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Searches for Dark Matter with IceCube and DeepCore: New constraints on theories predicting dark matter particles
Stockholm University, Faculty of Science, Department of Physics.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The cubic-kilometer sized IceCube neutrino observatory, constructed in the glacial ice at the South Pole, searches indirectly for dark matter via neutrinos from dark matter self-annihilations. It has a high discovery potential through striking signatures. This thesis presents searches for dark matter annihilations in the center of the Sun using experimental data collected with IceCube.

The main physics analysis described here was performed for dark matter in the form of weakly interacting massive particles (WIMPs) with the 79-string configuration of the IceCube neutrino telescope. For the first time, the DeepCore sub-array was included in the analysis, lowering the energy threshold and extending the search to the austral summer. Data from 317 days live-time are consistent with the expected background from atmospheric muons and neutrinos. Upper limits were set on the dark matter annihilation rate, with conversions to limits on the WIMP-proton scattering cross section, which initiates the WIMP capture process in the Sun.These are the most stringent spin-dependent WIMP-proton cross-sections limits to date above 35 GeV for most WIMP models.

In addition, a formalism for quickly and directly comparing event-level IceCube data with arbitrary annihilation spectra in detailed model scans, considering not only total event counts but also event directions and energy estimators, is presented. Two analyses were made that show an application of this formalism to both model exclusion and parameter estimation in models of supersymmetry.

An analysis was also conducted that extended for the first time indirect dark matter searches with neutrinos using IceCube data, to an alternative dark matter candidate, Kaluza-Klein particles, arising from theories with extra space-time dimensions.

The methods developed for the solar dark matter search were applied to look for neutrino emission during a flare of the Crab Nebula in 2010.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2013. , 113 p.
Keyword [en]
Dark matter, neutrinos, neutrino telescopes, IceCube, DeepCore, dark matter experiments
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-89820ISBN: 978-91-7447-716-0 (print)OAI: oai:DiVA.org:su-89820DiVA: diva2:621654
Public defence
2013-06-14, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2013-05-23 Created: 2013-05-10 Last updated: 2013-05-16Bibliographically approved
List of papers
1. Limits on a Muon Flux from Kaluza-Klein Dark Matter Annihilations  in the Sun from the IceCube 22-string Detector
Open this publication in new window or tab >>Limits on a Muon Flux from Kaluza-Klein Dark Matter Annihilations  in the Sun from the IceCube 22-string Detector
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2010 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 81, no 5, 057101- p.Article in journal (Refereed) Published
Abstract [en]

A search for muon neutrinos from Kaluza-Klein dark matter annihilations in the Sun has been performed with the 22-string configuration of the IceCube neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atmospheric background has been observed. Upper limits have been obtained on the annihilation rate of captured lightest Kaluza-Klein particle (LKP) WIMPs in the Sun and converted to limits on the LKP-proton cross sections for LKP masses in the range 250-3000 GeV. These results are the most stringent limits to date on LKP annihilation in the Sun.

National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-41120 (URN)10.1103/PhysRevD.81.057101 (DOI)000276194200102 ()
Projects
IceCube
Note
Publikationen har totalt 259 författare, R. Abbasi et al.Available from: 2010-07-02 Created: 2010-07-02 Last updated: 2017-12-12Bibliographically approved
2. Neutrino Analysis of the 2010 September Crab Nebula Flare and Time-Integrated Constraints on Neutrino Emission from the Crab using IceCube
Open this publication in new window or tab >>Neutrino Analysis of the 2010 September Crab Nebula Flare and Time-Integrated Constraints on Neutrino Emission from the Crab using IceCube
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2012 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 745, no 1, 45- p.Article in journal (Refereed) Published
Abstract [en]

We present the results of a search for high-energy muon neutrinos with the IceCube detector in coincidence with the Crab Nebula flare reported on 2010 September by various experiments. Due to the unusual flaring state of the otherwise steady source we performed a prompt analysis of the 79-string configuration data to search for neutrinos that might be emitted along with the observed γ-rays. We performed two different and complementary data selections of neutrino events in the time window of 10 days around the flare. One event selection is optimized for discovery of E –2 ν neutrino spectrum typical of first-order Fermi acceleration. A similar event selection has also been applied to the 40-string data to derive the time-integrated limits to the neutrino emission from the Crab. The other event selection was optimized for discovery of neutrino spectra with softer spectral index and TeV energy cutoffs as observed for various Galactic sources in γ-rays. The 90% confidence level (CL) best upper limits on the Crab flux during the 10 day flare are 4.73 × 10–11 cm–2 s–1 TeV–1 for an E –2 ν neutrino spectrum and 2.50 × 10–10 cm–2 s–1 TeV–1 for a softer neutrino spectra of E –2.7 ν, as indicated by Fermi measurements during the flare. In this paper, we also illustrate the impact of the time-integrated limit on the Crab neutrino steady emission. The limit obtained using 375.5 days of the 40-string configuration is compared to existing models of neutrino production from the Crab and its impact on astrophysical parameters is discussed. The most optimistic predictions of some models are already rejected by the IceCube neutrino telescope with more than 90% CL.

