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- W3011447637 abstract "Several observational analyses suggest that matter is spatially structured at a scale of L LSS 130 h 1 Mpc at low redshifts. This peak in the power spectrum provides a standard ruler in comoving space which can be used to compare the local geometry at high and low redshifts, thereby constraining the curvature parameters. It is shown here that this power spectrum peak is present in the observed quasar distribution at z 2: qualitatively, via wedge diagrams which clearly show a void-like structure, and quantitatively, via one-dimensional Fourier analysis of the quasars' tangential distribution. The sample studied here con- tains 812 quasars. The method produces strong constraints (68% confidence limits) on the density parameter 0 and weaker constraints on the cosmological constant 0, which can be expressed by the relation0 =( 0:240:15)+(0:100:08) 0. Independently of 0 (in the range 0 2 (0;1)), the constraint is 0:1 < 0 < 0:45. Constraints if the cosmological constant is zero or if 0 1 0 are 0 =0 :24 +0:05 0:15 and 0 =0 :30 0:15 respectively. The power spectrum peak method is independent from the supernovae Type Ia method by choice of astrophysical ob- ject, by redshift range, and by use of a standard ruler instead of a standard candle. Combination of the two results yields 0 =( 0:30 0: 11) +( 0:57 0:11)(0 0:7); 0:55 < 0 < 0:95; (68% confidence limits) without assuming that 0 1 0. This strongly supports the possibility that the observable universe satisfies a nearly flat, perturbed Friedmann- Lemaalker model, independently of any cos- mic microwave background observations . In other words it has been shown that 0 + 0 =( 1:0 0: 11) +( 1:57 0:11)(0 0:7)." @default.
- W3011447637 created "2020-03-23" @default.
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- W3011447637 date "2000-06-01" @default.
- W3011447637 modified "2023-09-27" @default.
- W3011447637 title "Tangential large scale structure as a standard ruler: curvature parameters from quasars" @default.
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