Pontzen, A;
Slosar, A;
Roth, N;
Peiris, HV;
(2016)
Inverted initial conditions: Exploring the growth of cosmic structure and voids.
Physical Review D
, 93
(10)
, Article 103519. 10.1103/PhysRevD.93.103519.
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Abstract
We introduce and explore "paired" cosmological simulations. A pair consists of an A and B simulation with initial conditions related by the inversion δAðx; tinitialÞ ¼ −δBðx; tinitialÞ (underdensities substituted for overdensities and vice versa). We argue that the technique is valuable for improving our understanding of cosmic structure formation. The A and B fields are by definition equally likely draws from ΛCDM initial conditions, and in the linear regime evolve identically up to the overall sign. As nonlinear evolution takes hold, a region that collapses to form a halo in simulation A will tend to expand to create a void in simulation B. Applications include (i) contrasting the growth of A-halos and B-voids to test excursion-set theories of structure formation, (ii) cross-correlating the density field of the A and B universes as a novel test for perturbation theory, and (iii) canceling error terms by averaging power spectra between the two boxes. Generalizations of the method to more elaborate field transformations are suggested.
Type: | Article |
---|---|
Title: | Inverted initial conditions: Exploring the growth of cosmic structure and voids |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1103/PhysRevD.93.103519 |
Publisher version: | http://dx.doi.org/10.1103/PhysRevD.93.103519 |
Language: | English |
Additional information: | Copyright © 2016 American Physical Society. The published version of record is available at http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.103519 |
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.ucl.ac.uk/id/eprint/1501110 |
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