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  Measuring the tidal response of structure formation: anisotropic separate universe simulations using treepm

Stücker, J., Schmidt, A. S., White, S. D. M., Schmidt, F., & Hahn, O. (2021). Measuring the tidal response of structure formation: anisotropic separate universe simulations using treepm. Monthly Notices of the Royal Astronomical Society, 503(1), 1473-1489. doi:10.1093/mnras/stab473.

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Stücker, Jens, Author
Schmidt, Andreas S.1, Author              
White, Simon D. M.2, Author              
Schmidt, Fabian3, Author              
Hahn, Oliver, Author
Affiliations:
1Cosmology, MPI for Astrophysics, Max Planck Society, ou_159876              
2Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
3High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: We present anisotropic ‘separate universe’ simulations that modify the N-body code gadget4 in order to represent a large-scale tidal field through an anisotropic expansion factor. These simulations are used to measure the linear, quasi-linear, and non-linear response of the matter power spectrum to a spatially uniform trace-free tidal field up to wavenumber k=7hMpc−1⁠. Together with the response to a large-scale overdensity measured in previous work, this completely describes the non-linear matter bispectrum in the squeezed limit. We find that the response amplitude does not approach zero on small scales in physical coordinates, but rather a constant value at z = 0, RK ≈ 0.5 for k≥3hMpc−1 up to the scale where we consider our simulations reliable, k≤7hMpc−1⁠. This shows that even the inner regions of haloes are affected by the large-scale tidal field. We also measure directly the alignment of halo shapes with the tidal field, finding a clear signal that increases with halo mass.

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 Dates: 2021-02-18
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab473
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 503 (1) Sequence Number: - Start / End Page: 1473 - 1489 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150