Cosmic Flows on 100 h-1Mpc Scales and the Non-Linear σ8

Details Cosmic Flows on 100 h-1Mpc Scales and the Non-Linear σ8 Cosmic Flows on 100 h-1Mpc Scales and the Non-Linear σ8

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..426..158f&link_type=abstract

Proceedings of the 2009 Snowbird Particle Astrophysics and Cosmology Workshop (SNOWPAC 2009), proceedings of a workshop held 1-7

Astronomy and Astrophysics

Astrophysics

Scientific paper

To study galactic motions on the largest available scales, we require bulk flow moments whose window functions have as narrow a peak as possible and having as small an amplitude as possible outside the peak. Typically the moments found using the maximum likelihood estimate weights do not meet these criteria. We present a new method for calculating weights for moments that essentially allow us to “design” the moment’s window function, subject, of course, to the distribution and uncertainties of the available data. The amplitude of cosmological density fluctuations, σ8, has been studied and estimated by analysing many cosmological observations. The values of the estimates vary considerably between the various probes. However, different estimators probe the value of σ8 in different cosmological scales and do not take into account the nonlinear evolution of the parameter at late times. We show that estimates of the amplitude of cosmological density fluctuations derived from cosmic flows are systematically higher than those inferred at early epochs because of nonlinear evolution at later times. Here we derive corrections to the value of σ8 and compare amplitudes after accounting for this effect.

Affiliated with

Also associated with

No associations

Rating

Cosmic Flows on 100 h-1Mpc Scales and the Non-Linear σ8 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cosmic Flows on 100 h-1Mpc Scales and the Non-Linear σ8, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic Flows on 100 h-1Mpc Scales and the Non-Linear σ8 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-954249