Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-06
Astrophys.J.696:L10-L12,2009
Astronomy and Astrophysics
Astrophysics
ApJL in press, growth factor corrected, parameter degeneracy calculated
Scientific paper
10.1088/0004-637X/696/1/L10
Our universe is observed to be accelerating due to the dominant dark energy with negative pressure. The dark energy equation of state (w) holds a key to understanding the ultimate fate of the universe. The cosmic voids behave like bubbles in the universe so that their shapes must be quite sensitive to the background cosmology. Assuming a flat universe and using the priors on the matter density parameter (Omega_m) and the dimensionless Hubble parameter (h), we demonstrate analytically that the ellipticity evolution of cosmic voids may be a sensitive probe of the dark energy equation of state. We also discuss the parameter degeneracy between w and Omega_m.
Lee Jounghun
Park Daeseong
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