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arxiv: 2512.16992 · v2 · submitted 2025-12-18 · 🌌 astro-ph.CO

The imprints of massive neutrinos on the three-point correlation function of large-scale structures

Pith reviewed 2026-05-16 20:57 UTC · model grok-4.3

classification 🌌 astro-ph.CO
keywords massive neutrinosthree-point correlation functionlarge-scale structuresigma_8 degeneracyhalo clusteringN-body simulations
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The pith

The three-point correlation function shows distinct massive-neutrino signals on elongated and right-angled triangles that differ from sigma_8 variations.

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

This paper measures the isotropic connected three-point correlation function ζ and the reduced three-point correlation function Q in halo catalogs from N-body simulations with neutrino masses of 0.0, 0.1, 0.2, and 0.4 eV. It identifies the strongest effects in quasi-isosceles and squeezed triangles, with elongated triangles most sensitive in ζ and right-angled triangles providing complementary signal in Q. These patterns grow stronger at lower redshifts and look markedly different from the changes produced by varying sigma_8 instead of neutrino mass. The distinction suggests the three-point correlation function can break the well-known degeneracy between the two parameters, with potential application to stage-IV spectroscopic surveys.

Core claim

Measurements of ζ and Q on halo catalogs from the Quijote simulations reveal that neutrino free-streaming produces its strongest signal in quasi-isosceles and squeezed triangles, increasing toward lower redshifts. Elongated triangles are most affected in ζ while right-angled triangles supply a complementary source in Q. Direct comparison with simulations that vary sigma_8 without neutrinos shows these signatures are significantly different, indicating that the three-point correlation function can break the M_ν–σ_8 degeneracy.

What carries the argument

The isotropic connected three-point correlation function ζ and reduced three-point correlation function Q evaluated on different triangle shapes in simulated halo distributions.

If this is right

  • Elongated triangles in ζ become the primary probe for isolating neutrino-mass effects in future galaxy surveys.
  • Right-angled triangles in Q supply an independent channel less entangled with sigma_8.
  • The neutrino signal strengthens at lower redshifts, favoring lower-redshift bins in survey analyses.
  • The triangle-shape framework can be applied directly to data from DESI, Euclid, 4MOST, and the Roman Space Telescope.

Where Pith is reading between the lines

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

  • The same shape-dependent analysis could be extended to other degenerate parameter pairs in large-scale structure studies.
  • Combining three-point correlation function measurements with two-point statistics may tighten neutrino-mass bounds beyond what either probe achieves separately.
  • Real survey data will ultimately test whether the simulated differences persist once observational systematics are included.

Load-bearing premise

The Quijote N-body simulations accurately capture the free-streaming effects of massive neutrinos on halo clustering without significant contamination from resolution limits or other modeling choices.

What would settle it

If measurements from a stage-IV spectroscopic survey find that the three-point correlation function differences on elongated triangles in ζ and right-angled triangles in Q match those produced by sigma_8 variations alone, the claim that the 3PCF breaks the degeneracy would be falsified.

Figures

Figures reproduced from arXiv: 2512.16992 by Alfonso Veropalumbo, Andrea Labate, Massimo Guidi, Michele Moresco.

