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Research 7: H Silverwood
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Supersymmetric Dark Matter in IceCube
Image Source: NASA/ESA
Hamish SilverwoodDepartment of Physics and Astronomy
University of Canterbury
MSc Supervisors: Jenni Adams and Anthony Brown
Rotational Velocity
Radial Distance
Dark MatterImage Source: Wikimedia and NASA/ESA
Dark MatterImage Source: Wikimedia and NASA/ESA
Candidates must be1. Stable2. Electrically Neutral3. Uncoloured
Supersymmetry
Particles
Light
R-ParityPR = 1
Sparticles
Heavy
R-ParityPR = -1
R-Parity Conservation is necessary for Proton Stability.
Lightest
Supersymmetric
Particle
LSP
LSP P
R = -1 P
R = 1x1 =1
LSP Particles
LSP P
R = -1 P
R = 1x1 =1
LSP Particles
LSP
~χ0Neutralino1. Stable2. Electrically Neutral3. Uncoloured4. Interacts via
Weak Force & Gravity
Dark MatterImage Source: NASA/ESA
Neutralinos are Dark Matter Candidates
Neutralino Accumulation
PR =(-1)x(-1)
= 1
PR = 1x1
=1
LSP Particles
PR =(-1)x(-1)
= 1
PR = 1x1
=1
LSP Particles
νNeutrinos
▪
▪
▪
ICECUBENEUTRINOOBSERVATORY
Detector Optical Module
Minimally
Supersymmetric
Standard
Model
MSSM
MSSM: 120 Free Parameters
MSSM-25: 25 Free Parameters
Scanning the MSSM-25 Parameter Space
DarkSUSY
●LSP Type●LSP Mass●Relic Density●Capture Rate●Annihilation
Rate
●IceCube events,rates, and likelihoods
▪▪▪Modifed by HS
to run with 25 Parameters
Scanning the MSSM-25 Parameter Space
DarkSUSY
●LSP Type●LSP Mass●Relic Density●Capture Rate●Annihilation
Rate
●IceCube events,rates, and likelihoods
▪▪▪
Fitness Criteria is Relic Density;optimizing towards WMAP measurement.
Modifed by HS to run with 25
Parameters
Scanning the MSSM-25 Parameter Space
Scanning the MSSM-25 Parameter Space
Scanning the MSSM-25 Parameter Space
Scanning the MSSM-25 Parameter Space
Final Goal of Parameter Scans
IceCube Event Simulations
Final Goal of Parameter Scans
IceCube Event Simulations
The Gritty Details
●Monte Carlo methods used to scan parameter space.
●Currently running scans based on the VEGAS algorithm.
Conclusion●SUSY supplies us with a Dark Matter candidate particle: the neutralino.
●IceCube can potentially detect the annihilation of these neutralinos in the Sun.
●Scans of the MSSM-25 parameter space will help us interpret results from IceCube.
Questions
