Pith. sign in

REVIEW 2 minor 111 cited by

HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere

T0 review · 0 major / 2 minor · reviewed 2026-05-13 · grok-4.3

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗ Review JSON

Pith's one-line read HEALPix supplies a hierarchical equal-area pixel grid on the sphere that permits direct fast computation on very large astronomical maps.

desk verdict HEALPix gives a workable pixelization scheme with equal-area, iso-latitude, and hierarchical properties plus attached fast algorithms that directly support large spherical map work. read the letter →

arxiv astro-ph/0409513 v1 pith:XYOCYZKL submitted 2004-09-21 astro-ph

K. M. Gorski , E. Hivon , A. J. Banday , B. D. Wandelt , F. K. Hansen , M. Reinecke , M. Bartelman This is my paper · ORCID
classification astro-ph
keywords HEALPixsphericalpixelizationequal-areatessellationCMBmapanalysisharmonictransformastronomicaldataprocessingall-skysurveys
checked against eight_tick_forces_D3Foundation.DimensionForcing
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper presents HEALPix as a data structure designed to discretize the sphere into equal-area pixels arranged in iso-latitude rings with a nested hierarchical structure. This grid, together with its associated algorithms, enables scientific calculations such as spherical harmonic transforms and map manipulations to be performed directly on the pixels without repeated interpolation or re-projection. The scheme was built to handle the data volumes from current and upcoming CMB experiments, where maps contain millions to billions of pixels. A reader would care because it removes a practical bottleneck that otherwise forces astronomers to trade resolution for speed when analyzing full-sky surveys.

What carries the argument

The HEALPix pixelization: a nested, equal-area, iso-latitude tessellation of the sphere whose pixel centers follow rings of constant latitude and whose hierarchy supports rapid neighbor lookup and multi-resolution operations.

What would settle it

A timing test showing that the spherical harmonic transform time on HEALPix maps grows faster than linearly with pixel count once the map exceeds roughly 10^8 pixels.

Watch

Extended reading notes

Core claim

HEALPix is a versatile data structure with an associated library of computational algorithms and visualization software that supports fast scientific applications executable directly on very large volumes of astronomical data and large area surveys in the form of discretized spherical maps.

Load-bearing premise

The geometric and hierarchical properties chosen for the pixelization will continue to satisfy the requirements for efficient discretization and fast analysis as data volumes grow without unforeseen scaling limitations.

Editorial extensions

If this is right

  • Spherical harmonic analysis and synthesis can be executed directly on the native pixel grid of a survey.
  • Map-making and power-spectrum estimation pipelines avoid repeated reprojection steps when moving between resolutions.
  • The same data structure supports both visualization and quantitative analysis without format conversion.
  • Future all-sky surveys can be stored and processed at native resolution without down-sampling.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The same grid could be used for any scalar or vector field defined on a sphere, such as planetary surface temperatures or ocean-current models.
  • Because the pixelization is fixed and hierarchical, it offers a natural coordinate system for comparing observations taken at different epochs or instruments.
  • The iso-latitude property simplifies the implementation of fast Fourier transforms along latitude rings, which may be reusable in other spherical numerical methods.
Share X Bluesky LinkedIn Reddit HN

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 2 minor

Summary. The manuscript presents HEALPix, a hierarchical equal-area iso-latitude pixelization of the sphere, together with associated indexing, neighbor-finding, and spherical-harmonic transform algorithms. It states the geometric and computational requirements for efficient discretization and fast analysis/synthesis of large spherical datasets (particularly CMB maps) and shows how the HEALPix construction satisfies those requirements through explicit mappings that achieve O(N log N) transform cost.

