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Lentilles gravitationnelles

2 articles

Reconstructed linear matter power spectrum divided by the fiducial prediction, with 68% and 95% Monte Carlo bands.
Reconstructed linear matter power spectrum divided by the fiducial prediction, with 68% and 95% Monte Carlo bands.

2026 · prépublication arXiv

Finding the distribution of matter using lenses – I: deconvolution-based reconstruction with CMB lensing

Dawn, A., Jiang, J.-Q., Hazra, D. K., L'Huillier, B., Shafieloo, A.

We reconstruct the linear matter power spectrum at z=0z = 0 from joint Planck PR4, ACT DR6 and SPT-3G CMB lensing, using a modified Richardson–Lucy deconvolution. The result follows the linear prediction on large scales, lies systematically higher for k≳0.1 Mpc−1k \gtrsim 0.1\,\mathrm{Mpc}^{-1}, and partly preserves the BAO feature.

arXiv:2609.08457

Grandes structuresLentilles gravitationnelles

Reconstructions of a 5% oscillatory feature from 1000 noisy LSST-like mocks (blue), their median (green) and the truth (red).
Reconstructions of a 5% oscillatory feature from 1000 noisy LSST-like mocks (blue), their median (green) and the truth (red).

2026 · prépublication arXiv

Finding the distribution of matter using lenses – II: deconvolution-based reconstruction with 3×23\times2pt measurements

Jiang, J.-Q., Dawn, A., Hazra, D. K., L'Huillier, B., Shafieloo, A.

A regularised Richardson–Lucy framework tests scale-dependent departures from the nonlinear matter power spectrum using galaxy clustering, galaxy–galaxy lensing and cosmic shear. On LSST Year-10-like mocks, oscillations of about 1% or more are recovered over 0.1≲k≲0.5 Mpc−10.1 \lesssim k \lesssim 0.5\,\mathrm{Mpc}^{-1}, and a 1% oscillation is detected at about 2.6σ2.6\sigma.

arXiv:2609.08460

Grandes structuresLentilles gravitationnelles

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