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Title: Inverted initial conditions: Exploring the growth of cosmic structure and voids

Abstract

We introduce and explore “paired” cosmological simulations. A pair consists of an A and B simulation with initial conditions related by the inversion δA(x,tinitial) = –δB(x,tinitial) (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. Furthermore, generalizations of the method to more elaborate field transformations are suggested.

Authors:
 [1];  [1];  [1];  [2]
  1. Univ. College London, London (United Kingdom)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1295212
Report Number(s):
BNL-112458-2016-JA
Journal ID: ISSN 2470-0010; KA2301020
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Pontzen, Andrew, Roth, Nina, Peiris, Hiranya V., and Slosar, Anze. Inverted initial conditions: Exploring the growth of cosmic structure and voids. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.103519.
Pontzen, Andrew, Roth, Nina, Peiris, Hiranya V., & Slosar, Anze. Inverted initial conditions: Exploring the growth of cosmic structure and voids. United States. doi:10.1103/PhysRevD.93.103519.
Pontzen, Andrew, Roth, Nina, Peiris, Hiranya V., and Slosar, Anze. Wed . "Inverted initial conditions: Exploring the growth of cosmic structure and voids". United States. doi:10.1103/PhysRevD.93.103519. https://www.osti.gov/servlets/purl/1295212.
@article{osti_1295212,
title = {Inverted initial conditions: Exploring the growth of cosmic structure and voids},
author = {Pontzen, Andrew and Roth, Nina and Peiris, Hiranya V. and Slosar, Anze},
abstractNote = {We introduce and explore “paired” cosmological simulations. A pair consists of an A and B simulation with initial conditions related by the inversion δA(x,tinitial) = –δB(x,tinitial) (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. Furthermore, generalizations of the method to more elaborate field transformations are suggested.},
doi = {10.1103/PhysRevD.93.103519},
journal = {Physical Review D},
number = 10,
volume = 93,
place = {United States},
year = {2016},
month = {5}
}

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