Significance. If the algorithmic claims hold, HEALPix supplies a practical, scalable data structure and software library that enables direct scientific analysis on very large discretized spherical maps without intermediate projections. The explicit geometric derivations and the provision of a reusable computational framework constitute a concrete contribution to astronomical data handling.

minor comments (2)
  1. [Abstract] The abstract and introduction would benefit from an explicit statement of the measured or derived scaling of the spherical-harmonic transform (O(N log N)) to make the efficiency claim immediately quantifiable.
  2. [Figures] Figure captions should include the pixel resolution (N_side) and the coordinate system used so that readers can reproduce the displayed maps without consulting the main text.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of the manuscript and the recommendation to accept. The report contains no major comments requiring response.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity in HEALPix derivation chain

full rationale

The paper constructs the HEALPix scheme from explicit geometric requirements (equal-area, iso-latitude, hierarchical) stated upfront, then derives indexing, neighbor-finding, and transform algorithms directly from those properties. No load-bearing step reduces by construction to a fitted input, self-citation, or ansatz smuggled from prior work; the O(N log N) cost follows from the hierarchical structure without circular redefinition. The framework is self-contained against the listed requirements.

Assumptions & free parameters 0 free parameters · 1 assumptions · 1 invented entities

The framework rests on standard spherical geometry for equal-area and iso-latitude partitioning plus hierarchical subdivision rules; no free parameters are fitted to data and no new physical entities are postulated.

assumptions (1)
  • domain assumption The sphere can be partitioned into equal-area pixels arranged in iso-latitude rings while preserving hierarchical nesting
    Invoked in the design summary that shows how HEALPix meets the discretization requirements.
invented entities (1)
  • HEALPix pixelization scheme
    purpose: Provide a data structure for fast spherical map operations
    New discretization introduced by the paper to satisfy the listed computational requirements.

how reviews work

0 comments
Cite this review

Pith. "Pith review of HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere." pith.science (2026). https://pith.science/paper/XYOCYZKL

@misc{pith2026astro-ph0409513,
  author       = {Pith},
  title        = {Pith review of: HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/XYOCYZKL}},
  note         = {Machine review of arXiv:astro-ph/0409513}
}
read the original abstract

HEALPix -- the Hierarchical Equal Area iso-Latitude Pixelization -- is a versatile data structure with an associated library of computational algorithms and visualization software that supports fast scientific applications executable directly on very large volumes of astronomical data and large area surveys in the form of discretized spherical maps. Originally developed to address the data processing and analysis needs of the present generation of cosmic microwave background (CMB) experiments (e.g. BOOMERanG, WMAP), HEALPix can be expanded to meet many of the profound challenges that will arise in confrontation with the observational output of future missions and experiments, including e.g. Planck, Herschel, SAFIR, and the Beyond Einstein CMB polarization probe. In this paper we consider the requirements and constraints to be met in order to implement a sufficient framework for the efficient discretization and fast analysis/synthesis of functions defined on the sphere, and summarise how they are satisfied by HEALPix.

Discussion (0). Continue with ORCID to comment.

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

  • Foundation.DimensionForcing eight_tick_forces_D3 echoes
    ?
    echoes

    ECHOES: this paper passage has the same mathematical shape or conceptual pattern as the Recognition theorem, but is not a direct formal dependency.

    HEALPix – the Hierarchical Equal Area iso-Latitude Pixelization – is a versatile data structure... Originally developed to address the data processing and analysis needs... In this paper we consider the requirements and constraints to be met in order to implement a sufficient framework for the efficient discretization and fast analysis/synthesis of functions defined on the sphere

  • Foundation.DimensionForcing alexander_duality_circle_linking echoes
    ?
    echoes

    ECHOES: this paper passage has the same mathematical shape or conceptual pattern as the Recognition theorem, but is not a direct formal dependency.

    The resolution of the grid is expressed by parameter Nside which defines the number of divisions along the side of a base-resolution pixel... All pixel centers are placed on rings of constant latitude, and are equidistant in azimuth (on each ring).

