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    Paper   IPM / Astronomy / 13652
       School of Astronomy
      Title: Fingerprints of Anomalous Primordial Universe on the Abundance of Large Scale Structures
      Author(s):
    1 . S. Baghram
    2 . A. Abolhasani
    3 . H. Firouzjahi
    4 . M.H. Namjoo
      Status: Published
      Journal: JCAP
      Vol.: 2014
      Year: 2014
      Pages: 16
      Supported by: IPM
      Abstract:
    We study the predictions of anomalous inflationary models on the abundance of structures in large scale structure observations. The anomalous features encoded in primordial curvature perturbation power spectrum are (a): localized feature in momentum space, (b): hemispherical asymmetry and (c): statistical anisotropies. We present a model-independent expression relating the number density of structures to the changes in the matter density variance. Models with localized feature can alleviate the tension between observations and numerical simulations of cold dark matter structures on galactic scales as a possible solution to the missing satellite problem. In models with hemispherical asymmetry we show that the abundance of structures becomes asymmetric depending on the direction of observation to sky. In addition, we study the effects of scale-dependent dipole amplitude on the abundance of structures and, using the quasars data, we find the upper bound nA<0.6 for the spectral index of the dipole asymmetry. In all cases there is a critical mass scale Mc in which for M Mc) the enhancement in variance induced from anomalous feature decreases (increases) the abundance of dark matter structures in Universe.

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