Joint Efficient Dark-energy Investigation (JEDI)
JEDI (Joint Efficient Dark-energy Investigation)
is a candidate implementation of
the NASA-DOE Joint Dark Energy Mission (JDEM).
The cause for the observed acceleration of cosmic expansion is generally
referred to as "dark energy". Dark energy could be an unknown
energy component of the universe with negative pressure, or the manifestation
of a modification of Einstein's theory of general relativity.
Solving the mystery of the nature of dark energy
is the most important problem in cosmology today.
JEDI will illuminate the nature of dark energy by answering these questions:
(1) Is dark energy a cosmological constant?
(2) Does Einstein's general relativity describe our universe?
JEDI is a 2m class space telescope capable of simultaneous
wide-field imaging and multiple object spectroscopy with a
field of view of 1 square degree.
JEDI will provide three independent ways to probe dark energy:
distance-redshift relations of type Ia supernovae (SNe Ia),
baryonic oscillations from a galaxy redshift survey,
and weak lensing cross-correlation cosmography.
JEDI is the natural extrapolation to a space platform of
the concept of an
ultra-deep supernova survey proposed by Wang (1998).