Papers › Modified gravity constraints with Planck ISW-lensing bispectrum
Modified gravity constraints with Planck ISW-lensing bispectrum
Anton Chudaykin, Martin Kunz, Julien Carron
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We present updated constraints on modified gravity by including the Integrated Sachs-Wolfe (ISW) effect from CMB lensing-CMB temperature cross-correlations, based on the latest Planck PR4 maps. Utilizing the Effective Field Theory of dark energy approach and adopting the w₀wₐCDM background cosmological model, we find that including the CMB ISW lensing cross-correlations tighten constraints on the modified gravity parameters by approximately 20%, reducing the viable parameter space by 40-80%. We derive constraints from Planck CMB, Planck and ACT CMB lensing, DESI DR1 BAO, CMB ISW-lensing, and type Ia supernovae (SN Ia) data. The constraints on the EFT parameters controlling the kinetic braiding and non-minimal coupling are consistent with General Relativity (GR) at the 95% CL. In particular, we obtain a bound on the kinetic braiding parameter, c_B < 1.2 at 95% CL. In the w₀-wₐ parameter space, our results imply a crossing of the phantom divide, w=-1. The modified gravity model shows a mild preference over ΛCDM at the 1.8σ, 2.6σ and 3.2σ levels for the combinations with Pantheon+, Union3 and DESY5 supernova datasets. We find that using the latest HiLLiPoP+LoLLiPoP likelihoods alleviates the departure of modified gravity parameters from the GR-values compared to results using {\it Planck} 2018 data. This paper underlines the importance of the ISW lensing probe in constraining late-time modifications of gravity.
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