ar X iv : a st ro - p h / 01 11 45 6 v 1 2 3 N ov 2 00 1 Direct Detection of CDM Substructure

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 / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes

ar X iv : a st ro - p h / 01 11 45 6 v 2 2 A pr 2 00 2 Direct Detection of CDM Substructure

We devise a method to measure the abundance of satellite halos in gravitational lens galaxies, and apply our method to a sample of 7 lens systems. After using Monte Carlo simulations to verify the method, we find that substructure comprises f sat = 0.02 (median, 0.006 < f sat < 0.07 at 90% confidence) of the mass of typical lens galaxies, in excellent agreement with predictions of CDM simulatio...

ar X iv : a st ro - p h / 02 11 45 7 v 1 2 0 N ov 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.

ar X iv : a st ro - p h / 06 11 54 4 v 1 1 6 N ov 2 00 6 Discovery of a nearby twin of SN 1987 A ’ s nebula around the