Observational Probes of Dark Energy
  The cause for the observed acceleration in the expansion of the universe is
unknown, and referred to as "dark energy" for convenience. Dark energy could be
an unknown energy component, or a modification of Einstein's general
relativity. This dictates the measurements that are optimal in unveiling the
nature of dark energy: the cosmic expansion history, and the growth history of
cosmic large scale structure. I will examine Type Ia supernovae and galaxy
clustering as dark energy probes, and discuss recent results and future
prospects.
