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Evolving ultralight scalars into non-linearity with Lagrangian perturbation theory

Many models of high energy physics suggest that the cosmological dark sector consists of not just one, but a spectrum of ultralight scalar particles with logarithmically distributed masses. To study the potential signatures of low concentrations of ultralight axion (also known as fuzzy) dark matter,...

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Bibliographic Details
Main Authors: Laguë, Alex (Author) , Bond, J. Richard (Author) , Hložek, Renée (Author) , Marsh, David J. E. (Author) , Söding, Laurin (Author)
Format: Article (Journal)
Language:English
Published: 04 March 2021
In: Monthly notices of the Royal Astronomical Society
Year: 2021, Volume: 504, Issue: 2, Pages: 2391-2404
ISSN:1365-2966
DOI:10.1093/mnras/stab601
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stab601
Verlag, lizenzpflichtig, Volltext: https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=DynamicDOIArticle&SrcApp=WOS&KeyAID=10.1093%2Fmnras%2Fstab601&DestApp=DOI&SrcAppSID=D2xBIfaKJAXvdgfFtcu&SrcJTitle=MONTHLY+NOTICES+OF+THE+ROYAL+ASTRONOMICAL+SOCIETY&DestDOIRegistrantName=Oxford+University+Press
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Author Notes:Alex Laguë, J. Richard Bond, Renée Hložek, David J. E. Marsh and Laurin Söding
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Summary:Many models of high energy physics suggest that the cosmological dark sector consists of not just one, but a spectrum of ultralight scalar particles with logarithmically distributed masses. To study the potential signatures of low concentrations of ultralight axion (also known as fuzzy) dark matter, we modify Lagrangian perturbation theory (LPT) by distinguishing between trajectories of different dark matter species. We further adapt LPT to include the effects of a quantum potential, which is necessary to generate correct initial conditions for ultralight axion simulations. Based on LPT, our modified scheme is extremely efficient on large scales and it can be extended to an arbitrary number of particle species at very little computational cost. This allows for computation of self-consistent initial conditions in mixed dark matter models. Additionally, we find that shell-crossing is delayed for ultralight particles and that the deformation tensor extracted from LPT can be used to identify the range of redshifts and scales for which the Madelung formalism of fuzzy dark matter can lead to divergences.
Item Description:Gesehen am 11.08.2021
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stab601

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