Cosmology with the Roman Space Telescope – Synergies with CMB lensing

Wenzl, Lukas; Doux, Cyrille; Heinrich, Chen; Bean, Rachel; Jain, Bhuvnesh; Doré, Olivier; Eifler, Tim; Fang, Xiao

doi:10.1093/mnras/stac790

Title: Cosmology with the Roman Space Telescope – Synergies with CMB lensing

Journal Article · Wed Mar 23 00:00:00 EDT 2022 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stac790· OSTI ID:1863132

;

; Heinrich, Chen; Bean, Rachel; Jain, Bhuvnesh; Doré, Olivier;

;

We explore synergies between the Nancy Grace Roman Space Telescope and CMB lensing data to constrain dark energy and modified gravity scenarios. A simulated likelihood analysis of the galaxy clustering and weak lensing data from the Roman Space Telescope High Latitude Survey combined with CMB lensing data from the Simons Observatory is undertaken, marginalizing over important astrophysical effects and calibration uncertainties. Included in the modelling are the effects of baryons on small-scale clustering, scale-dependent growth suppression by neutrinos, as well as uncertainties in the galaxy clustering biases, in the intrinsic alignment contributions to the lensing signal, in the redshift distributions, and in the galaxy shape calibration. The addition of CMB lensing roughly doubles the dark energy figure-of-merit from Roman photometric survey data alone, varying from a factor of 1.7 to 2.4 improvement depending on the particular Roman survey configuration. Alternatively, the inclusion of CMB lensing information can compensate for uncertainties in the Roman galaxy shape calibration if it falls below the design goals. Furthermore, we report the first forecast of Roman constraints on a model-independent structure growth, parametrized by σ₈(z), and on the Hu-Sawicki f(R) gravity as well as an improved forecast of the phenomenological (Σ₀, μ₀) model. We find that CMB lensing plays a crucial role in constraining σ₈(z) at z > 2, with percent-level constraints forecasted out to z = 4. CMB lensing information does not improve constraints on the f(R) model substantially. It does, however, increase the (Σ₀, μ₀) figure-of-merit by a factor of about 1.5

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Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States); Cornell Univ., Ithaca, NY (United States); Univ. of Arizona, Tucson, AZ (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: SC0007901; SC0020215; SC0011838; 80NSSC18K0695; 12-EUCLID12-0004; ATP 16-ATP16-0084

OSTI ID:: 1863132

Alternate ID(s):: OSTI ID: 1979569

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 512 Journal Issue: 4; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
cosmological parameters
cosmology
theory
large-scale structure of universe

Title: Cosmology with the Roman Space Telescope – Synergies with CMB lensing

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