The Manticore Project II: Bayesian digital twins of cosmic structure across the SDSS and BOSS volumes
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2026
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Abstract
Abstract We present Manticore-Deep, a high-resolution Bayesian field-level reconstruction of cosmic large-scale structure over a comoving volume of (4 h−1Gpc)3 to z ≈ 0.7 at ~4 h−1 Mpc resolution. Extending the companion Manticore-Local analysis (Paper I), Manticore-Deep jointly constrains five galaxy redshift surveys—2M++, 6dFGS, 2dFGRS, SDSS, and BOSS—within a single hierarchical Bayesian framework using the BORG algorithm. The inference reconstructs primordial initial conditions evolved under gravity, yielding a posterior ensemble of three-dimensional density and velocity fields that causally reproduce the observed large-scale structure. A novel tiled inference strategy extends the reconstructed volume by more than an order of magnitude beyond Paper I. Posterior realisations are consistent with ΛCDM, reproducing Gaussian isotropic initial conditions and the expected z = 0 matter power spectrum, bispectrum, and halo mass function over the resolved scales. We validate the reconstruction using two independent template-free posterior-predictive tests against observations excluded from the inference. Cross-correlation with the Planck PR3 CMB lensing map yields a cumulative detection significance of 7.4 σ, while velocity-weighted stacking of 64, 750 galaxy clusters on the Planck 217 GHz map detects the kinetic Sunyaev–Zel’dovich effect at 3.5σ, with a model-independent approach–recession split confirming the inferred velocities. Together, these tests validate both the projected-density and three-dimensional velocity fields recovered by Manticore-Deep. The BOSS Great Wall is recovered as a ~3σ overdensity consistent with ΛCDM across the posterior ensemble. Manticore-Deep establishes a benchmark for survey-depth constrained cosmological digital twins and reproducible field-level validation of large-scale structure reconstructions.
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| Authors | Stuart McAlpine, Jens Jasche, Guilhem Lavaux, Ludvig Doeser, A. Loureiro |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1366
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| Keywords | Keywords not found |
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