Cadiou, C;
Pichon, C;
Codis, S;
Musso, M;
Pogosyan, D;
Dubois, Y;
Cardoso, J-F;
(2020)
When do cosmic peaks, filaments or walls merge? A theory of critical events in a multi-scale landscape.
Monthly Notices of the Royal Astronomical Society
, 496
(4)
pp. 4787-4821.
10.1093/mnras/staa1853.
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Abstract
The merging rate of cosmic structures is computed, relying on the Ansatz that they can be predicted in the initial linear density field from the coalescence of critical points with increasing smoothing scale, used here as a proxy for cosmic time. Beyond the mergers of peaks with saddle points (a proxy for halo mergers), we consider the coalescence and nucleation of all sets of critical points, including wall-saddle to filament-saddle and wall-saddle to minima (a proxy for filament and void mergers respectively), as they impact the geometry of galactic infall, and in particular filament disconnection. Analytical predictions of the one-point statistics are validated against multiscale measurements in 2D and 3D realisations of Gaussian random fields (the corresponding code being available upon request) and compared qualitatively to cosmological $N$-body simulations at early times ($z\geq 10$) and large scales ($\geq 5\, \mathrm{Mpc}/h$). The rate of filament coalescence is compared to the merger rate of haloes and the two-point clustering of these events is computed, along with their cross-correlations with critical points. These correlations are qualitatively consistent with the preservation of the connectivity of dark matter haloes, and the impact of the large scale structures on assembly bias. The destruction rate of haloes and voids as a function of mass and redshift is quantified down to $z=0$ for a $\Lambda$CDM cosmology. The one-point statistics in higher dimensions are also presented, together with consistency relations between critical point and critical event counts.
| Type: | Article |
|---|---|
| Title: | When do cosmic peaks, filaments or walls merge? A theory of critical events in a multi-scale landscape |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa1853 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/staa1853 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | galaxies: evolution – galaxies: formation – galaxies: kinematics and dynamics – cosmology: theory – large-scale structure of Universe. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10106083 |
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