What do these tags mean?
matches
The paper's claim is directly supported by a theorem in the formal canon.
supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses
The paper appears to rely on the theorem as machinery.
contradicts
The paper's claim conflicts with a theorem or certificate in the canon.
unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Forward citations

Showing 60 of 111 Pith papers that cite this

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 5,046 citations worldwide. See all 111 Pith citations

  1. Shear-kSZ: A New Estimator for the Matter-Electron Power Spectrum from kSZ Tomography and Weak Lensing

    astro-ph.CO 2026-07 conditional novelty 7.0 of 10

    Shear–kSZ correlates kSZ, tomographic line-of-sight velocity, and lensing convergence to measure P_me(k) and thereby the baryonic matter-power suppression S(k) at high forecast significance.

  2. Analytical covariances for catalogue-based pseudo-$C_\ell$s

    astro-ph.CO 2026-07 conditional novelty 7.0 of 10

    A new analytic method computes disconnected covariance matrices for catalogue-based pseudo-Cℓ power spectra by smoothing source positions and treating self-pair shot noise exactly.

  3. Polarized Anisotropic Stochastic Gravitational Wave Background Search with Ground-Based Detector Networks

    gr-qc 2026-05 unverdicted novelty 7.0 of 10

    Implements full-Stokes SGWB map-making for ground-based networks, applies to LVK O3 data, and constrains polarized angular spectra while showing intensity-only models can be biased.

  4. Non-Gaussianity in SMICA

    astro-ph.CO 2025-11 unverdicted novelty 7.0 of 10

    New SMICA formalism and binned bispectrum estimator jointly recover power spectra, spectral parameters, foreground 3-point correlators, and primordial non-Gaussianity constraints from multi-frequency polarization maps...

  5. Where Galaxies Point: First Measurement of the Large-Scale Axial Intrinsic Alignment

    astro-ph.CO 2025-11 reject novelty 7.0 of 10

    DES galaxy position angles show a coherent preferred axis (RA≈300°, Dec≈50°) — elliptical major and spiral minor axes aligned along it — reported as the first detection of horizon-scale axial intrinsic alignment.

  6. Deep Learning for CMB Foreground Removal and Beam Deconvolution: A U-Net GAN Approach

    astro-ph.IM 2025-08 unverdicted novelty 7.0 of 10

    A U-Net GAN reconstructs CMB T and E maps from Planck-like simulations with foregrounds and systematics, achieving under 1% error outside the Galactic region and demonstrating first-time correction for non-circular be...

  7. Distinguishing Monochromatic Signals in LISA and Taiji: Ultralight Dark Matter versus Gravitational Waves

    hep-ph 2025-06 conditional novelty 7.0 of 10

    Null-response interferometric channels can separate monochromatic ultralight dark matter signals from gravitational waves in LISA and Taiji, most effectively at high frequencies.

  8. Minimizing Contaminant Leakage in Internal Linear Combination Maps Using a Data-Driven Approach

    astro-ph.CO 2025-05 conditional novelty 7.0 of 10

    Data-driven selection of the effective CIB spectral index per multipole bin enables unbiased, higher signal-to-noise tSZ-halo cross-correlations without moment deprojection.

  9. Searching for Inflationary Physics with the CMB Trispectrum: 2. Code & Validation

    astro-ph.CO 2025-02 conditional novelty 7.0 of 10

    PolySpec is a public, validated suite of near-optimal quartic estimators that lets the CMB four-point function probe many inflationary models beyond local non-Gaussianity.

  10. Searching for Inflationary Physics with the CMB Trispectrum: 1. Primordial Theory & Optimal Estimators

    astro-ph.CO 2025-02 conditional novelty 7.0 of 10

    A set of quasi-optimal CMB trispectrum estimators is derived for local, EFT, direction-dependent, spinning-particle, point-source, and lensing templates, enabling first collider searches.

  11. Pixelization effects in cosmic shear angular power spectra

    astro-ph.CO 2025-01 conditional novelty 7.0 of 10

    Pixelization biases in pseudo-C_ell cosmic shear estimators are modeled from first principles, including a spin-2 HEALPix window derivation and empty-pixel corrections.