Keyword
gamma rays: general, ISM: supernova remnants, neutrinos, pulsars: individual (Crab Pulsar)
National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-69590 (URN)10.1088/0004-637X/745/1/45 (DOI)000300316600045 ()
Projects
IceCube
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

266

Available from: 2012-01-14 Created: 2012-01-14 Last updated: 2017-12-08Bibliographically approved
3. Use of event level neutrino telescope data in global fits for theories of new physics
Open this publication in new window or tab >>Use of event level neutrino telescope data in global fits for theories of new physics
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2012 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 11, 057- p.Article in journal (Refereed) Published
Abstract [en]

We present a fast likelihood method for including event-level neutrino telescope data in parameter explorations of theories for new physics, and announce its public release as part of DarkSUSY 5.0.6. Our construction includes both angular and spectral information about neutrino events, as well as their total number. We also present a corresponding measure for simple model exclusion, which can be used for single models without reference to the rest of a parameter space. We perform a number of supersymmetric parameter scans with IceCube data to illustrate the utility of the method: example global fits and a signal recovery in the constrained minimal supersymmetric standard model (CMSSM), and a model exclusion exercise in a 7-parameter phenomenological version of the MSSM. The final IceCube detector con figuration will probe almost the entire focus-point region of the CMSSM, as well as a number of MSSM-7 models that will not otherwise be accessible to e. g. direct detection. Our method accurately recovers the mock signal, and provides tight constraints on model parameters and derived quantities. We show that the inclusion of spectral information significantly improves the accuracy of the recovery, providing motivation for its use in future IceCube analyses.

Keyword
dark matter theory, neutrino astronomy, dark matter experiments, cosmology of theories beyond the SM
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:su:diva-86485 (URN)10.1088/1475-7516/2012/11/057 (DOI)000312263500040 ()
Note

AuthorCount:277;

Available from: 2013-01-14 Created: 2013-01-14 Last updated: 2017-12-06Bibliographically approved
4. Sensitivity of IceCube-DeepCore to Neutralino Dark Matter in the MSSM-25
Open this publication in new window or tab >>Sensitivity of IceCube-DeepCore to Neutralino Dark Matter in the MSSM-25
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2013 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 03, 023- p.Article in journal (Refereed) Published
Abstract [en]

We analyse the sensitivity of IceCube-DeepCore to annihilation of neutralino dark matter in the solar core, generated within a 25 parameter version of the minimally supersymmetric standard model (MSSM-25). We explore the 25-dimensional parameter space using scanning methods based on importance sampling and using DarkSUSY 5.0.6 to calculate observables. Our scans produced a database of 6.02 million parameter space points with neutralino dark matter consistent with the relic density implied by WMAP 7-year data, as well as with accelerator searches. We performed a model exclusion analysis upon these points using the expected capabilities of the IceCube-DeepCore Neutrino Telescope. We show that IceCube-DeepCore will be sensitive to a number of models that are not accessible to direct detection experiments such as SIMPLE, COUPP and XENON100, indirect detection using Fermi-LAT observations of dwarf spheroidal galaxies, nor to current LHC searches.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2013
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:su:diva-89819 (URN)10.1088/1475-7516/2013/03/027 (DOI)000316989200028 ()
Funder
Swedish Research Council, 621-2010-3301; 621-2010-3705
Note

AuthorCount: 8;

Available from: 2013-05-10 Created: 2013-05-10 Last updated: 2017-12-06Bibliographically approved
5. Search for Dark Matter Annihilations in the Sun with the 79-String IceCube Detector
Open this publication in new window or tab >>Search for Dark Matter Annihilations in the Sun with the 79-String IceCube Detector
Show others...
2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 13, 131302- p.Article in journal (Refereed) Published
Abstract [en]

We have performed a search for muon neutrinos from dark matter annihilation in the center of the Sun with the 79-string configuration of the IceCube neutrino telescope. For the first time, the DeepCore subarray is included in the analysis, lowering the energy threshold and extending the search to the austral summer. The 317 days of data collected between June 2010 and May 2011 are consistent with the expected background from atmospheric muons and neutrinos. Upper limits are set on the dark matter annihilation rate, with conversions to limits on spin-dependent and spin-independent scattering cross sections of weakly interacting massive particles (WIMPs) on protons, for WIMP masses in the range 20-5000 GeV=c(2). These are the most stringent spin-dependent WIMP-proton cross section limits to date above 35 GeV=c(2) for most WIMP models. DOI: 10.1103/PhysRevLett.110.131302

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-89715 (URN)10.1103/PhysRevLett.110.131302 (DOI)000316800000001 ()
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

AuthorCount:278;

Available from: 2013-05-08 Created: 2013-05-06 Last updated: 2017-12-06Bibliographically approved

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