Cluster mass functions in the quintessential universe

摘要: We use N-body simulations to measure mass functions in flat cosmological models with quintessence characterized by constant w = -1, -2/3 and -1/2. The results are compared the predictions of formula proposed Jenkins et al. at different redshifts, terms friends-of-friends (FOF) masses as well Abell appropriate for direct comparison observations. reproduces quite simulated haloes quintessence. cluster function data a number redshifts from Carlberg constrain Ω 0 , σ 8 w. best fit is obtained limit → 0, but none values considered range -1 ≤ < can actually be excluded. However, adopted value significantly affects constraints -σ plane. Taking into account dependence on we find 0.32 ± 0.15 0.85 +0.38 -0.12 (68 per cent confidence level). Because less negative push regions toward higher lower as, conclude that relaxing assumption typically made such comparisons, may resolve discrepancy between recent (yielding rather low high ) most other estimates. fact preferred may, however, also point towards some unknown systematics or model being inadequate.