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The nature of dark energy remains a profound mystery 20 years after thediscovery of cosmic acceleration. A very high number density galaxy redshiftsurvey over a wide area (HD GRS Wide) spanning the redshift range of 0.5<z<4using the same tracer, carried out using massively parallel wide fieldmulti-object slit spectroscopy from space, will provide definitive dark energymeasurements with minimal observational systematics by design. The HD GRS Widewill illuminate the nature of dark energy, and lead to revolutionary advancesin particle physics and cosmology. It will also trace the cosmic web of darkmatter and provide key insight into large-scale structure in the Universe. Therequired observational facility can be established as part of the probeportfolio by NASA within the next decade.

Illuminating the dark universe with a very high density galaxy redshift survey over a wide area