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The Coronagraph Instrument of the Nancy Grace Roman Space Telescope (RomanCoronagraph) will be capable of both total intensity and polarizationmeasurements of circumstellar disks. The polarimetric performance is impactedby polarization effects introduced by all mirrors before the Wollaston prisms.In this paper, we aim to characterize these effects for the Roman Coronagraphin bands 1 and 4 using the FALCO and PROPER packages. We simulate the effect ofpolarization aberrations that impact the polarimetric contrast and theinstrumental polarization effects to study the polarimetric accuracy. Weinclude spacecraft rolls, but leave out systematic camera noise. We find thatpolarimetric differential imaging (PDI) improves the contrast by a factor ofsix. The PDI contrast of $\sim 8 \times 10^{-11}$ is limited by polarizedspeckles from instrumental polarization effects and polarization aberrations.By injecting polarized companions with at various contrast levels anddemodulating their polarimetric signal, we recover their source Stokes vectorwithin 2%.

FALCO simulations of high-contrast polarimetry with the Nancy Grace Roman Space Telescope Coronagraph Instrument