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Pre-launch estimates for GLAST sensitivity to Dark Matter annihilation signals
Stanford, USA.
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
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2008 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 0807, no 013Article in journal (Refereed) Published
Abstract [en]

We investigate the sensitivity of the Gamma-ray Large Area Space Telescope (GLAST) for indirectly detecting weakly interacting massive particles (WIMPs) through the γ-ray signal that their pair annihilation produces. WIMPs are among the favorite candidates for explaining the compelling evidence that about 80% of the mass in the Universe is non-baryonic dark matter (DM). They are serendipitously motivated by various extensions of the standard model of particle physics such as supersymmetry and universal extra dimensions (UED). With its unprecedented sensitivity and its very large energy range (20 MeV to more than 300 GeV) the main instrument on board the GLAST satellite, the Large Area Telescope (LAT), will open a new window of discovery. As our estimates show, the LAT will be able to detect an indirect DM signature for a large class of WIMP models given a cuspy profile for the DM distribution. Using the current state of the art Monte Carlo and event reconstruction software developed within the LAT collaboration, we present preliminary sensitivity studies for several possible sources inside and outside the Galaxy. We also discuss the potential of the LAT to detect UED via the electron/positron channel. Diffuse background modeling and other background issues that will be important in setting limits or seeing a signal are presented

Place, publisher, year, edition, pages
2008. Vol. 0807, no 013
Keyword [en]
mörk materia, gamma-strålning, Fermi/GLAST
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:su:diva-15550DOI: 10.1088/1475-7516/2008/07/013ISI: 000258022800013OAI: oai:DiVA.org:su-15550DiVA: diva2:182070
Note
Totalt 28 författare.Available from: 2008-12-05 Created: 2008-12-05 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Cosmological Dark Matter and the Isotropic Gamma-Ray Background: Measurements and Upper Limits
Open this publication in new window or tab >>Cosmological Dark Matter and the Isotropic Gamma-Ray Background: Measurements and Upper Limits
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis addresses the isotropic diffuse gamma-ray background, as measured by the Fermi gamma ray space telescope, and its implications for indirect detection of dark matter. We describe the measurement of the isotropic background, including also an alternative analysis method besides the one published by the Fermi-LAT collaboration. The measured isotropic diffuse background is compatible with a power law differential energy spectrum with a spectral index of  -2.41 ± 0.05 and -2.39 ± 0.08, for the two analysis methods respectively. This is a softer spectrum than previously reported by the EGRET experiment. This rules out any dominant contribution with a significantly different shape, e.g. from dark matter, in the energy range 20 MeV to 102.4 GeV. Instead we present upper limits on a signal originating from annihilating dark matter of extragalactic origin. The uncertainty in the dark matter signal is primarily dependent on the cosmological evolution of the dark matter distribution. We use recent N-body simulations of structure formation, as well as a semi-analytical calculation, to assess this uncertainty. We investigate three main annihilation channels and find that in some, but not in all, of our scenarios we can start to probe, and sometimes rule out, interesting parameter spaces of particle physics models beyond the standard model.We also investigate the possibility to use the angular anisotropies of the annihilation signal to separate it from a background originating from conventional sources, e.g. from active galactic nuclei. By carefully modelling the performance of the Fermi gamma-ray space telescope and galactic foregrounds we find that this method could be as sensitive as using information from the energy spectrum only.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 118 p.
Keyword
dark matter theory, dark matter simulations, dark matter experiments, isotropic gamma-ray background, Fermi gamma-ray space telescope
National Category
Subatomic Physics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-38900 (URN)978-91-7447-082-6 (ISBN)
Public defence
2010-06-03, FD5, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript.

Available from: 2010-05-11 Created: 2010-05-03 Last updated: 2013-01-22Bibliographically approved

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Bergström, LarsBringmann, TorstenConrad, JanEdsjö, JoakimSellerholm, Alexander
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