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Abstract: The properties of the galaxy distribution at large scales are usually studiedusing statistics which are assumed to be self-averaging inside a given sample.We present a new analysis able to quantitatively map galaxy large scalestructures while testing for the stability of average statistical quantities indifferent sample regions. We find that the newest samples of the Sloan DigitalSky Survey provide unambiguous evidence that galaxy structures correspond tolarge amplitude density fluctuations at all scales limited only by samplesizes. The two-point correlations properties are self-averaging up toapproximately 30 Mpc-h and are characterized by a fractal dimension D=2.1 +-0.1. Then at all larger scales probed density fluctuations are too large inamplitude and too extended in space to be self-averaging inside the consideredvolumes. These inhomogeneities are compatible with a continuation of fractalcorrelations but incompatible with: i a homogeneity scale smaller than 100Mpc-h, ii predictions of standard theoretical models, iii mock galaxycatalogs generated from cosmological Nbody simuations.



Autor: Francesco Sylos Labini, Nikolay L. Vasilyev, Luciano Pietronero, Yurij V. Baryshev

Fuente: https://arxiv.org/







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