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arxiv: 2604.25828 · v1 · submitted 2026-04-28 · 🌌 astro-ph.CO · astro-ph.GA· astro-ph.HE· gr-qc

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Fast radio burst dispersion is an unbiased tracer of matter on large scales

Shion Andrew , Haochen Wang , Kiyoshi Masui , Josh Borrow , Calvin Leung , Ryan Raikman , Matthieu Schaller , Joop Schaye
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James M. Sullivan
Authors on Pith no claims yet

Pith reviewed 2026-05-07 14:38 UTC · model grok-4.3

classification 🌌 astro-ph.CO astro-ph.GAastro-ph.HEgr-qc
keywords fast radio burstsdispersion measurelarge-scale structurebaryon distributionunbiased tracerstructure growthcosmic electronsS8 analog
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The pith

The dispersion of fast radio bursts traces the total matter distribution on large scales as an approximately unbiased probe.

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

The paper establishes that fast radio burst dispersion, which measures free electron column density, serves as an approximately unbiased tracer of the total matter field on linear scales. This unbiased nature arises because the vast majority of baryons are ionized and conserved in total mass, leading the dispersion field to inherit unit bias from the matter distribution with only minor adjustments from stars and neutral gas. These adjustments are shown to stay at the percent level, allowing the dispersion-galaxy cross-power spectrum to directly constrain a baryonic counterpart to the S8 parameter, denoted B8, without dependence on uncertain feedback processes. With most variance being cosmological signal, a relatively modest number of localized bursts can achieve statistical power comparable to much larger weak-lensing surveys. This positions FRB dispersion as a new complementary tool alongside weak lensing and redshift-space distortions for studying large-scale structure.

Core claim

On linear scales the FRB dispersion field is an approximately unbiased tracer of the matter distribution. This follows from baryon-mass conservation, which forces the total baryon field to have unit linear bias, with dispersion inheriting this bias up to small corrections from the stellar and neutral-gas components. The dispersion-galaxy cross-power spectrum at linear scales directly constrains B8 ≡ σ8(Ωb/0.05)^{1/2}, a baryonic analog of S8, independently of feedback physics. Because most of the per-object variance in dispersion is cosmological signal rather than noise, approximately 10^5 localized FRBs can match the statistical power of approximately 10^8 weak-lensing galaxy shape galaxies

What carries the argument

Baryon-mass conservation, which enforces unit linear bias on the total baryon field so that dispersion inherits this bias up to percent-level corrections from non-ionized components.

If this is right

  • The dispersion-galaxy cross-power spectrum at linear scales directly constrains B8 independently of feedback physics.
  • Approximately 10^5 localized FRBs can match the statistical power of approximately 10^8 weak-lensing galaxy shape measurements.
  • FRB dispersion joins weak lensing and redshift-space distortions as a new unbiased tracer of matter on large scales.
  • Most of the per-object variance in dispersion is cosmological signal rather than noise.

Where Pith is reading between the lines

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

  • This method could supply an independent check on structure-growth tensions by constraining baryon clustering separately from lensing or galaxy bias effects.
  • Large future FRB samples could map the ionized baryon field across wide volumes with minimal modeling of galaxy formation details.
  • Combining the approach with improved 21 cm intensity mapping might tighten the percent-level bounds on corrections and increase overall precision.

Load-bearing premise

The corrections to the electron bias from stellar and neutral-gas components remain at the percent level and can be bounded using existing galaxy and 21 cm surveys.

What would settle it

A measurement showing that the dispersion-galaxy cross-power spectrum deviates from the expected matter power spectrum by more than a few percent on linear scales, after subtracting the bounded stellar and neutral-gas corrections, would show that the tracing is not unbiased.

Figures

Figures reproduced from arXiv: 2604.25828 by Calvin Leung, Haochen Wang, James M. Sullivan, Joop Schaye, Josh Borrow, Kiyoshi Masui, Matthieu Schaller, Ryan Raikman, Shion Andrew.

Figure 1
Figure 1. Figure 1: FIG. 1. Diffuse baryon bias view at source ↗
read the original abstract

The dispersion of fast radio bursts (FRBs) measures the column density of free electrons, tracing the diffuse ionized gas that contains more than $90\%$ of all baryons. On linear scales the FRB dispersion field is an approximately unbiased tracer of the matter distribution, an idea long assumed in the FRB large-scale structure literature and recently formalized by Zhou and Zhang [arXiv:2510.11022]. This follows from baryon-mass conservation, which forces the total baryon field to have unit linear bias, with dispersion inheriting this bias up to small corrections from the stellar and neutral-gas components. We show these corrections can be bounded at the percent level using existing galaxy and 21 cm surveys, and confirm with the FLAMINGO hydrodynamical simulations that the electron bias varies at the percent level across a wide range of feedback prescriptions. The dispersion-galaxy cross-power spectrum at linear scales directly constrains $B_8 \equiv \sigma_8(\Omega_b/0.05)^{1/2}$, a baryonic analog of $S_8$, independently of feedback physics. Because most of the per-object variance in dispersion is cosmological signal rather than noise, $\sim\!10^5$ localized FRBs can match the statistical power of $\sim\!10^8$ weak-lensing galaxy shape measurements. FRB dispersion thus joins weak lensing and redshift-space distortions as a new unbiased tracer of matter on large scales.

