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...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/54786 https://orcid.org/0000-0003-2480-5973 |
| Summary: | 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. |
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