Figure 1
Figure 1. Figure 1: The values of the parameter ˜χ 2 (s12, s13) defined in Eq. 10, for the single-scale connected 3PCF, obtained for Mν = 0.4 eV. Each panel corresponds to a different redshift: from left to right, z = 0, 1, and 2. The lines overplotted on the left panel are taken as representative of regions of enhanced signal, and identify isosceles triangles (black dashed line with η = 0, where the signal is enhanced only o… view at source ↗
Figure 2
Figure 2. Figure 2: Single-scale connected 3PCF for the triangle configurations selected in [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Detectability matrices of massive neutrinos. Each matrix element shows the scale scross (Eq. 13) below which, considering all triangles with scale larger than scross, we get a significant detection of the signal from massive neutrinos in the connected 3PCF. The matrices in the upper and lower rows show the values for a 1σ and 3σ statistical significance (Eq. 12), respectively, computed for a volume of 10 h… view at source ↗
Figure 4
Figure 4. Figure 4: The detectability of the halo connected 3PCF (upper panels) and reduced 3PCF (lower panels) as a function of the triangle shape. Here, the results are reported at z = 0 and for Mν = 0.4 eV. The triangle shapes are determined by the side ratios s12/s23 and s13/s23, with s12 ≤ s13 ≤ s23. In each panel, each pixel represents a given triangle shape, where the color shows the absolute value of the detectability… view at source ↗
Figure 5
Figure 5. Figure 5: Comparison between the detectability of a variation in Mν and σ8 from the halo 3PCF as a function of triangle shape. We show the results for the simulations at z = 0 with Mν = 0.1 eV and fiducial σ8 = 0.834 (red-scale colormaps), and with Mν = 0 eV and σ8 = 0.849 (upper blue-scale colormap) and σ8 = 0.819 (lower blue-scale colormap). The top and bottom pairs of plots refer to the connected and reduced 3PCF… view at source ↗
read the original abstract

Free-streaming of cosmic neutrinos affects the distribution and growth of cosmic structures on small scales. This enables the sum of neutrino masses $M_\nu$ to be constrained from clustering studies. We investigate the possibility of disentangling massive neutrino cosmologies with the three-point correlation function (3PCF) for the first time. We measured the isotropic connected 3PCF $\zeta$ and the reduced 3PCF $Q$ of halo catalogs from the Quijote suite of $N$-body simulations, considering $M_\nu =0.0, 0.1, 0.2,$ and $0.4 \, \mathrm{eV}$ in different redshift bins. We developed a framework to quantify the detectability of massive neutrinos for different triangle configurations and shapes, and applied it to a case compatible with a stage-IV spectroscopic survey. We also compared our results with the analysis of simulations without neutrinos, but with different $\sigma_8$ values, to test whether the 3PCF can break the well-known degeneracy between the two parameters. We found that as a result of free-streaming, the strongest signal is found for quasi-isosceles and squeezed triangles; this signal increases for decreasing redshifts. Among these configurations, elongated triangles, tracing the filamentary structure of the cosmic web, are the most affected by massive neutrinos, with a 3PCF signal increasing with $M_\nu$. A complementary source of signal comes from right-angled triangles in $Q$. Importantly, we found that the signatures of a $\sigma_8$ variation appear to be significantly different on elongated triangles in $\zeta$ and right-angled triangles in $Q$, suggesting that the 3PCF can be used to effectively break the $M_\nu - \sigma_8$ degeneracy. These results open the possibility to use the 3PCF as a powerful complementary tool for constraining neutrino masses in current and future spectroscopic surveys such as DESI, Euclid, 4MOST, and the Nancy Grace Roman Space Telescope.

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 manuscript claims that measurements of the isotropic connected three-point correlation function ζ and reduced three-point correlation function Q from halo catalogs in the Quijote N-body suite (M_ν = 0.0, 0.1, 0.2, 0.4 eV) show the strongest neutrino free-streaming signals on quasi-isosceles, squeezed, and elongated triangles in ζ and right-angled triangles in Q. These signatures differ from those produced by σ8 variations, enabling the 3PCF to break the M_ν-σ8 degeneracy. A detectability framework is developed and applied to a stage-IV spectroscopic survey case, with signals strengthening toward lower redshifts.

Significance. If the central results hold, the work would be significant for large-scale structure cosmology by identifying specific 3PCF triangle configurations that respond differently to neutrino free-streaming than to σ8, offering a practical complement to two-point statistics for neutrino mass constraints in surveys such as DESI, Euclid, and Roman. The use of the public Quijote suite with direct triangle counting across multiple masses and redshifts, plus the explicit detectability framework, provides a reproducible foundation for follow-up analyses.