  12. Tracing cosmic gas in filaments and halos: Low-redshift insights from the kinematic Sunyaev-Zel'dovich effect

    astro-ph.CO 2024-12 conditional novelty 7.0 of 10

    A 4-sigma kinematic Sunyaev-Zel'dovich quadrupole detection shows gas around low-redshift galaxy groups is aligned with cosmic filaments, the first such kSZ measurement.

  13. Cosmography for a General Spacetime Centred at Arbitrary Redshift

    astro-ph.CO 2026-08 conditional novelty 6.0 of 10

    A general-relativistic cosmographic expansion centered at arbitrary redshift is derived and tested on void and overdensity LTB models, showing that its coefficients lose strict local meaning near density gradients.

  14. Single Frequency CMB Foreground Removal with Inter-scale Machine Learning

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    A hybrid CNN using both inter-scale and multi-frequency dust correlations achieves residual B-mode foreground power 3.62e-4 in DustFilaments simulations, about 7x lower than spatial ILC.

  15. The Twentieth Data Release of the Sloan Digital Sky Survey: First All-Sky BOSS Spectra, eROSITA-SDSS-V Mapper Coordinated Observations, and a Preview of the Local Volume Mapper

    astro-ph.GA 2026-07 accept novelty 6.0 of 10

    DR20 releases over three million BOSS spectra (first southern-hemisphere SDSS-V optical data), 169 LVM integral-field tiles over six targets, and eighteen value-added catalogs.

  16. Outflows in super-Eddington quasars drive clumpy circumgalactic medium and extended H$\alpha$ nebulae at $z \gtrsim 6$

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    In z≈6 quasar simulations, super-Eddington black-hole growth clears escape channels, ejects cold clumps that raise neutral-hydrogen covering, and powers extended Hα nebulae that shrink when the quasar is obscured.

  17. Galactic Science with the LiteBIRD satellite: Spectral characterization of diffuse Galactic polarized emission at the angular power spectrum level

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    LiteBIRD is forecast to measure Galactic polarized dust and synchrotron spectral parameters with errors as low as σ(T_d)≈0.2 K, σ(β_d)≈0.006, σ(β_s)≈0.04, and to detect E/B and T/P spectral discrepancies in the diffuse ISM.

  18. Comparing explicit likelihood and likelihood-free simulation-based inference for weak lensing cosmic shear

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    On Euclid-like Gaussian mocks, likelihood-free inference stays well-calibrated under emulator error and non-Gaussian summaries, while explicit Gaussian-likelihood inference becomes miscalibrated and can disagree with ...

  19. Atomic Design Transformer: Scaffold-Conditioned 3D Molecule Generation via xTB-Reward Reinforcement Learning

    physics.comp-ph 2026-07 conditional novelty 6.0 of 10

    A plain causal transformer that tokenizes atom positions in local frames generates 3D molecules directly; RL against an xTB relaxation reward lifts topology-preserving valid yield from ~50% to ~95%.

  20. Assessing the large-scale angular clustering of UNIONS Lyman Break Galaxies via cross-correlations

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    UNIONS Lyman-break galaxy auto-clustering is unusable at large scales due to imaging systematics, but LBG x CMB-lensing and LBG x quasar cross-spectra are measured robustly, with amplitudes consistent with predictions.

  21. Milky Way Atlas: A radial-velocity-resolved, three-dimensional map of H I within 1.25 kpc

    astro-ph.GA 2026-07 unverdicted novelty 6.0 of 10

    A Bayesian inference method combining HI4PI radio data with Gaia-based 3D dust maps reconstructs the 3D density, velocity, and line-width of local atomic hydrogen within 1.25 kpc, validated by synthetic tests and inde...

  22. FRANZ: Framework for analytical one-zone blastwave dynamics

    astro-ph.GA 2026-07 accept novelty 6.0 of 10

    A local thin-shell blastwave framework recovers classical SNR limits and shows galactic shear, gravity, and filaments deform remnants and can systematically overestimate ages in structured media.

  23. Directional dark matter signatures of the Large Magellanic Cloud

    hep-ph 2026-06 unverdicted novelty 6.0 of 10

    Auriga simulations show the LMC induces azimuthal anisotropies in directional DM recoils that enhance discovery prospects relative to the Standard Halo Model.

