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IDM2008 - Identification of Dark Matter 2008
IDM2008 - Identification of Dark Matter 2008
18-22 August 2008 AlbaNova
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Signatures of the Milky Way's dark disk in current and future experiments (15'+5')
 
T. Bruch, J. I. Read, L.Baudis, G. Lake

In $\Lambda$CDM, massive satellites are dragged into the disk-plane where 
they
dissolve into a stellar thick disk. Recent simulations of galaxy formation revealed
that the dark matter accompanied with the satellites should dissolve as well and 
form
a more massive dark matter disk. The kinematics of the dark disk matches the 
stars
that also entered in the satellites.
The lower velocity with respect to Earth enhances the scattering rates in direct
detection experiments at low recoil energy. Comparison of the rates at low and 
high
recoil energy will improve constrains on the WIMP mass, in particular for masses
$\gtrsim$ 100 GeV. The annual modulation signal from the dark disk is 
significantly
boosted and the phase is shifted by $\sim$ 3 weeks with respect to the dark 
halo. The
variation of the phase with recoil energy can be used to determine the WIMP 
mass once
the dark disk properties are fixed by future astronomical surveys. Finally, the
constraints from current direct detection experiments on the WIMP-nucleon 
scattering
cross section improve by factors of 1.4 to 3.5 if the additional dark matter 
particle
flux from the dark disk is included.
In addition the lower velocity will also increase the capture rate of WIMPs in the
Sun and Earth resulting in higher expected fluxes of annihilation products, like
neutrinos which could be detected by current and future neutrino telescopes. 
In conclusion, there are several distinct features of the dark disk which allow 
the
detection of the dark disk in current and future experiments.
 
Id: 391
Place: AlbaNova
Room: Oskar Klein auditorium
Starting date:
20-Aug-2008   14:30
Duration: 20'
Contribution type: Talk
Primary Authors: Mr. BRUCH, Tobias (University of Zurich, Physics Institute)
Co-Authors: Dr. READ, Justin (University of Zurich, Institue for Theoretical Physics)
Prof. BAUDIS, Laura (University of Zurich, Physics Institute)
Prof. LAKE, George (University of Zurich, Institue for Theoretical Physics)
Presenters: Mr. BRUCH, Tobias
Material: slide Slides
poster Poster
 
Included in session: Dark matter cosmology / structure formation
Included in track: Dark matter cosmology / structure formation
 

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