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Cosmology with the Roman Space Telescope – Synergies with CMB lensing

Wenzl, Lukas and Doux, Cyrille and Heinrich, Chen and Bean, Rachel and Jain, Bhuvnesh and Doré, Olivier and Eifler, Tim and Fang, Xiao (2022) Cosmology with the Roman Space Telescope – Synergies with CMB lensing. Monthly Notices of the Royal Astronomical Society, 512 (4). pp. 5311-5328. ISSN 0035-8711. doi:10.1093/mnras/stac790.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper ItemCOSMOSIS code ItemHMCODE2020 ItemCode
Wenzl, Lukas0000-0001-5245-2058
Doux, Cyrille0000-0003-4480-0096
Heinrich, Chen0000-0003-0426-1948
Jain, Bhuvnesh0000-0002-8220-3973
Doré, Olivier0000-0002-5009-7563
Eifler, Tim0000-0002-1894-3301
Fang, Xiao0000-0002-5054-9566
Additional Information:© 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2022 March 17. Received 2022 March 15; in original form 2021 December 16. We thank Agnès Ferté for providing the code for solving the modified growth equation. We thank Nicholas Battaglia for helpful discussions about CMB lensing and SO. We thank the other members of the Cosmology with the High Latitude Survey Roman Science Investigation Team for helpful discussions. The work of Lukas Wenzl and Rachel Bean is supported by NASA grant 15-WFIRST15-0008 Cosmology with the High Latitude Survey Roman Science Investigation Team, NASA ATP grant 80NSSC18K0695, NASA ROSES grant 12-EUCLID12-0004, and Department of Energy grant DE-SC0011838. CD and BJ were supported in part by the U.S. Department of Energy grant DE-SC0007901. XF is supported by the Department of Energy grant DE-SC0020215, the NASA ROSES ATP 16-ATP16-0084 grant, and the BCCP Fellowship. Part of this work was done at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Government sponsorship acknowledged. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center. Calculations in this paper use High Performance Computing (HPC) resources supported by the University of Arizona TRIF, UITS, and RDI and maintained by the UA Research Technologies department. DATA AVAILABILITY. COSMOSIS (Zuntz et al. 2015) is available under HMCODE2020 Mead et al. (2021) is available under COSMOLIKE (Eifler et al. 2014; Krause & Eifler 2017, 2020) is shared under reasonable request to the corresponding authors of those papers. The main components of the code underlying this work are available as a repository under Any other data underlying this article will be shared on reasonable request to the corresponding author.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0011838
Department of Energy (DOE)DE-SC0007901
Department of Energy (DOE)DE-SC0020215
Berkeley Center for Cosmological Physics (BCCP)UNSPECIFIED
Subject Keywords:cosmological parameters, cosmology: theory, large-scale structure of Universe
Issue or Number:4
Record Number:CaltechAUTHORS:20220525-91641000
Persistent URL:
Official Citation:Lukas Wenzl, Cyrille Doux, Chen Heinrich, Rachel Bean, Bhuvnesh Jain, Olivier Doré, Tim Eifler, Xiao Fang, Cosmology with the Roman Space Telescope – Synergies with CMB lensing, Monthly Notices of the Royal Astronomical Society, Volume 512, Issue 4, June 2022, Pages 5311–5328,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114924
Deposited By: George Porter
Deposited On:31 May 2022 17:27
Last Modified:31 May 2022 17:27

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