A one-parameter formula for testing slow-roll dark energy: observational prospects

Understand

Numerous upcoming observations, such as WFIRST, BOSS, BigBOSS, LSST, Euclid, and Planck, will constrain dark energy (DE)'s equation of state with great precision.

• They may well find the ratio of pressure to energy density, $w$, is -1, meaning DE is equivalent to a cosmological constant.
• However, many time-varying DE models have also been proposed.
• A single parametrization to test a broad class of them and that is itself motivated by a physical picture is therefore desirable.