 |
Evidence for the existence of some form of dark energy -- a smooth
component
that causes the accelerated expansion of the universe and contributes
about 70%
of the total energy density -- is by now very solid. Despite thousands
of
published papers on the topic, however, very little progress has been
made in
understanding its nature and the underlying physical mechanism. In
this talk I
describe the prospects of several methods to measure the macroscopic
properties
of dark energy within the next decade. In addition to type Ia
supernovae, these
include weak and strong gravitational lensing, number counts of
clusters of
galaxies, and cosmic microwave background anisotropies. I particularly
concentrate on weak gravitational lensing, describing the recent
progress and
challenges in controlling the systematic errors. Considering the
expected
sensitivity of space-based experiments that will perform these
measurements, I
comment on the prospects for the overall advancement of our
understanding of
dark energy.
22 04 2005, ISCAP Seminar Room Pupin 908, 2:00 pm
|