Version 1.42 introduces a dependence-aware joint significance framework for evaluating anisotropic cosmic birefringence in Planck 2018 polarization data. The dataset includes reconstructed rotation fields, parity analysis products, harmonic fits, and a joint null ensemble of 165,000 simulations. It was authored by Amy Condit of 22 Blue CMB Birefringence & Standing-Wave Rotation Field and last updated on 2026-06-18.
Use Cases
- Validate anisotropic cosmic birefringence signals based on the reconstructed α(ℓ) rotation series and αₗₘ map.
- Assess joint statistical significance based on the dependence-aware framework using a shared null ensemble of 165,000 realizations.
- Analyze harmonic structure patterns based on fits for k = {3, 4, 7} over multipoles ℓ = 500–1500.
- Investigate parity asymmetry based on the low-L even/odd parity analysis of the αₗₘ map with dipole removed.
Strengths
- Includes a large empirical null ensemble of 165,000 simulations for robust significance testing.
- Provides joint validation across multiple components: parity analysis, harmonic structure, and cross-validation splits.
- Results show high statistical significance with p ≈ 6.1 × 10⁻⁶ (≈ 4.4σ one-sided) for both parity and harmonic structure tests.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Freshness should be verified as the last update was 2026-06-18.
Provenance
- Source
- Planck 2018 polarization data (SMICA and NILC component separation methods).
- Collection Method
- Reconstructed from EB cross-spectra over multipoles ℓ = 500–1500 and decomposed into spherical-harmonic modes.
- Freshness
- Last updated 2026-06-18 00:54:32