The KABKE dark flow.

The Kabke Dark Flow.

A copy of our ApJ Lett can be downloaded here

The main result by KABKE (2008) is displayed in the figure. The solid line is the Lambda-CDM prediction, the red shade is the 1sigma cosmic variance uncertainty. Diammonds represent our measurements with 1sigma errors. The horizontal bar joints the mean and median redshifts of our sample.

Our result show that the Lambda-CDM model can not account for the large scale velocity flows measured by us. If the motion is local must be generated by a large mass concentration or a void of about 1Gyr. If the motion extends all the way across the horizon, then it will be an indication that superhorizon sized perturbations dominate the dynamics of the local Universe.
Our measurement was independently confirmed by Watkins, Feldman and Hudson [arXiv: 0809.4041] albeit at a smaller scale and with smaller amplitude, and by Lavaux, Tully, Mohayee and Colombi [arXiv: 0810.3658].

Several interpretations have been proposed:

An intrisic gradient in the metric, proposed by Grishuk and Zeldovich. In this context, was suggested by M Turner in 1991.
Is the 'smoking gun' of the string landscape of quantum cosmology. Proposed by L. Mersini-Houghton and Holman [arXiv: 0810.5388]
It is the prove that the Dark Matter and Dark Energy rest frames are not the same. Suggested by J. Beltran and A. Maroto [arXiv: 0811.3606]
The void solution would correspond to the Lemaitre-Tolman-Bondi solution, See J. Garcia-Bellido and Haugboelle [arXiv: 0810.4939]

Fernando Atrio Barandela
Departamento de Fisica Fundamental
Universidad de Salamanca
37008 Salamanca, Spain

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