Peculiar Velocity Anomaly from Forces Beyond Gravity?
Abstract
We address recently reported anomalously large bulk flows on scales of 100 Mpc/h and beyond. These coherent motions of galaxies challenge the standard LCDM concordance model as well as a large class of competitive models of dark energy and modified gravity. If confirmed, they may support alternative models that include extra couplings inducing enhanced peculiar velocities on large scales. A complementary probe of the evolution of large-scale perturbations is the integrated Sachs-Wolfe effect; we explore the connection between this observable and the bulk flow. For illustration, we consider a coupling between dark energy and dark matter as well as a specific cosmological model, growing neutrino quintessence.
Keywords
Cite
@article{arxiv.0908.2903,
title = {Peculiar Velocity Anomaly from Forces Beyond Gravity?},
author = {Youness Ayaita and Maik Weber and Christof Wetterich},
journal= {arXiv preprint arXiv:0908.2903},
year = {2011}
}
Comments
7 pages, 4 figures; Extended analysis of the connection between ISW and bulk flow measurements; New calculations based on specific cosmological models; Figures, discussion and abstract adjusted; References updated; Text divided into sections