Indirect detection of a subdominant density component of cold dark matter

Abstract

We examine the detectability through indirect means of weakly interacting dark matter candidates that may constitute not all but only a subdominant component of galactic cold dark matter. We show that the possibility of indirect detection of neutralinos from their annihilations in the Earth and Sun is not severely hampered by decreasing neutralino relic density. Upward-going muon fluxes in underground detectors from neutralino annihilations in the Sun can remain above the threshold of detectability of 10 muons/km^2/yr for neutralinos composing 1% or more of the halo dark matter. Similarly, signals from neutralino annihilations in the Earth can also remain high for neutralino densities of 1% of the halo and actually would only be observable close to this low density for neutralinos lighter than 150 GeV. We also show that there are many models which simultaneously have high direct and indirect detection rates making some model discrimination possible if a signal is seen in any of the current dark matter searches.

15 pages plus 17 figures

References in corpus (2)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.7 ppm
• Improved Exclusion Limits from the EDELWEISS WIMP Search

Cited by in corpus (17)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Dark matter searches with Cherenkov telescopes: nearby dwarf galaxies or local galaxy clusters?
• Direct Detection of Dark Matter in Supersymmetric Models
• Higgsino Dark Matter in a SUGRA Model with Nonuniversal Gaugino Masses
• A minimal model for two-component dark matter
• Multi-Component Dark Matter in a Non-Abelian Dark Sector
• A tale of dark matter capture, sub-dominant WIMPs, and neutrino observatories
• Two Component Feebly Interacting Massive Particle (FIMP) Dark Matter
• An Ultimate Target for Dark Matter Searches
• A Minimal Model For Two-Component FIMP Dark Matter: A Basic Search
• Primordial Gravitational Waves and Inflation: CMB and Direct Detection With Space-Based Laser Interferometers
• MiXDM: Cosmic Ray Signals from Multiple States of Dark Matter
• Introduction to Non-Baryonic Dark Matter
• What is the Cosmological Significance of a Discovery of Wimps at Colliders or in Direct Experiments?
• Experimental signatures of non-standard pre-BBN cosmologies
• Determining the Actual Local Density of Dark Matter Particles
• Wimp/Neutralino Direct Detection