Publication : t14/243

Anomalous coupling of the small-scale structures to the large-scale gravitational growth

Taruya A. (Yukawa Institute for Theoretical Physics Kyoto University (YITP), Kyoto 606-8502, JAPAN)
Bernardeau F. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Nishimichi Takahiro (IAP, 98 bis, boulevard Arago, 75014 Paris, France)
We present detailed simulation measurement of the nonlinear response of the power spectrum to small variations in the linear counterpart in the context of cosmological large-scale structure formation. While the mode-coupling structure can be explained to a large extent with the standard perturbation theory, we show that the coupling of the short-wave modes are however significantly damped away making them contributing only weakly to the growth of long-wave modes. This is the first time such an effect is measured. It is of crucial importance for the use of large-scale cosmological data as probes of fundamental cosmological or physical parameters.
Année de publication : 2014
Preprint : arXiv:1411.2970
Langue : Anglais

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