Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-08-20
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
7 pages, 4 figures; Extended analysis of the connection between ISW and bulk flow measurements; New calculations based on spec
Scientific paper
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.
Ayaita Youness
Weber Maik
Wetterich Christof
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