Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 393, Issue 1, Pages L31-L35Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2008.00592.x
Keywords
methods: numerical; large-scale structure of Universe
Categories
Funding
- ARC [DP0665574]
- Director, Office of Science, Office of High Energy Physics, of the US Department of Energy [DE-AC02-05CH11231]
Ask authors/readers for more resources
We examine the linear density contrast at collapse time, delta(c), for large-scale structure in dynamical dark energy cosmologies, including models with early dark energy. Contrary to previous results, we find that as long as dark energy is homogeneous on small scales, delta(c) is insensitive to dark energy properties for parameter values fitting current data, including the case of early dark energy. This is significant since using the correct delta(c) is crucial for accurate Press-Schechter prediction of the halo mass function. Previous results have found an apparent failing of the extended Press-Schechter approach (Sheth-Tormen) for early dark energy. Our calculations demonstrate that with the correct delta(c), the accuracy of this approach is restored. We discuss the significance of this result for the halo mass function and examine what dark energy physics would be needed to cause significant change in delta(c), and the observational signatures this would leave.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available