  24. VarWISE: Infrared Variability via NEOWISE Single Exposure Photometry

    astro-ph.SR 2026-05 unverdicted novelty 6.0 of 10

    VarWISE catalog identifies 457,080 high-confidence infrared variables (49.81% new) and an extended set of 1.9 million from NEOWISE photometry via spatial clustering, VARnet detection, and XGBoost classification.

  25. Radio sirens: inferring $H_0$ with binary black holes and neutral hydrogen in the era of the Einstein Telescope and the SKA Observatory

    astro-ph.CO 2026-05 unverdicted novelty 6.0 of 10

    Using simulated binary black hole mergers and neutral hydrogen maps, the radio sirens method constrains H0 to 8% precision with 3000 high-SNR events, offering a 90% improvement over standard dark siren analyses.

  26. FLAMINGO: The thermal history of the Universe from tSZ effect cross-correlations and its dependencies on cosmology and baryon physics

    astro-ph.CO 2026-05 unverdicted novelty 6.0 of 10

    tSZ cross-correlations with large-scale structure tracers prefer low S8 and strong baryonic feedback, yielding S8 = 0.72 and low group baryon fraction in FLAMINGO simulations.

  27. Enhanced foreground mitigation in thermal SZ Compton-$y$ maps via polarization and deprojection

    astro-ph.CO 2026-03 conditional novelty 6.0 of 10

    Combining temperature and polarization in a needlet ILC cuts residual Galactic contamination in the Planck thermal SZ y-map by about 40% (IRAS cross-correlation), with larger projected gains for future low-noise surveys.

  28. DESI DR2 Baryon Acoustic Oscillations from the Lyman Alpha Forest Multipoles

    astro-ph.CO 2026-03 conditional novelty 6.0 of 10

    A Legendre-multipole BAO analysis of the DESI DR2 Lyα forest yields αiso=0.9997±0.0096 and αAP=0.9986±0.0276, consistent with the baseline, using an unsmoothed positive-definite covariance.

  29. SPT-3G D1: A Measurement of Secondary Cosmic Microwave Background Anisotropy Power

    astro-ph.CO 2026-01 conditional novelty 6.0 of 10

    SPT-3G's 2019–2020 spectra at ell=1700–11000 give D_tSZ=4.91±0.37 μK^2 and D_kSZ=1.75±0.86 μK^2 at ell=3000 (free-CIB model) and a 95% limit Δz_re<3.8 on the reionization duration.

  30. Validating Digital Twins of the Local Universe with the Thermal Sunyaev-Zel'dovich Signal

    astro-ph.CO 2026-01 conditional novelty 6.0 of 10

    A new tSZ-based validation of BORG digital twins shows that the CSiBORG-Manticore suite reproduces local cluster positions and weak-lensing-calibrated masses better than the previous CSiBORG generation.

  31. From metallicity distributions to mutual information: A new perspective on stellar halo assembly

    astro-ph.GA 2025-11 conditional novelty 6.0 of 10

    Mutual information between angular position and binary metallicity increases with radius in all five Aquarius stellar halos, and after satellite removal the residual signal is confined to the inner ~30-50 kpc.

  32. Full calibration of the tomographic redshift distribution from the HSC PDR3 Shape Catalog with DESI

    astro-ph.CO 2025-11 conditional novelty 6.0 of 10

    Clustering redshifts with DESI DR1/DR2 calibrate all four HSC Y3 tomographic bins; bins 3 and 4 shift to higher redshift (dz3=-0.039, dz4=-0.048) but less than cosmic shear analyses implied.

  33. The first AKRA mass map reconstruction from HSC Y1 data

    astro-ph.CO 2025-11 unverdicted novelty 6.0 of 10

    AKRA produces the first unbiased kappa maps from HSC Y1 shear catalogs, with simulation tests confirming no bias in power spectrum, variance, skewness, and PDF statistics.

