Are anomalous cosmic flows a challenge for LCDM?

Vincent Bouillot, Jean Michel Alimi, Yann Rasera, André Füzfa

Research output: Contribution in Book/Catalog/Report/Conference proceedingConference contribution


The dipolar moment of the peculiar velocity field, named bulk flow, is a sensitive cosmological probe: in parallel with the estimation issued from density fluctuations, it can give an indication on the value of cosmological parameters. Recent observations, based independently on composite velocity survey or velocity reconstruction from redshift survey, showed the existence of an anomalously high bulk flow in apparent contradiction with the linear prediction in ΛCDM cosmology. Using numerical simulations, we interpret this observation of consistently large cosmic flows on large scales as a signature of a rare event. Supposing we live in such a configuration and building samples with bulk flow profiles in agreement with the observations, we show that the asymmetric distribution of matter of large scales is responsible for the observed high bulk flow. To confirm the possible origin inΛCDM cosmology of such a bulk flow profile and the agreement with linear theory description, we carefully study the time-dependence of the bulk flow and the distribution of matter.

Original languageEnglish
Title of host publicationSpringer Proceedings in Physics
PublisherSpringer Science and Business Media, LLC
Number of pages7
ISBN (Print)9783319002965
Publication statusPublished - 2014
Event12th International Symposium on Frontiers of Fundamental Physics, FFP 2011 - Udine, Italy
Duration: 21 Nov 201123 Nov 2011


Conference12th International Symposium on Frontiers of Fundamental Physics, FFP 2011


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