Weak Lensing in the Dark Energy Survey
Daniel Gruen
Stanford University



The Dark Energy Survey has combined analyses of galaxy clustering and weak gravitational lensing two-point correlation functions in its first year (Y1) of observations. This combination of measurements provides information on the amplitude of density fluctuations (S8=0.794+0.029-0.027) and the dark energy equation of state (w=-0.80+0.20-0.22) that is competitive and consistent with Planck CMB data. When joint with probes of cosmic geometry, it yields the best measurement of these parameters to date. I will review these results and the technical advances that facilitated them. In addition, I will also present work that provides a DES lensing view of higher than second moments of the matter density field.