Cosmology with the Roman Space Telescope - Multiprobe strategies

Tim Eifler, Hironao Miyatake, Elisabeth Krause, Chen Heinrich, Vivian Miranda, Christopher Hirata, Jiachuan Xu, Shoubaneh Hemmati, Melanie Simet, Peter Capak, Ami Choi, Olivier Doré, Cyrille Doux, Xiao Fang, Rebekah Hounsell, Eric Huff, Hung Jin Huang, Mike Jarvis, Jeffrey Kruk, Dan MastersEduardo Rozo, Dan Scolnic, David N. Spergel, Michael Troxel, Anja Von Der Linden, Yun Wang, David H. Weinberg, Lukas Wenzl, Hao Yi Wu

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We simulate the scientific performance of the Nancy Grace Roman Space Telescope High Latitude Survey (HLS) on dark energy and modified gravity. The 1.6-yr HLS Reference survey is currently envisioned to image 2000 deg2 in multiple bands to a depth of ∼26.5 in Y, J, H and to cover the same area with slit-less spectroscopy beyond z = 3. The combination of deep, multiband photometry and deep spectroscopy will allow scientists to measure the growth and geometry of the Universe through a variety of cosmological probes (e.g. weak lensing, galaxy clusters, galaxy clustering, BAO, Type Ia supernova) and, equally, it will allow an exquisite control of observational and astrophysical systematic effects. In this paper, we explore multiprobe strategies that can be implemented, given the telescope's instrument capabilities. We model cosmological probes individually and jointly and account for correlated systematics and statistical uncertainties due to the higher order moments of the density field. We explore different levels of observational systematics for the HLS survey (photo-z and shear calibration) and ultimately run a joint likelihood analysis in N-dim parameter space. We find that the HLS reference survey alone can achieve a standard dark energy FoM of >300 when including all probes. This assumes no information from external data sets, we assume a flat universe however, and includes realistic assumptions for systematics. Our study of the HLS reference survey should be seen as part of a future community-driven effort to simulate and optimize the science return of the Roman Space Telescope.

Original languageEnglish (US)
Pages (from-to)1746-1761
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Oct 1 2021


  • cosmological parameters
  • cosmology: theory
  • large-scale structure of the Universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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