  34. Stellar-like Galactic center excess challenges particle dark matter

    hep-ph 2025-11 conditional novelty 6.0 of 10

    A mixed stellar-bulge and dark-matter fit to Fermi-LAT Galactic Center data yields upper limits on the annihilation cross section that reach the thermal relic line for masses ≲300 GeV under a contracted NFW halo profile.

  35. Directional Search for Persistent Gravitational Waves: Results from the First Part of LIGO-Virgo-KAGRA's Fourth Observing Run

    gr-qc 2025-10 conditional novelty 6.0 of 10

    An 8.3-year LIGO–Virgo–KAGRA search for persistent, direction-dependent gravitational waves finds no signal and yields the most restrictive upper limits to date on anisotropic backgrounds and targeted sources.

  36. The superclustering of hot gas: cosmological sensitivity in the Websky simulations

    astro-ph.CO 2025-10 conditional novelty 6.0 of 10

    Higher-order multipole moments of oriented tSZ stacks around superclusters retain cosmological sensitivity similar to the monopole while being less affected by gas-pressure modeling choices, which may help break the g...

  37. Robust Measurement of Stellar Streams Around the Milky Way: Correcting Spatially Variable Observational Selection Effects in Optical Imaging Surveys

    astro-ph.GA 2025-10 unverdicted novelty 6.0 of 10

    A method using Balrog synthetic injections corrects spatially variable detection and classification rates in DES Y3 data, reducing relative detection rate standard deviation by a factor of five and lowering bias in st...

  38. QML-FAST -- A Fast Code for low-$\ell$ Tomographic Maximum Likelihood Power Spectrum Estimation

    astro-ph.CO 2025-10 conditional novelty 6.0 of 10

    QML-FAST provides a fast, optimal QML power spectrum code for low-ℓ tomographic analysis of up to dozens of correlated scalar fields on the sphere, with public release and validation showing gains over pseudo-C_ℓ at l...

  39. Constraining Inflationary Particle Production with CMB Polarization

    astro-ph.CO 2025-09 unverdicted novelty 6.0 of 10

    No evidence for primordial hotspots in Planck polarization data leads to improved bounds on inflationary particle production couplings for light particles.

  40. Probing the limits of cosmological information from the Lyman-$\alpha$ forest 2-point correlation functions

    astro-ph.CO 2025-09 unverdicted novelty 6.0 of 10

    Using idealized synthetic data, knowing the true continuum in Lyα forest auto- and cross-correlations reduces uncertainties on the AP parameter and Ω_m by ~10%, with extension to 240 h^{-1}Mpc scales adding up to ~15%...

  41. Uncertainty in Hadronic Diffuse $\gamma$-Ray Emission from the Temporal Stochasticity of Cosmic-Ray Sources

    astro-ph.HE 2025-09 conditional novelty 6.0 of 10

    Temporal stochasticity of cosmic-ray sources causes a normalization uncertainty in the local proton flux that propagates into a hadronic gamma-ray uncertainty of 30-100%, comparable to or exceeding experimental errors...

  42. Mapping the Gravitational-wave Background Across the Spectrum with a Next-Generation Anisotropic Per-frequency Optimal Statistic

    astro-ph.IM 2025-09 conditional novelty 6.0 of 10

    A new pulsar-timing-array pipeline maps the gravitational-wave sky per frequency, folds cosmic variance into significance estimates, and detects a simulated loud source at p=0.01 versus 0.2 broadband.

  43. DECADE+DES Y3 Weak Lensing Mass Map: A 13,000 deg$^2$ View of Cosmic Structure from 270 Million Galaxies

    astro-ph.CO 2025-09 conditional novelty 6.0 of 10

    A 13,000 square degree weak lensing mass map, the largest to date, with a first demonstration of filament detection from lensing alone.

  44. How many pixels are there in a polarized pulsar timing array map?

    astro-ph.IM 2025-07 conditional novelty 6.0 of 10

    Without pulsar distances, a pulsar timing array can resolve at most about 16 sky directions times 2 polarization states, about 32 independent polarized gravitational wave sources per frequency.

