The measurement of the speed of sound of quintessence, a time-varying energy component describing the accelerated expansion of the universe, was discussed. It was shown that if the quintessence density was at least 1% of the critical density at the surface of last scattering, the cosmic microwave background (CMB) anisotropy distinguished between models whose sound was near the speed of light versus near zero. The results suggested that CMB could be useful in distinguishing competing candidates for dark energy.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review Letters|
|State||Published - Mar 25 2002|
ASJC Scopus subject areas
- Physics and Astronomy(all)