major comments (1)
  1. The degeneracy-breaking claim (abstract) requires that differences in elongated triangles for ζ and right-angled triangles for Q between the M_ν runs and the σ8-varied runs arise purely from neutrino free-streaming. The Quijote setup deploys 512^3 CDM particles in 1 Gpc/h volumes with neutrinos as additional particles; for M_ν = 0.1–0.4 eV the free-streaming wavenumber lies near the resolution limit, where neutrino shot noise and force softening can alter small-scale halo clustering. No convergence tests of the 3PCF versus particle number or neutrino assignment scheme are referenced, so numerical artifacts would not cancel in the σ8 comparison and could mimic the reported distinct signatures.
minor comments (2)
  1. The abstract mentions both 'quasi-isosceles and squeezed triangles' and 'elongated triangles' as most affected; a short explicit statement of how these shape classes relate (e.g., via opening-angle or side-length ratios) would improve clarity.
  2. Details on covariance estimation, triangle binning, and error-bar construction for the detectability framework should be expanded in the methods section to allow full reproducibility of the stage-IV forecast.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their thorough review and valuable feedback on our manuscript. We have carefully considered the major comment and provide our response below, along with plans for revision.

read point-by-point responses
  1. Referee: The degeneracy-breaking claim (abstract) requires that differences in elongated triangles for ζ and right-angled triangles for Q between the M_ν runs and the σ8-varied runs arise purely from neutrino free-streaming. The Quijote setup deploys 512^3 CDM particles in 1 Gpc/h volumes with neutrinos as additional particles; for M_ν = 0.1–0.4 eV the free-streaming wavenumber lies near the resolution limit, where neutrino shot noise and force softening can alter small-scale halo clustering. No convergence tests of the 3PCF versus particle number or neutrino assignment scheme are referenced, so numerical artifacts would not cancel in the σ8 comparison and could mimic the reported distinct signatures.

    Authors: We appreciate the referee pointing out the potential for numerical artifacts in the neutrino simulations. The Quijote suite uses 512^3 CDM particles and additional neutrino particles, and while the free-streaming scales for the considered M_ν values are indeed near the resolution limit, our measurements focus on triangle configurations where the signal is dominated by large-scale modes less affected by small-scale noise. The σ8-varied simulations share the same CDM resolution, facilitating a fair comparison of the shape-dependent responses. However, we agree that explicit convergence tests for the 3PCF are necessary to fully substantiate the claims. In the revised manuscript, we will add a dedicated section presenting convergence checks, including comparisons with available higher-resolution Quijote runs and assessments of neutrino particle loading effects, to confirm that the distinct signatures in elongated triangles for ζ and right-angled triangles for Q are physical and not artifacts. This will strengthen the degeneracy-breaking argument. revision: yes

Circularity Check

0 steps flagged

No circularity: results obtained via direct counting in N-body catalogs

full rationale

The paper reports measurements of the isotropic connected 3PCF ζ and reduced 3PCF Q extracted by direct enumeration of triangle configurations in halo catalogs drawn from the Quijote N-body suite. No analytic derivation, fitted functional form, or self-citation chain is invoked to obtain the reported signals on elongated or right-angled triangles; the differences between M_ν and σ_8 runs are presented as numerical outcomes of the simulation measurements themselves. The framework for detectability is likewise a post-processing quantification applied to those counts. Because the central claims rest on external simulation data rather than on any equation that reduces to its own inputs by construction, the derivation chain contains no circular steps.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the assumption that N-body simulations correctly model neutrino free-streaming and that the chosen triangle statistics capture the relevant physics without additional free parameters beyond the input neutrino masses.

free parameters (1)
  • M_nu simulation values
    Discrete neutrino mass sums (0.0, 0.1, 0.2, 0.4 eV) are chosen as input parameters for the simulation suite rather than derived.
axioms (1)
  • domain assumption Quijote N-body simulations accurately reproduce the effects of neutrino free-streaming on halo clustering
    Invoked when interpreting differences in zeta and Q as direct imprints of M_nu

pith-pipeline@v0.9.0 · 5692 in / 1366 out tokens · 25919 ms · 2026-05-16T20:57:42.604611+00:00 · methodology

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Reference graph

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