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| Title: | Peculiar Velocities and Large Scale Flows as Probes of Gravity, ΛCDM and the Growth of Structure over Cosmic Time |
| Authors: | Turnbull, Stephen |
| Keywords: | Gravity
ΛCDM
Peculiar Velocities
Growth of Structure |
| Approved Date: | 28-Sep-2012 |
| Date Submitted: | 2013 |
| Abstract: | Peculiar velocities are possibly the most powerful probes of very large-scale mass density fluctuations in the nearby Universe. When coupled with a density field they also can constrain the growth factor of the universe by measuring the proportionality constant between observed velocities and linear theory predicted velocities. In this thesis, I measure a bulk flow of SN within 20,000 km s^1 of 197 +/- 56 km s^1 in direction l = 295 deg +/- 16deg, b = 11deg +/- 14deg , which is consistent with predictions of ΛCDM for large scale mass density fluctuations. Using the IRAS Point Source Catalog Redshift survey (PSCz) galaxy density field and the SNe peculiar velocities I calculated
Ω^55_m σ8 to be 0.40 +/- 0.07 which is in
excellent agreement with the results of WMAP7: Ω^55_m σ8 = 0.39 +/-0.04. By combining my measured value of with results from other studies, I measure the growth factor γ to be = 0.621 +/- 0.08 which is consistent with Λ CDM's prediction of 0.55. I conclude by exploring some of the systematic errors that could have affected my measurements of β. I find that
when β is measured using a reconstruction method the result can be underestimated by
between 7 and 15 %. |
| Program: | Physics |
| Department: | Physics and Astronomy |
| Degree: | Master of Science |
| URI: | http://hdl.handle.net/10012/7079 |
| Appears in Collections: | Electronic Theses and Dissertations (UW)
Faculty of Science Theses and Dissertations
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