TY  - JOUR
A1  - Baushev, Anton N.
T1  - Principal properties of the velocity distribution of dark matter particles on the outskirts of the Solar system
T2  - Monthly notices of the Royal Astronomical Society
N2  - The velocity distribution of the dark matter particles on the outskirts of the Solar system remains unclear. We suggest to determine it using experimentally found properties of the oldest halo objects. Indeed, the oldest halo stars and globular clusters form a collisionless system, as well as dark matter particles do, and they evolved in the same gravitational field. If we accept this analogy, we can show that the velocity distribution of the dark matter particles should be highly anisotropic and have a sharp maximum near upsilon similar to 500 km s(-1). The distribution is totally different from the Maxwell one.
 We analyse the influence of the distribution function on the results of dark matter detection experiments. It is found that the direct detection signal should differ noticeably from the one calculated from the Maxwell distribution with <upsilon > similar or equal to 220 km s(-1), which is conventional for direct detection experiments (the ratio depends on the detector properties and typically falls within the range between 6 and 0.2). Moreover, the sharp distinction from the Maxwell distribution can be very essential to the observations of dark matter annihilation.
KW  - elementary particles
KW  - methods: analytical
KW  - dark matter
Y1  - 2011
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/36571
SN  - 0035-8711
VL  - 417
IS  - 1
SP  - L83
EP  - L87
PB  - Wiley-Blackwell
CY  - Malden
ER  -