Quintessential isocurvature in separate universe simulations

Jamieson, Drew; Loverde, Marilena

doi:10.1103/physrevd.100.023516

Title: Quintessential isocurvature in separate universe simulations

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/physrevd.100.023516· OSTI ID:1612759

^[1]; Loverde, Marilena ^[1]

Stony Brook Univ., NY (United States)

In a universe with quintessence isocurvature, or perturbations in dark energy that are independent from the usual curvature perturbations, structure formation is changed qualitatively. The existence of two independent fields, curvature and isocurvature, causes the growth rate of matter perturbations to depend on their initial conditions. The quintessence perturbations cause their growth to depend on scale. We perform the first separate universe simulations for this cosmology. We demonstrate that the power spectrum response and the halo bias depend on scale and initial conditions and that the presence of the isocurvature mode changes the mapping from these quantities to the halo auto- and cross-power spectra, and the squeezed-limit bispectrum. We compare the bias to several models, finding reasonable agreement with both a power-spectrum-response model with one free parameter and a model that fits two independent bias parameters for curvature and isocurvature sourced fluctuations. We also verify that simulation responses to pure isocurvature and pure curvature modes can be linearly combined to reproduce responses with different ratios of isocurvature and curvature. Furthermore, this allows our results to be used to predict the halo power spectrum and stochasticity with arbitrary large-scale curvature and isocurvature power spectra. In an Appendix, we study the generation of quintessence isocurvature during inflation and show that a modified kinetic term is typically required to produce observable isocurvature modes in a field with w_Q ≈ –1.

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Research Organization:: State Univ. of New York (SUNY), Albany, NY (United States); State Univ. of New York (SUNY), Stony Brook, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0017848

OSTI ID:: 1612759

Alternate ID(s):: OSTI ID: 1542531; OSTI ID: 1984853

Journal Information:: Physical Review D, Vol. 100, Issue 2; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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