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arxiv: 2604.02604 · v1 · submitted 2026-04-03 · ✦ hep-ph

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· Lean Theorem

Probing Freeze-In Dark Matter via a Spin-2 Portal at the LHC with Vector Boson Fusion and Machine Learning

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Pith reviewed 2026-05-13 19:08 UTC · model grok-4.3

classification ✦ hep-ph
keywords freeze-in dark matterspin-2 portalvector boson fusionmachine learningLHC phenomenologygraviton mediatordark sector
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The pith

Searches at the high-luminosity LHC using vector boson fusion and machine learning can test substantial regions of the cosmologically viable freeze-in dark matter parameter space via a spin-2 portal.

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

The paper examines how feebly interacting dark matter produced through the freeze-in mechanism in the early universe can leave detectable traces at the LHC when mediated by a massive spin-2 particle. It connects the cosmological conditions that yield the observed relic abundance to specific collider signatures in bosonic fusion channels, where the mediator decays invisibly. Machine-learning techniques are applied to improve sensitivity in the regime of very weak couplings. A sympathetic reader would care because this approach offers a concrete way to probe dark sectors motivated by extra-dimensional gravity models that are otherwise difficult to access through direct detection or other traditional searches.

Core claim

In a framework where a massive graviton-like mediator couples minimally and universally to the energy-momentum tensor of both the Standard Model and the dark sector, the freeze-in mechanism produces the observed dark matter relic density in parameter regions that remain testable at the LHC. Focusing on vector boson fusion production and invisible mediator decays, the analysis shows that machine-learning-enhanced searches at the high-luminosity LHC can probe substantial portions of this cosmologically allowed space.

What carries the argument

The spin-2 portal realized by a massive graviton-like mediator that couples minimally and universally to the energy-momentum tensor of the Standard Model and dark sector fields.

If this is right

  • Regions of parameter space consistent with the observed dark matter relic abundance become testable through invisible decay signatures.
  • Bosonic fusion production channels provide enhanced sensitivity to the spin-2 interactions.
  • Machine learning algorithms improve reach in the feeble-coupling regime.
  • The high-luminosity LHC functions as a laboratory for feebly interacting dark sectors.
  • This establishes a complementary collider pathway to test freeze-in dark matter via gravitationally motivated portals.

Where Pith is reading between the lines

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

  • Confirmation would link extra-dimensional gravity constructions to observable high-energy signals.
  • Similar invisible-decay searches could be adapted to other feebly interacting mediator models.
  • Refinements in machine-learning classifiers might further extend sensitivity to lower coupling values.
  • Cross-checks with cosmological observables could tighten bounds on mediator mass and coupling strength.

Load-bearing premise

The massive graviton-like mediator couples minimally and universally to the energy-momentum tensor of both the Standard Model and the dark sector, allowing freeze-in to generate the observed relic abundance in collider-accessible regions.

What would settle it

Absence of the predicted excess of invisible vector boson fusion events in high-luminosity LHC data at the projected sensitivity would exclude the accessible freeze-in parameter space for this spin-2 mediator model.

Figures

Figures reproduced from arXiv: 2604.02604 by Alfredo Gurrola, Junzhe Liu.

Figure 1
Figure 1. Figure 1: FIG. 1. Ratio of decay width to spin-2 mediator mass for dark matter masses of [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Theoretical constraints on the mediator couplings to dark matter and photons, derived from resonant and off-resonant [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Representative Feynman diagrams of [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Representative Feynman diagram of [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Dijet transverse momentum distributions for [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Missing transverse energy distributions for [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Pseudorapidity separation between the two jets for [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Transverse momentum distributions for the leading [PITH_FULL_IMAGE:figures/full_fig_p009_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Relative importance of features in training for a [PITH_FULL_IMAGE:figures/full_fig_p010_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. BDT output distributions for a benchmark with [PITH_FULL_IMAGE:figures/full_fig_p010_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Projected 95% CL upper limits on the production [PITH_FULL_IMAGE:figures/full_fig_p011_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12. Projected constraints on the effective couplings Λ [PITH_FULL_IMAGE:figures/full_fig_p012_12.png] view at source ↗
read the original abstract

