Exploring dark matter with improved numerical techniques
Abstract/Contents
- Abstract
- In this thesis, I discuss several computational physics developments. The context is the study of potential dark matter observables calculated from traditional cosmological N-body simulations. These particle-based simulation techniques often suffer from shot noise when sampling of the density field. Building on the phase space sheet (PSS) interpretation of Abel, Hahn and Kaehler (2012) of cold collisionless fluid, I develop a method for geometrically exact and robust volume- and point-sampling algorithms. These operate on a simplicial tessellation of a 3-manifold embedded in the 6-D phase space, such that the mass is interpolated between particles, which are interpreted as Langrangian flow tracers. This results in a smooth continuous and noise free density field that aids accurate interpretations of cosmological dark matter simulations. I discuss the application of these algorithmic developments to the indirect detection of dark matter (via decay and annihilation), studies of cosmic voids, the cosmic neutrino background, and simulations. I also present recent work on extending these concepts to radiation transport with "adaptive beam tracing." This method extends ray-tracing, which follows 1-dimensional rays along their trajectories, to beam tracing, which instead volume-samples 3-D photon packets called "beams".
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Powell, Devon |
|---|---|
| Degree supervisor | Abel, Tom G, 1970- |
| Thesis advisor | Abel, Tom G, 1970- |
| Thesis advisor | Madejski, Grzegorz |
| Thesis advisor | Wechsler, Risa H. (Risa Heyrman) |
| Degree committee member | Madejski, Grzegorz |
| Degree committee member | Wechsler, Risa H. (Risa Heyrman) |
| Associated with | Stanford University, Department of Physics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Devon Powell. |
|---|---|
| Note | Submitted to the Department of Physics. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Devon M. Powell
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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