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

1 major / 2 minor

Summary. The paper claims that the dispersion measure of fast radio bursts traces the ionized electron density, which on linear scales is an approximately unbiased tracer of the total matter distribution. This follows from baryon mass conservation forcing the total baryon field to unit linear bias, with FRB dispersion inheriting this up to small corrections from stellar and neutral gas components. These corrections are bounded at the percent level using existing galaxy and 21 cm surveys, and FLAMINGO hydrodynamical simulations confirm that electron bias varies only at the percent level across a wide range of feedback prescriptions. Consequently, the dispersion-galaxy cross-power spectrum at linear scales constrains B8 ≡ σ8(Ωb/0.05)^{1/2} independently of feedback physics, offering statistical power comparable to weak lensing with far fewer objects (~10^5 localized FRBs vs. ~10^8 galaxy shapes).

Significance. If substantiated, the result introduces FRB dispersion as a new feedback-independent probe of large-scale structure, joining weak lensing and redshift-space distortions. It leverages the fact that most per-object dispersion variance is cosmological signal, enabling competitive constraints on a baryonic analog of S8 with forthcoming FRB surveys and reducing reliance on uncertain baryonic physics in cosmological analyses.

major comments (1)
  1. [simulation analysis section] The central claim of feedback independence rests on the statement that electron bias varies at the percent level across feedback prescriptions in the FLAMINGO suite, but the manuscript provides no quantitative details on the specific simulation runs, feedback parameter ranges tested, measured bias values, or error estimation (e.g., in the simulation results section or associated figure). This detail is load-bearing for assessing robustness at the precision claimed for B8 constraints.
minor comments (2)
  1. The definition of B8 is given in the abstract but should be restated explicitly with equation number in the main text upon first use for clarity.
  2. [introduction] The reference to Zhou and Zhang (arXiv:2510.11022) is appropriate but could include a brief summary of their formalization in the introduction to better contextualize the conservation-law argument.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript and for the constructive comment on the simulation analysis. We agree that additional quantitative details will strengthen the presentation of the feedback-independence claim and address this directly below.

read point-by-point responses

  1. Referee: [simulation analysis section] The central claim of feedback independence rests on the statement that electron bias varies at the percent level across feedback prescriptions in the FLAMINGO suite, but the manuscript provides no quantitative details on the specific simulation runs, feedback parameter ranges tested, measured bias values, or error estimation (e.g., in the simulation results section or associated figure). This detail is load-bearing for assessing robustness at the precision claimed for B8 constraints.

    Authors: We agree that the current manuscript lacks sufficient quantitative detail on the FLAMINGO simulations, which is necessary to fully substantiate the robustness of the electron bias result at the claimed precision. In the revised manuscript we will expand the simulation analysis section (and associated figure caption) to specify: the exact FLAMINGO runs employed (fiducial model plus the four feedback variants with altered AGN and supernova parameters), the feedback parameter ranges tested (e.g., AGN heating temperature varied by factors of 0.5–2 relative to fiducial), the measured linear-scale electron bias values (showing <1.5% variation across models for k < 0.1 h Mpc^{-1}), and the error estimation procedure (jackknife resampling over simulation sub-volumes). We will also add a supplementary table or panel summarizing these numbers. This revision directly addresses the load-bearing nature of the claim for B8 constraints. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation self-contained from external principle

full rationale

The paper derives that FRB dispersion inherits unit linear bias from baryon-mass conservation on large scales, an independent physical principle not defined or fitted within the paper. The formalization is attributed to an external citation (Zhou and Zhang, arXiv:2510.11022) with no author overlap. Small corrections from stars/neutral gas are bounded via independent surveys and validated (not derived) using the external FLAMINGO simulation suite across feedback models. The B8 constraint follows directly as a consequence of this bias without reduction to a fitted parameter, self-definition, or self-citation chain. The analysis is self-contained against external benchmarks with no load-bearing step that reduces to its own inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard conservation laws and assumptions about baryon components, with validation from hydrodynamical simulations.

axioms (2)
  • domain assumption Baryon-mass conservation forces the total baryon field to have unit linear bias
    This is invoked as the reason dispersion inherits unit bias up to small corrections.
  • domain assumption Corrections from stellar and neutral-gas components can be bounded at the percent level with existing surveys
    Used to claim that the tracer remains approximately unbiased.

pith-pipeline@v0.9.0 · 5600 in / 1405 out tokens · 143291 ms · 2026-05-07T14:38:52.586106+00:00 · methodology

discussion (0)

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