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Measurements of the distances to type Ia supernovae have produced strong evidence that the expansion of the Universe is accelerating, implying the existence of a nearly uniform component of dark energy with negative pressure. We show that constraints to this mysterious component based upon large-scale structure nicely complement the SN Ia data, and that together they require ₗ0ex{0ex}=0ex{0ex}ₗ/₂ₑ₈ₓ (0. 6, 0. 7) and w{0ex{0ex}=0ex{0ex}p}ₗ/ₗ<-0. 6 (95% C. L. ), for the favored flat Universe. Other cosmological data support this conclusion. The simplest explanation, a cosmological constant, is consistent with this, while some of the other possibilities are not.
Perlmutter et al. (Mon,) studied this question.
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