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- W2005013882 abstract "It has been proposed that the cosmological constant $Lambda$ might be measured from geometric effects on large-scale structure. A positive vacuum density leads to correlation-function contours which are squashed in the radial direction when calculated assuming a matter-dominated model. We show that this effect will be somewhat harder to detect than previous calculations have suggested: the squashing factor is likely to be $<1.3$, given realistic constraints on the matter contribution to $Omega$. Moreover, the geometrical distortion risks being confused with the redshift-space distortions caused by the peculiar velocities associated with the growth of galaxy clustering. These depend on the density and bias parameters via the combination $betaequiv Omega^{0.6}/b$, and we show that the main practical effect of a geometrical flattening factor $F$ is to simulate gravitational instability with $beta_{rm eff}simeq 0.5(F-1)$. Nevertheless, with datasets of sufficient size it is possible to distinguish the two effects; we discuss in detail how this should be done. New-generation redshift surveys of galaxies and quasars are potentially capable of detecting a non-zero vacuum density, if it exists at a cosmologically interesting level." @default.
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- W2005013882 date "1996-10-01" @default.
- W2005013882 modified "2023-10-13" @default.
- W2005013882 title "Measuring the cosmological constant with redshift surveys" @default.
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- W2005013882 doi "https://doi.org/10.1093/mnras/282.3.877" @default.
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