The authors derive the fourth-order galaxy-galaxy lensing 4PCF and aperture statistics, implement a numerical pipeline and FFT estimator, and detect the connected ⟨N³ M_ap⟩ signal at SNR ~9 in stage IV mock data over 2000 deg².
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A pipeline combining mutual information screening with alternating symbolic regression recovers closed-form degeneracy equations from posterior samples.
Volume-limited HETDEX [OII] samples at z≤0.48 have number densities 5–10 imes higher than typical ELG surveys and power spectra consistent with log(M0/h−1M⊙)≈11.9–12.3 and a weak luminosity slope a=0.37±0.10.
A method called the degeneracy distillery uses symbolic transformations to flatten the Fisher information matrix globally from simulations alone, identifying independent parameter combinations and reducing neural posterior estimation simulation budgets by up to 10x.
UNIONS r-band data constrains S8 to 0.891^{+0.057}_{-0.084} via 2D harmonic-space cosmic shear, consistent with Planck at 0.79 sigma after modeling baryonic feedback and intrinsic alignments.
citing papers explorer
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Fourth-order galaxy-galaxy-lensing: Theoretical framework and direct estimation
The authors derive the fourth-order galaxy-galaxy lensing 4PCF and aperture statistics, implement a numerical pipeline and FFT estimator, and detect the connected ⟨N³ M_ap⟩ signal at SNR ~9 in stage IV mock data over 2000 deg².
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DegenDetector: Symbolic Recovery of Parameter Degeneracies in Bayesian Posteriors
A pipeline combining mutual information screening with alternating symbolic regression recovers closed-form degeneracy equations from posterior samples.
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HETDEX [OII] galaxies at $z \le 0.48$: Volume-limited samples and their power spectra
Volume-limited HETDEX [OII] samples at z≤0.48 have number densities 5–10 imes higher than typical ELG surveys and power spectra consistent with log(M0/h−1M⊙)≈11.9–12.3 and a weak luminosity slope a=0.37±0.10.
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The Degeneracy Distillery
A method called the degeneracy distillery uses symbolic transformations to flatten the Fisher information matrix globally from simulations alone, identifying independent parameter combinations and reducing neural posterior estimation simulation budgets by up to 10x.
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UNIONS-3500 Weak Lensing: IV. 2D cosmological constraints in harmonic space
UNIONS r-band data constrains S8 to 0.891^{+0.057}_{-0.084} via 2D harmonic-space cosmic shear, consistent with Planck at 0.79 sigma after modeling baryonic feedback and intrinsic alignments.