Searching for Supersymmetric Dark Matter - The Directional Rate and the Modulation Effect Due to Caustic Rings

Abstract

The detection of the theoretically expected dark matter is central to particle physics and cosmology. Current fashionable supersymmetric models provide a natural dark matter candidate which is the lightest supersymmetric particle (LSP). The allowed parameter space of such models combined with fairly well understood physics (quark substructure of the nucleon and nuclear structure) permit the evaluation of the event rate for LSP-nucleus elastic scattering. The thus obtained event rates, which sensitively depend on the allowed parameter space parameters, are usually very low or even undetectable. So, for background reduction, one would like to exploit two nice features of the reaction, the directional rate, which depends on the sun's direction of motion and the modulation effect, i.e. the dependence of the event rate on the earth's annual motion. In the present paper we study these phenomena in a specific class of non isothermal models, which take into account the late in-fall of dark matter into our galaxy, producing flows of caustic rings. We find that the modulation effect arising from such models is smaller than that found previously with isothermal symmetric velocity distributions and much smaller compared to that obtained using a realistic asymmetric distribution with enhanced dispersion in the galactocentric direction.

31 LATEX pages, 2 tables and 1 figure included. Accepted for publication in Physical Review D

Cited by in corpus (35)

• WIMP Annual Modulation with Opposite Phase in Late-Infall Halo Models
• Diurnal and Annual Modulation of Cold Dark Matter Signals
• Effect of halo modelling on WIMP exclusion limits
• The Caustic Ring Model of the Milky Way Halo
• Astrophysical uncertainties on the local dark matter distribution and direct detection experiments
• Effect of realistic astrophysical inputs on the phase and shape of the WIMP annual modulation signal
• Evidence for Ring Caustics in the Milky Way
• Dependence of direct detection signals on the WIMP velocity distribution
• Determining the WIMP mass using direct detection experiments
• The impact of going beyond the Maxwell distribution in direct dark matter detection rates
• Can Solar Neutrinos be a Serious Background in Direct Dark Matter Searches?
• Theoretical Directional and Modulated Rates for Direct SUSY Dark Matter Detection
• Solar Wakes of Dark Matter Flows
• Robustness of Discrete Flows and Caustics in Cold Dark Matter Cosmology
• On The Direct Detection of Dark Matter- Exploring all the signatures of the neutralino-nucleus interaction
• Does the Second Caustic Ring of Dark Matter Cause the Monoceros Ring of Stars ?
• Direct Dark Matter Detection - A spin 3/2 WIMP candidate
• Direct dark matter searches - Test of the Big Bounce Cosmology
• Direct Detection Rates of Dark Matter Coupled to Dark Energy
• Direct Wimp Detection in Directional Experiments
• A further look at particle annihilation in dark matter caustics
• Direct Dark Matter Detection with Velocity Distribution in the Eddington approach
• Axionic dark matter signatures in various halo models
• A scheme for the extraction of WIMP-nucleon scattering cross sections from total event rates
• Dark Matter in 3D
• Debris Flows in Direct Dark Matter Searches-The modulation effect
• WIMP annihilation in caustics
• SUSY Dark Matter in the Universe- Theoretical Direct Detection Rates
• Searching for Dark Matter- Theoretical Rates and Exclusion Plots due to the Spin
• Caustics, cold flows, and annual modulation
• Halo Density Profiles Consistent with Asymmetric M-B Velocity Distributions-Implications on Direct Dark Matter Searches
• Predicted modulated differential rates for direct WIMP searches at low energy transfers
• The asymmetry and the diurnal variation in axionic dark matter searches
• New Velocity Distribution in the Context of the Eddington Theory
• DAMA and the self similar infall halo model