Apparent cosmic acceleration due to large-scale peculiar motions

Details Apparent cosmic acceleration due to large-scale peculiar motions Apparent cosmic acceleration due to large-scale peculiar motions

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jphcs.283a2040t&link_type=abstract

Journal of Physics: Conference Series, Volume 283, Issue 1, pp. 012040 (2011).

Physics

Scientific paper

Observers drifting relative to the smooth Hubble flow have expansion rates different from that of the Universe itself. As a result, observers with small peculiar velocities in linearly perturbed Friedmann universes can experience accelerated expansion, while the universe is actually decelerating. The effect is local, but the affected scales can be large enough to give the (false) impression that the whole universe has recently entered an accelerating phase. Recent surveys reporting large-scale peculiar velocities substantially larger than previously anticipated add a certain degree of observational support to the aforementioned theoretical result.

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