Hierarchy in the phase space and dark matter astronomy
We develop a theoretical framework for describing the hierarchical structure of the phase space of cold dark matter haloes, due to gravitationally bound substructures. Because it includes the full hierarchy of the cold dark matter initial conditions and is hence complementary to the halo model, t...
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/54786 https://orcid.org/0000-0003-2480-5973 |
| _version_ | 1826211426497200128 |
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| author | Afshordi, Niayesh Mohayaee, Roya Bertschinger, Edmund |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Afshordi, Niayesh Mohayaee, Roya Bertschinger, Edmund |
| author_sort | Afshordi, Niayesh |
| collection | MIT |
| description | We develop a theoretical framework for describing the hierarchical structure of the phase space
of cold dark matter haloes, due to gravitationally bound substructures. Because it includes the
full hierarchy of the cold dark matter initial conditions and is hence complementary to the halo
model, the stable clustering hypothesis is applied for the first time here to the small-scale phase
space structure. As an application, we show that the particle dark matter annihilation signal could
be up to two orders of magnitude larger than that of the smooth halo within the Galactic virial
radius. The local boost is inversely proportional to the smooth halo density, and thus is O(1) within
the solar radius, which could translate into interesting signatures for dark matter direct detection
experiments: The temporal correlation of dark matter detection can change by a factor of 2 in the
span of 10 years, while there will be significant correlations in the velocity space of dark matter
particles. This can introduce O(1) uncertainty in the direction of local dark matter wind, which was
believed to be a benchmark of directional dark matter searches or the annual modulation signal. |
| first_indexed | 2024-09-23T15:05:42Z |
| format | Article |
| id | mit-1721.1/54786 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:05:42Z |
| publishDate | 2010 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/547862022-09-29T12:40:08Z Hierarchy in the phase space and dark matter astronomy Afshordi, Niayesh Mohayaee, Roya Bertschinger, Edmund Massachusetts Institute of Technology. Department of Physics Bertschinger, Edmund Bertschinger, Edmund We develop a theoretical framework for describing the hierarchical structure of the phase space of cold dark matter haloes, due to gravitationally bound substructures. Because it includes the full hierarchy of the cold dark matter initial conditions and is hence complementary to the halo model, the stable clustering hypothesis is applied for the first time here to the small-scale phase space structure. As an application, we show that the particle dark matter annihilation signal could be up to two orders of magnitude larger than that of the smooth halo within the Galactic virial radius. The local boost is inversely proportional to the smooth halo density, and thus is O(1) within the solar radius, which could translate into interesting signatures for dark matter direct detection experiments: The temporal correlation of dark matter detection can change by a factor of 2 in the span of 10 years, while there will be significant correlations in the velocity space of dark matter particles. This can introduce O(1) uncertainty in the direction of local dark matter wind, which was believed to be a benchmark of directional dark matter searches or the annual modulation signal. United States. National Aeronautics and Space Administration (NASA Grant No. NNG06GG99G) 2010-05-13T18:18:31Z 2010-05-13T18:18:31Z 2010-05 2009-11 Article http://purl.org/eprint/type/SubmittedJournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/54786 Afshordi, Niayesh, Roya Mohayaee and Edmund Bertschinger. "Hierarchy in the Phase Space and Dark Matter Astronomy." Phys. Rev. D 81, 101301(R) (2010). https://orcid.org/0000-0003-2480-5973 en_US http://dx.doi.org/10.1103/PhysRevD.81.101301 Physical Review D Attribution-Noncommercial-Share Alike 3.0 Unported http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf American Physical Society author/dept web page |
| spellingShingle | Afshordi, Niayesh Mohayaee, Roya Bertschinger, Edmund Hierarchy in the phase space and dark matter astronomy |
| title | Hierarchy in the phase space and dark matter astronomy |
| title_full | Hierarchy in the phase space and dark matter astronomy |
| title_fullStr | Hierarchy in the phase space and dark matter astronomy |
| title_full_unstemmed | Hierarchy in the phase space and dark matter astronomy |
| title_short | Hierarchy in the phase space and dark matter astronomy |
| title_sort | hierarchy in the phase space and dark matter astronomy |
| url | http://hdl.handle.net/1721.1/54786 https://orcid.org/0000-0003-2480-5973 |
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