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• W1984673583 abstract "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 $kensuremath{le}1htext{ }text{ }{mathrm{Mpc}}^{ensuremath{-}1}$, and on small scales, better than 10% for $kensuremath{le}10htext{ }text{ }{mathrm{Mpc}}^{ensuremath{-}1}$, at $zensuremath{ge}0.35$, which improves over previous methods." @default.
• W1984673583 created "2016-06-24" @default.
• W1984673583 creator A5002865396 @default.
• W1984673583 creator A5053901852 @default.
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• W1984673583 date "2013-04-23" @default.
• W1984673583 modified "2023-09-30" @default.
• W1984673583 title "Matter power spectrum from a Lagrangian-space regularization of perturbation theory" @default.
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• W1984673583 doi "https://doi.org/10.1103/physrevd.87.083522" @default.
• W1984673583 hasPublicationYear "2013" @default.
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