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 ΩX = ρX/ρcrit∈\(0.6,0.7\) and w = pX/ρX<-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.
Physical Review Letters
- Pub Date:
- July 1999
- High Energy Physics - Phenomenology
- 5 pages Revtex with 2 eps figures, submitted to Phys. Rev. Lett Minor changes to references