.1504.03027,
title = {Modified Gravity and Large Scale Flows},
author = {Jeremy Mould and Matthew Colless and Pirin Erdogdu and Heath Jones and John Lucey and Yin-Zhe Ma and Christina Magoulas and Christopher M Springob},
journal= {arXiv preprint arXiv:1504.03027},
year = {2015}
}
Comments
to appear in Astrophysics & Space Science; author list revised