DEEP LENS SURVEY Long term dual hemisphere campaign Multiband very deep photometry 3-D mass tomography in 28 sq deg Transient detections available in real time on the web: http://dls.bell-labs.com

BVRz to 26 mag over 28 sq.deg

Gravitational Lensing must resolve

Weak Gravitational Lensing Uses distortion of background galaxies to map foreground mass concentrations. Complements SN and CMB measurements

Galaxy size vs redshift

Correcting PSF e=0.1 <0.01

N-body CDM Simulation

Real Weak Lens Mass Map

Weak lensing “cosmic shear”

T. Tyson 2001

Color-redshift

Galaxy Distribution for pre-LSST 28 square degree survey

3-D Mass Tomography

Cluster detected in weak lensing shear map

Lens Redshift Likelihood Wittman, etal 2001

Current survey: some dark clusters 40 arcmin Mass maps Optical images

Growth rate shear statistic [sources at z=1]

Opening the Optical Time Window Orphan afterglows Stellar variability Caustic crossings Hi-z AGN/QSO The Unknown

Frame Subtraction is at Poisson Limit

Leads to non-traditional search algorithms Alard-Lupton Algorithm, implemented by G. Bernstein and A. Becker: ~120 CPU-sec for 2K x 2K align/convolve/subtract Leads to non-traditional search algorithms

Transients from the Deep Lens Survey http://dls.bell-labs.com

http://lssto.org