Effects of Supersonic Relative Velocity Between Baryons and Dark Matter in the Early Universe
Abstract/Contents
- Abstract
- Evolution of the Universe following cosmic recombination is typically modeled only in linear approximation. Tseliakhovich and Hirata (2010) showed that supersonic bulk relative velocity between cold dark matter and baryonic matter, coherent over scales of tens to hundreds of comoving Mpc, produces important nonlinear effects during this era. We present a new pseudo-spectral simulation code, which is uniquely able to model the nonlinear evolution of the matter density fields beginning at recombination. Using this code, we investigate the relative-velocity effect and quantify the suppression of structure formation on small scales. We demonstrate that the effect is present even by redshift z ~ 400. By z ~ 100, baryonic power has been suppressed by around 40% at scales of k = 80 h/Mpc, as compared with the standard linear theory.
Description
| Type of resource | text |
|---|---|
| Date created | 2012 |
Creators/Contributors
| Author | Peairs, Gregory |
|---|---|
| Degree granting institution | Stanford University, Department of Physics |
| Primary advisor | Wechsler, Risa |
| Advisor | Abel, Tom |
Subjects
| Subject | early Universe |
|---|---|
| Subject | nonlinear evolution models |
| Genre | Thesis |
Bibliographic information
Access conditions
- Use and reproduction
- User agrees that, where applicable, content will not be used to identify or to otherwise infringe the privacy or confidentiality rights of individuals. Content distributed via the Stanford Digital Repository may be subject to additional license and use restrictions applied by the depositor.
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Preferred citation
- Preferred Citation
- Peairs, Gregory (2012). Effects of supersonic relative velocity between baryons and dark matter in the early Universe. Stanford Digital Repository. Available at http://purl.stanford.edu/vv654pm1204.
Collection
Undergraduate Theses, Department of Physics
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- Contact
- skota@stanford.edu
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