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Article overview
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Inverted initial conditions: exploring the growth of cosmic structure and voids | | Andrew Pontzen
; Anže Slosar
; Nina Roth
; Hiranya V. Peiris
; | | Date: |
12 Nov 2015 | | Abstract: | We introduce and explore "paired" cosmological simulations. A pair consists
of an A and B simulation with initial conditions related by the inversion
$delta_A(x, t_{initial})=-delta_B(x,t_{initial})$ (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 {Lambda}CDM initial conditions,
and in the linear regime evolve identically up to the overall sign. As
non-linear 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. | | Source: | arXiv, 1511.4090 | | Services: | Forum | Review | PDF | Favorites | |
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