The goal of better understanding the origins of the Universe requires probing this epoch of Inflation directly. The most promising probe of Inflation is the unique signature that the Gravitational Wave Background (GWB) imprints on the polarization of the CMB.
The amplitude of this signature depends on the energy-scale of Inflation. If the energy scale is typical of Grand Unification Theory (GUT, 10^16 GeV), the signature may be detectable.
Detection will require only modest angular resolution (~ 1 deg.), but will require long integration (~3 years) on a restricted (~3%) and contiguous patch of sky.