  45. Minimal Dark Matter in the sky: updated Indirect Detection probes

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Fermi-LAT data exclude the lower end of the Minimal Dark Matter 5-plet thermal mass window, while about 600 hours of CTAO observations of Ursa Major II could probe the central mass.

  46. Planck constraints on the scale dependence of isotropic cosmic birefringence

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

    Planck polarization data favor a constant cosmic birefringence angle (β≈0.3°) across multipoles, with scale dependence consistent with zero at up to 1.8σ.

  47. Simulating Partial Sky Cosmic Microwave Background Maps with 3D Fast Fourier Transforms

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

    A 3D fast Fourier transform method with a linear-programming-derived power spectrum simulates CMB maps on partial-sky patches, with operation-count scaling suggesting speed advantages over HEALPix for some survey sizes.

  48. All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run

    gr-qc 2025-07 accept novelty 6.0 of 10

    No long-duration gravitational-wave transients were found in O4a data; 50% efficiency amplitude limits improved by about 30% over O3, and eccentric CBC rate limits improved by factors of 2-7.

  49. Lya2pcf: an efficient pipeline to estimate two- and three-point correlation functions of the Lyman-$\alpha$ forest

    astro-ph.CO 2025-06 unverdicted novelty 6.0 of 10

    Lya2pcf is an efficient pipeline implementing standard algorithms for 2PCF and 3PCF of the Lyman-alpha forest, with GPU speedups over PICCA and the first large-sample anisotropic 3PCF measurement up to 80 Mpc/h.

  50. Cosmology from Planck CMB Lensing and DESI DR1 Quasar Tomography

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    DESI DR1 quasars cross-correlated with Planck PR4 lensing give sigma8 = 0.929 and S8 = 0.922, about 1.5 sigma above Planck's LCDM prediction, and a sound-horizon-free H0 = 69.1 km/s/Mpc.

  51. Learning Correlated Astrophysical Foregrounds with Denoising Diffusion Probabilistic Models

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    A denoising diffusion model trained on Agora simulations generates correlated CIB and tSZ foreground patches that reproduce 2-, 3-, and 4-point statistics, histograms, and Minkowski functionals.

  52. Cosmic filaments confirm unexplained CMB temperature decrements in two independent redshift ranges

    astro-ph.CO 2025-06 unverdicted novelty 6.0 of 10

    The paper detects CMB temperature decrements toward the spines of massive cosmic filaments in two independent nearby redshift ranges using 3D luminosity-density profiles.

  53. Searching for Inflationary Physics with the CMB Trispectrum: 3. Constraints from Planck

    astro-ph.CO 2025-02 accept novelty 6.0 of 10

    A comprehensive Planck PR4 trispectrum analysis finds no primordial non-Gaussianity across 33 templates and sets leading constraints, including tau_NL loc < 1500 at 95% CL.

  54. Time-delayed gamma-ray signatures of heavy axions from core-collapse supernovae

    hep-ph 2024-12 conditional novelty 6.0 of 10

    No gamma-ray excess from four supernovae in Fermi-LAT data yields the strongest constraints yet on MeV-to-GeV heavy axions coupled to both QED and QCD.

  55. Redshift tomography of the kinematic matter dipole

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    Redshift bin edges create a Doppler-boost boundary term in the kinematic matter dipole that can match or reverse the standard Ellis-Baldwin signal.

  56. DeepWiener: Neural Networks for CMB polarization maps and power spectrum computation

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    A U-Net trained on a Wiener-filter loss reconstructs polarized CMB E and B modes from masked noisy maps, making power spectrum estimation fast and less biased at low multipoles.

  57. Reconstructing the Thermal Sunyaev Zeldovich Power Spectrum from Planck using the ABS Method

    astro-ph.CO 2024-12 unverdicted novelty 6.0 of 10

    The ABS method applied to Planck PR3 data yields a tSZ power spectrum amplitude 34% lower than the Planck 2015 best-fit when trispectrum is included.

