Ricardo A. Flores

OBSERVATIONAL AND THEORETICAL CONSTRAINTS ON SINGULAR DARK MATTER HALOS

The distribution of dark matter around galactic or cluster halos has usually been assumed to be approximately isothermal with a non-zero core radius, which is expected to be of the order of the size of the visible matter distribution. Recently, the possibility has been raised that dark matter halos might be singular in the sense that the dark matter density

Elastic supersymmetric relic - nucleus scattering revisited

\rho

Rotation curves from baryonic infall : dependence on disk-to-halo ratio, initial angular momentum, and core radius, and comparison with data

could increase monotonically with radius

Breaking the Disk/Halo Degeneracy with Gravitational Lensing

r

Arc Statistics in Clusters: Galaxy Contribution

down to a very small distance from the center of galaxies or clusters. Such central cusps in the dark matter density could lead to a high flux of gamma rays from WIMP dark matter annihilation. Here we analyze two possibilities that have been discussed in the literature,

Inclination Effects in Spiral Galaxy Gravitational Lensing

\rho \propto r^{-n}

Prospects for neutralino detection with a 73Ge+76Ge detector

with

A PREDICTION OF OBSERVABLE ROTATION IN THE INTRACLUSTER MEDIUM OF ABELL 3266

n \approx 1\ {\rm or}\ 2

Implications of LEP on laboratory searches for dark matter neutralinos

, and point out that such density profiles are excluded by gravitional lensing analyses on cluster scales and by the rotation curves of gas-rich, halo-dominated dwarf spirals on small scales. We also point out that if spiral galaxies form by gas infall inside dark matter halos, as they are expected to do in any hierarchical clustering model, such profiles almost always lead to falling rotation curves after infall, contrary to observations.

Implications of the strange spin of the nucleon for the neutron electric dipole moment in supersymmetric theories

Abstract We survey the elastic scattering rates of neutralinos on many nuclei, incorporating LEP constraints and choosing model parameters that give a critical density of the lightest neutralino, using the odd-group model to estimate nuclear matrix elements and incorporating a simple model for the momentum dependence of the elastic spin and mass form factors. We find that the rates for elastic scattering on 19 F can be estimated reliably and are reasonably large for a relic mass, M x , in the range M x ≈20–60 GeV. We present calculations of the elastic neutralino - 19 F scattering rates in regions of parameter space consistent with LEP and other laboratory experiments.