ar X iv : a st ro - p h / 02 12 27 4 v 1 1 1 D ec 2 00 2 CDM Substructure in Gravitational Lenses : Tests and Results

ar X iv : a st ro - p h / 01 12 35 0 v 1 1 4 D ec 2 00 1 Lens Galaxies vs . CDM

By directly probing mass distributions, gravitational lensing offers several new tests of the CDM paradigm. Lens statistics place upper limits on the dark matter content of elliptical galaxies. Galaxies built from CDM mass distributions are too concentrated to satisfy these limits, so lensing extends the “concentration problem” in CDM to elliptical galaxies. The central densities of the model g...

ar X iv : a st ro - p h / 01 11 40 1 v 1 2 0 N ov 2 00 1 Detection of CDM Substructure

The properties of multiple image gravitational lenses require a fractional surface mass density in satellites of fsat = 0.02 (0.006 < ∼ fsat < ∼ 0.07 at 90% confidence) that is consistent with the expectations for CDM. The characteristic satellite mass scale, 10 6-10 9 M⊙, is also consistent with the expectations for CDM. The agreement between the observed and expected density of CDM substructu...

ar X iv : a st ro - p h / 06 12 37 8 v 1 1 4 D ec 2 00 6 Magnetic fields , strings and cosmology

ar X iv : a st ro - p h / 03 02 03 6 v 1 4 F eb 2 00 3 Tests for Substructure in Gravitational Lenses

The flux anomalies in four-image gravitational lenses can be interpreted as evidence for the dark matter substructure predicted by cold dark matter (CDM) halo models. In principle, these flux anomalies could arise from alternate sources such as absorption, scattering or scintillation by the interstellar medium (ISM) of the lens galaxy, problems in the ellipsoidal macro models used to fit lens s...

ar X iv : a st ro - p h / 02 11 45 7 v 2 1 0 D ec 2 00 2 Time variation of fundamental constants : two phenomenological models

Time variation of fundamental constants, a strong signal of new physics, is analyzed comparing extant data with two phenomenological models. Results are discussed.