Evolving ultralight scalars into non-linearity with Lagrangian perturbation theory - INSPIRE

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Evolving ultralight scalars into non-linearity with Lagrangian perturbation theory

Apr 17, 2020

14 pages

Published in:

Mon.Not.Roy.Astron.Soc. 504 (2021) 2, 2391-2404

Published: Apr 26, 2021

e-Print:

2004.08482 [astro-ph.CO]

DOI:

10.1093/mnras/stab601

View in:

ADS Abstract Service

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Abstract: (Oxford University Press)

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.

Note:

Submitted to MNRAS, comments welcome

galaxies: haloes
dark matter
large-scale structure of Universe

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