Journal
PHYSICAL REVIEW D
Volume 87, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.083522
Keywords
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Funding
- Ministere des Affaires Etrangeres et Europeennes in France
- Japan Society for the Promotion of Science (JSPS)
- French Agence Nationale de la Recherche [ANR-12-BS05-0002]
- JSPS [24540257]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- [PD: 22-181]
- Grants-in-Aid for Scientific Research [24540257] Funding Source: KAKEN
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We present a new approach to computing the matter density power spectrum, from large linear scales to small, highly nonlinear scales. Instead of explicitly computing a partial series of high-order diagrams, as in perturbative resummation schemes, we embed the standard perturbation theory within a realistic nonlinear Lagrangian-space ansatz. We also point out that an adhesion-like regularization of the shell-crossing regime is more realistic than a Zel'dovich-like behavior, where particles freely escape to infinity. This provides a cosmic web power spectrum with good small-scale properties that provide a good matching with a halo model on mildly nonlinear scales. We obtain a good agreement with numerical simulations on large scales, better than 3% for k <= 1h Mpc(-1), and on small scales, better than 10% for k <= 10h Mpc(-1), at z >= 0.35, which improves over previous methods. DOI: 10.1103/PhysRevD.87.083522
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