The persistent absence of signals in traditional dark matter searches has intensified interest in scenarios beyond the canonical weakly interacting massive particle paradigm. In this work, we investigate the collider phenomenology of feebly interacting dark matter produced via the freeze-in mechanism through a spin-2 portal. We consider a framework in which a massive graviton-like mediator couples minimally and universally to the energy--momentum tensor of both the Standard Model (SM) and the dark sector. Such interactions arise naturally in extra-dimensional constructions and effective theories of gravity, providing a theoretically well-motivated and predictive setup. We systematically connect early-Universe cosmology with collider observables by identifying regions of parameter space consistent with freeze-in conditions and the observed dark matter relic abundance, and examining their testability at the Large Hadron Collider (LHC). Focusing on bosonic fusion production channels, which are particularly sensitive to spin-2 interactions, we analyze invisible mediator decay signatures and assess current and projected experimental sensitivities. To enhance sensitivity in this challenging regime of feeble couplings, we develop a search strategy based on machine-learning algorithms. Our results demonstrate that collider searches can probe substantial regions of the cosmologically viable freeze-in parameter space, highlighting the high-luminosity LHC as a powerful laboratory for feebly interacting dark sectors. This study establishes a concrete and complementary pathway to test freeze-in dark matter scenarios through spin-2 portals, thereby bridging gravitationally motivated new physics, cosmology, and high-energy collider experiments.

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 / 1 minor

Summary. The manuscript investigates freeze-in dark matter produced via a massive spin-2 (graviton-like) mediator that couples minimally and universally to the energy-momentum tensor of both the Standard Model and the dark sector. It maps cosmologically viable parameter regions (consistent with the observed relic abundance) to LHC signatures in vector boson fusion production channels with invisible mediator decays, and develops a machine-learning-enhanced search strategy to assess sensitivity at the high-luminosity LHC.

Significance. If the results hold, the work provides a concrete, theoretically motivated bridge between extra-dimensional/effective-gravity constructions, early-Universe freeze-in cosmology, and collider observables. The explicit linkage of relic-density calculations to VBF cross sections and invisible-decay signatures, together with the use of ML for sensitivity in the feeble-coupling regime, is a strength; the setup is standard and internally consistent with no evident higher-dimensional operator issues or unjustified extrapolations.

minor comments (1)
  1. [Abstract] Abstract: the claim that 'substantial regions of the cosmologically viable freeze-in parameter space' can be probed is stated without quantitative details (e.g., projected exclusion contours, fraction of parameter space, or ML performance metrics such as AUC or background rejection), which weakens the impact of the summary.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of our manuscript and for recommending minor revision. The referee's summary correctly identifies the core elements of our work: the spin-2 portal for freeze-in dark matter, the mapping of cosmologically viable parameter space to VBF signatures with invisible decays, and the ML-enhanced search strategy at the HL-LHC. We appreciate the recognition that the setup is theoretically consistent and provides a concrete link between extra-dimensional constructions, early-Universe cosmology, and collider observables.

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper's central mapping from freeze-in relic density to LHC observables proceeds via explicit effective-theory calculations of production cross sections, invisible decays, and parameter-space regions consistent with the observed abundance. No self-definitional reductions, fitted inputs renamed as predictions, or load-bearing self-citations appear; the minimal universal coupling to the energy-momentum tensor is an external assumption whose consequences are computed independently rather than presupposed. The derivation remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 1 invented entities

The central claim rests on the existence and coupling properties of the spin-2 mediator and the validity of the freeze-in calculation for the relic density; these are introduced as theoretically motivated but not independently verified in the provided abstract.

free parameters (1)
  • mediator mass and coupling strength
    These parameters are scanned to identify regions consistent with both freeze-in relic density and LHC sensitivity.
axioms (1)
  • domain assumption The massive graviton-like mediator couples minimally and universally to the energy-momentum tensor of the SM and dark sector.
    This is the defining framework stated in the abstract.
invented entities (1)
  • massive graviton-like mediator no independent evidence
    purpose: To serve as the portal for freeze-in production of dark matter.
    Postulated in the effective theory; no independent evidence provided in abstract.

pith-pipeline@v0.9.0 · 5564 in / 1376 out tokens · 49877 ms · 2026-05-13T19:08:32.483268+00:00 · methodology

discussion (0)

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Direct-detection constraints on inelastic dark matter with a scalar mediator

    hep-ph 2026-04 unverdicted novelty 5.0

    Xenon data constrain inelastic fermion DM with scalar mediator for sub-MeV mass splittings through endothermic and exothermic DM-electron scattering.

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