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).
- Cosmology: distance scale
- Cosmology: large-scale structure of Universe