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arxiv: 2604.21099 · v1 · submitted 2026-04-22 · ✦ hep-ph · astro-ph.HE· hep-th

Ultra High Energy Cosmic Rays from the Local Void

Michael J. Padgett , Thomas W. Kephart This is my paper

Pith reviewed 2026-05-09 23:19 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.HEhep-th
keywords ultra high energy cosmic raysmagnetic monopoleslocal voidcosmic ray originsparticle astrophysicsdirectional analysis
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The pith

Ultra-high-energy cosmic rays arriving from the local void are light magnetic monopoles.

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

The paper uses the observed arrival directions of ultra-high-energy cosmic rays from the local cosmic void—an empty region without conventional sources—to argue that at least some of these particles must be relatively light magnetic monopoles. If true, this would resolve the puzzle of how such energetic particles reach Earth from directions lacking accelerators or matter. The authors further claim that full-sky observations can determine the relative fraction of these monopoles among events above 10^20 eV.

Core claim

The central claim is that the directionality of ultra-high-energy cosmic rays from the local void implies at least some are light magnetic monopoles, whose relative abundance above 10^20 eV is measurable through complete sky surveys.

What carries the argument

Arrival direction from the local void, used as direct evidence that standard hadrons or nuclei could not reach us without sources, while light monopoles can.

If this is right

  • Standard acceleration mechanisms in dense regions would not explain these particular events.
  • The monopole fraction can be extracted statistically from directional data alone.
  • This changes the expected composition of the highest-energy cosmic rays.
  • It opens a window to monopole properties without laboratory production.

Where Pith is reading between the lines

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

  • If monopoles dominate at the highest energies, searches for other new particles in cosmic rays could be reinterpreted.
  • Propagation models for charged particles through intergalactic fields would need revision for monopole cases.
  • Future observatories could test this by correlating arrival directions with void boundaries.

Load-bearing premise

That rays appearing to come from the void must be monopoles rather than ordinary particles whose paths were bent or whose sources were misidentified due to propagation effects.

What would settle it

Full-sky maps showing no excess of events above 10^20 eV from the void direction, or direct detection of monopole-specific signatures like magnetic charge in those events.

Figures

Figures reproduced from arXiv: 2604.21099 by Michael J. Padgett, Thomas W. Kephart.

Figure 1
Figure 1. Figure 1: Hillas plot for a proton (934 EeV) and Fe nucleus (240 EeV). Known acceleration sources are [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Average of random walks for 20 MMs in the local group with [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: 720 cosmic rays above the GZK limit from PAO and AGASA (including the Fly’s Eye ( 320 EeV) [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Trans-GZK void rays broken down by their reconstructed energy on arrival. The Amaterasu [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Void-Nonvoid ratio and MM fraction of UHECRs [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
read the original abstract

Ultra high energy cosmic rays have been see coming from the direction of the local cosmic void. We use this fact to argue that at least some of these these cosmic rays are relatively light magnetic monopoles and that their relative fraction above 1020 eV can be found from full sky observations.

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

2 major / 2 minor

Summary. The manuscript claims that the observed arrival directions of ultra-high-energy cosmic rays (UHECRs) from the local cosmic void imply that at least some of these particles must be relatively light magnetic monopoles, and that the relative fraction of such monopoles above 10^{20} eV can be determined from full-sky observations.

Significance. If the central interpretive claim were supported by explicit calculations excluding standard UHECR propagation, the result would be highly significant: it would introduce light magnetic monopoles as a viable UHECR constituent, potentially resolving the origin problem above the GZK cutoff and providing a falsifiable prediction for directional anisotropy.

major comments (2)
  1. The manuscript: The inference that directions from the local void require light magnetic monopoles is presented without any supporting calculation. No estimate is given of the GZK attenuation length for protons or nuclei above 10^{20} eV, no deflection angles in galactic/extragalactic magnetic fields are computed, and no modeling of expected source distributions or isotropic background from outside the void is shown. This step is load-bearing for the particle-identity assignment.
  2. The manuscript: No derivation or quantitative procedure is supplied for extracting the monopole fraction above 10^{20} eV from full-sky data. The claim that this fraction 'can be found' remains an assertion without an explicit method, observable, or statistical framework.
minor comments (2)
  1. [Abstract] Abstract: 'have been see' is a typographical error and should read 'have been seen'.
  2. [Abstract] Abstract: Duplicate word 'these these' should be corrected to 'these'.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed and constructive report. Our manuscript is a brief conceptual note rather than a comprehensive calculation paper. We address each major comment below and indicate where revisions will be made.

read point-by-point responses

  1. Referee: The manuscript: The inference that directions from the local void require light magnetic monopoles is presented without any supporting calculation. No estimate is given of the GZK attenuation length for protons or nuclei above 10^{20} eV, no deflection angles in galactic/extragalactic magnetic fields are computed, and no modeling of expected source distributions or isotropic background from outside the void is shown. This step is load-bearing for the particle-identity assignment.

    Authors: We agree that the original text is concise and relies on the well-established GZK cutoff without repeating the standard numbers. Protons and nuclei above 10^{20} eV have attenuation lengths of order 50-100 Mpc due to photopion production, while the local void is largely empty of sources on those scales. Light monopoles would not experience the same energy-loss channels. To make the argument self-contained we will add a short paragraph with the accepted GZK length scale, a reference to the literature, and a qualitative note on why magnetic deflections do not alter the directional conclusion for the monopole hypothesis. revision: yes

  2. Referee: The manuscript: No derivation or quantitative procedure is supplied for extracting the monopole fraction above 10^{20} eV from full-sky data. The claim that this fraction 'can be found' remains an assertion without an explicit method, observable, or statistical framework.

    Authors: The manuscript states only that the fraction is in principle measurable; it does not claim to have performed the measurement. With full-sky coverage the directional distribution relative to the void can be compared to the expected suppression for hadronic primaries. We will insert a brief outline of how a two-component fit (attenuated hadronic background plus unattenuated monopole component) could be applied to the observed sky map, including the relevant observable (excess or deficit in the void direction). revision: yes

Circularity Check

0 steps flagged

No circularity; observational inference without self-referential derivation or fitted predictions

full rationale

The paper's central step uses the observed arrival directions of UHECRs from the local void to infer that at least some are light magnetic monopoles, with the relative fraction above 10^20 eV to be determined from full-sky data. This is presented as an argument from observation rather than a mathematical derivation chain. No equations, fitted parameters renamed as predictions, self-citations, or ansatzes are invoked in a load-bearing way that reduces the result to its inputs by construction. The fraction is explicitly to be extracted from future observations, not derived internally, so the claim remains an interpretive inference rather than a circular prediction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

The claim depends on the unproven link between arrival direction and monopole identity, with no free parameters or invented entities quantified in the abstract.

axioms (1)
  • domain assumption UHECRs arriving from the local void direction must be light magnetic monopoles because ordinary particles cannot originate or propagate from there.
    This assumption is required to convert the directional observation into a particle-type claim.
invented entities (1)
  • light magnetic monopoles as UHECR constituents no independent evidence
    purpose: To explain the source of UHECRs observed from the local void
    Postulated to account for the directional data; no independent evidence or falsifiable prediction (such as specific mass or flux) is given in the abstract.

pith-pipeline@v0.9.0 · 5332 in / 1201 out tokens · 78684 ms · 2026-05-09T23:19:48.952525+00:00 · methodology

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Reference graph

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