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arxiv: 2606.25583 · v1 · pith:D7AUEWODnew · submitted 2026-06-24 · 🌌 astro-ph.CO

Weak Lensing with SKAO: Cosmic Shear Cosmology

Ian Harrison , Roberto Ingrao , Stefano Camera , Catherine Cress , Mamta Pandey-Pommier , Ziad Sakr , Cora Uhlemann This is my paper

Pith reviewed 2026-06-25 20:42 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords weak lensingcosmic shearSKAOS8 parameterradio galaxiescosmological constraintsintrinsic alignmentscross-correlation
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The pith

SKAO radio surveys can measure the S8 structure formation parameter to 5% precision alone and 3% when combined with optical surveys.

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

The paper forecasts how weak gravitational lensing surveys with the SKAO Mid telescope can constrain cosmological parameters using shapes of high-redshift star-forming galaxies. It reviews radio cosmic shear progress and presents predictions for the AA4 configuration in Band 2, both standalone and cross-correlated with LSST or Euclid. Under the assumption of high-fidelity shape reconstruction, SKAO reaches 5% precision on S8 by itself and tightens to 3% in joint analyses. Radio data supplies polarization and kinematic measurements that separate lensing signals from intrinsic galaxy alignments and can multiply statistical power by factors of 5 to 10. These capabilities offer a robustness check on optical weak lensing results through their distinct instrumental and astrophysical systematics.

Core claim

Surveys with the AA4 configuration of the SKAO will measure the growth of structure on large scales through the weak gravitational lensing effect on the shapes of resolved high-redshift star-forming galaxies in Band 2, delivering 5% constraints on the S8 parameter alone and 3% in full combination with either LSST or Euclid, while radio polarization and kinematics enable cleaner separation of lensing from intrinsic shapes.

What carries the argument

Cosmic shear measured from weak gravitational lensing distortions to the shapes of radio star-forming galaxies, with polarization and kinematics used to isolate the lensing signal.

If this is right

  • SKAO measurements supply an independent test of optical weak lensing results because they respond differently to instrumental and astrophysical systematics.
  • Polarization and kinematic data allow separation of lensing from intrinsic alignments, increasing statistical power by factors of approximately 5 to 10.
  • Joint analyses with LSST or Euclid tighten S8 constraints to 3% while cross-checking robustness.
  • Radio surveys add unique information on galaxy samples that can refine models of star-forming populations at high redshift.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Successful radio shape measurements could extend weak lensing constraints to redshift ranges where optical surveys lose sensitivity.
  • The distinct radio systematics might help isolate whether current S8 tensions arise from astrophysical effects common to optical data.
  • Polarization-based intrinsic alignment removal could become a standard technique for reducing one of the dominant uncertainties in future lensing surveys.

Load-bearing premise

High-fidelity reconstruction of galaxy shapes from the radio observations is possible.

What would settle it

An end-to-end simulation or early SKAO data analysis showing that shape measurement errors exceed the level needed to reach the forecasted 5% precision on S8 would falsify the central claim.

Figures

Figures reproduced from arXiv: 2606.25583 by Catherine Cress, Cora Uhlemann, Ian Harrison, Mamta Pandey-Pommier, Roberto Ingrao, Stefano Camera, Ziad Sakr.

Figure 1
Figure 1. Figure 1: Sky number density of resolved galaxies in an SKA-Mid continuum survey, as a function of integration depth. In order to detect the cosmic shear signal a density of 1 gal/arcmin−2 is required. Though this is easily achieved with AA4 it is unachievable with AA* no matter the noise level reached. Moving the fixed number of AA* dishes to create longer 75 km baselines recovers the ability to achieve the thresho… view at source ↗
Figure 2
Figure 2. Figure 2: The constraining power on 𝑆8 parameters from the cosmic shear surveys described in the text. Dashed blue is that for the SKA-Mid AA4 survey auto-correlations, solid red for the OIV optical/nIR Stage-IV survey auto-correlations, dash-dotted green represents their cross-correlation (which will remove additive systematics by construction), and filled contours show the combination of the two auto- plus one cro… view at source ↗
read the original abstract

We discuss the power of weak gravitational lensing surveys with the SKAO in constraining cosmological parameters and the properties of radio star-forming galaxy samples. As well as reviewing progress to date on cosmic shear in radio experiments, we show forecasts for parameter constraints using the Mid telescope both alone and in cross-correlation with contemporaneous optical surveys. By selecting a sample of resolved, high-redshift star-forming galaxies in Band 2, surveys with the AA4 configuration will be capable of measuring the growth of structure on large scales in the Universe through the effect of weak gravitational lensing on their shapes. Assuming the high fidelity reconstruction of such galaxy shapes to be possible, we find that SKAO will measure the $S_8$ structure formation parameter to a level of $5\%$ alone and $3\%$ in full combination with either LSST or the \emph{Euclid} satellite. These measurements will be highly important due to their radically different sensitivities to key weak lensing systematics, both instrumental and astrophysical, and as such provide a vital robustness test to a pillar of modern cosmological measurements. Radio surveys also provide unique and potentially game-changing information in the form of polarisation and galaxy kinematics, which allow the cleaner separation of lensing from intrinsic galaxy shapes and can increase statistical power by factors $\sim5$-$10$.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript forecasts the cosmological constraining power of weak gravitational lensing (cosmic shear) measurements with the SKA Observatory Mid telescope. By selecting resolved high-redshift star-forming galaxies in Band 2 under the AA4 configuration, and assuming high-fidelity shape reconstruction is possible, it predicts that SKAO alone will constrain the structure-growth parameter S8 to 5% precision and to 3% when combined with LSST or Euclid. The work reviews prior radio weak-lensing efforts, emphasizes the orthogonal systematics relative to optical surveys, and highlights the potential of polarization and kinematic information to separate lensing from intrinsic alignments, increasing statistical power by factors of ~5-10.

Significance. If the forecasts are realized, the results would supply an independent radio-based probe of structure growth whose instrumental and astrophysical systematics differ markedly from those of LSST and Euclid, thereby providing a valuable robustness test for weak-lensing cosmology. The explicit incorporation of radio-specific observables (polarization, kinematics) is a distinctive strength that could materially improve intrinsic-alignment mitigation.

minor comments (2)
  1. Abstract: the quantitative forecasts (5% and 3% on S8) are presented without reference to the specific Fisher-matrix or simulation pipeline used to obtain them; a brief pointer to the relevant section or equation would improve traceability.
  2. Abstract, final sentence: the factor '~5-10' gain from polarization/kinematics is stated without an accompanying citation or derivation; adding a reference to the calculation would strengthen the claim.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive summary, recognition of the work's significance, and recommendation for minor revision. No major comments were raised in the report.

Circularity Check

0 steps flagged

No significant circularity; forecasts are conditional projections

full rationale

The paper presents standard cosmological forecasts for SKAO weak lensing surveys under an explicit upfront assumption of high-fidelity galaxy shape reconstruction. No derivation chain, equations, or self-citations are exhibited in the provided text that reduce any claimed prediction (e.g., 5% or 3% S8 precision) to fitted inputs or prior results by construction. The central results are framed as conditional projections with orthogonal systematics, not as first-principles derivations equivalent to their inputs. This is the normal case for forecast papers and scores as self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no explicit free parameters, axioms, or invented entities are stated beyond the shape-reconstruction assumption.

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discussion (0)

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Reference graph

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