Zhe Cahng, Ming-Hua Li, Sai Wang
Astronomical observations showed that there exists a bulk flow with peculiar velocities in the universe, which contradicts with the (\Lambda)CDM model. The bulk flow reveals that the observational universe is anisotropic at large scales. In this paper, we propose a "wind" scenario to the bulk flow. Under the influence of the "wind", the spacetime metric could become a Finsler structure. By resolving the null geodesic equation, we obtain the modified luminosity distance, which has a dipolar form at the leading order. Thus, the "wind" describes well the bulk flow. In addition, we perform a least-(\chi^2) fit to the data of type Ia supernovae (SNe Ia) in the Union2.1 compilation. The peculiar velocity of the bulk flow has an upper limit (v_{bulk}\lesssim 4000 \rm{km/s}), which is compatible with all the existing observational values.
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http://arxiv.org/abs/1303.1596
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