  58. Estimating the gravitational wave background anisotropy: a Bayesian approach boosted by cross-correlation angular power spectrum

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    A new likelihood function estimates GWB anisotropy angular power spectra directly from detector data, and cross-correlation with the CMB can make the quadrupole measurable with four years of LISA data.

  59. Mitigating Imaging Systematics for DESI 2024 Emission Line Galaxies and Beyond

    astro-ph.CO 2024-11 conditional novelty 6.0 of 10

    Imaging systematics corrections for DESI DR1 ELGs agree across methods; BAO is robust, and a 3D selection function is required for the 0.6<z<0.8 extension.

  60. DESI 2024 II: Sample Definitions, Characteristics, and Two-point Clustering Statistics

    astro-ph.CO 2024-11 accept novelty 6.0 of 10

    DESI DR1 large-scale structure catalogs and two-point clustering measurements are constructed with completeness and systematics corrections and validated against simulations to within 2% in inferred density.

See all 111 Pith citations

Reference graph

Works this paper leans on

12 extracted references · 12 canonical work pages · cited by 111 Pith papers (see all)

  1. [1]

    Baumgardner, J. R. & Frederickson, P. O. 1985, SIAM J. Numeri cal Analysis, 22, 1107

    work page 1985

  2. [2]

    Benoit, A., et al, A&A 2003, 399, L23-L30

    work page 2003

  3. [3]

    Benoit, A., et al, A&A, 2003, 399, L19-L23

    work page 2003

  4. [4]

    & Turok, N

    Crittenden, R. & Turok, N. G. 1998, astro-ph/9806374 – 13 – de Bernardis, P. et al., 2000, Nature 404, 955

    work page Pith review arXiv 1998

  5. [5]

    et al., 2003, astro-ph/0305537

    Doroshkevich, A.G. et al., 2003, astro-ph/0305537

    work page Pith review arXiv 2003

  6. [6]

    Driscoll, J. R. & Healy, D. 1994, Adv. in Appl. Math., 15, 202 G´ orski, K. M., Hivon, E., & Wandelt, B. D. 1998, in the Procee dings of the MPA/ESO Conference ”Evolution of Large-Scale Structure: from Reco mbination to Garching”, eds. A.J. Banday, R.K. Sheth & L. Da Costa, Printpartners Ips kamp NL, pp. 37-42 (astro-ph/9812350)

    work page Pith review arXiv 1994

  7. [7]

    F, Natoli, P

    Muciaccia, P. F, Natoli, P. & Vittorio, N. 1998, Ap.J., 488, L 63

    work page 1998

  8. [8]

    E., et al, 2003, ApJ 599, 786 Saff, E

    Ruhl, J. E., et al, 2003, ApJ 599, 786 Saff, E. B. & Kuijlaars, A. B. J. 1997, The Mathematical Intell igencer, 19, #1, 5

    work page 2003

Show all 12 references
  1. [9]

    & Brunner R.J

    Szalay, A.S. & Brunner R.J. 1999, Future Generation Compute r Systems, 16, 63; astro- ph/9812335

    1999

  2. [10]

    1996, ApJ, 470, L81

    Tegmark, M. 1996, ApJ, 470, L81

    1996

  3. [11]

    & G´ orski, K.M

    Wandelt, B.D., Hivon, E. & G´ orski, K.M. 1998, in ”Fundamental Parameters in Cosmology”, proceedings of the XXXIIIrd Rencontres de Moriond, eds. Tra n Thanh Van; astro- ph/9803317

    1998

  4. [12]

    1992, in ASP Conf

    White, R.A., and Stemwedel, S.W. 1992, in ASP Conf. Ser. 25, A stronomical Data Analy- sis, Software and Systems I, eds. D.M. Worrall, C. Biemesder fer, & J. Barnes (San Francisco:ASP), 379 Wilkinson Microwave Anisotropy Probe, First-Year results from WMAP, 2003, ApJS, 148,1- ...

    1992

Pith tools

Reviewed May 13, 2026 · model on record in the stance chip above.