Public engagement as a scientific tool to implement multi-messenger strategies with the Cosmic-Ray Extremely Distributed Observatory

Alan R. Duffy; Alona Mozgova; Bohdan Hnatyk; Dariusz G\'ora; David E. Alvarez Castillo; Dominik Ostrog\'orski; Jaroslaw Stasielak; Jilberto Zamora-Saa; Karel Smolek; Konrad Kopa\'nski

REVIEW 2 major objections 5 minor 11 references

Public engagement as a scientific tool to implement multi-messenger strategies with the Cosmic-Ray Extremely Distributed Observatory

T0 review · 2 major / 5 minor · reviewed 2026-08-14 · deepseek-v4-flash

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Pith's one-line read The CREDO collaboration proposes that citizen-owned phones and small detectors can catch cosmic-ray ensembles, a new multi-messenger channel.

desk verdict A clear, honest status report from CREDO with no new science; the public-engagement premise is coherent but the feasibility of the CRE search remains entirely unquantified. read the letter →

arxiv 1908.09734 v1 pith:FFFKT4R3 submitted 2019-08-26 astro-ph.IM

Piotr Homola , David E. Alvarez Castillo , Dariusz Góra , Alan R. Duffy , Bohdan Hnatyk , Pawe{l} Jagoda , Marcin Kasztelan , Konrad Kopański

show 13 more authors

Peter Kovacs Micha{l} Krupiński Alona Mozgova Vahab Nazari Michal Niedźwiecki Wojciech Noga Dominik Ostrogórski Karel Smolek Jaroslaw Stasielak Oleksandr Sushchov Tadeusz Wibig Krzysztof W. Woźniak Jilberto Zamora-Saa

This is my paper · ORCID

classification astro-ph.IM

keywords cosmic-rayensemblesmulti-messengerastrophysicscitizensciencesmartphonedetectorsairshowerssuper-heavydarkmatterpublicengagementastroparticlephysics

topics Dark Matter

open problems Dark Matter

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper seeks to establish that cosmic-ray ensembles—many air showers and individual particles arriving at Earth at the same time from a single distant process—are a real, unexplored class of cosmic-ray phenomenon that only a planetary, all-hands detector network could see. It argues that CREDO, built around citizen scientists with smartphones and small detectors, is the right instrument, and that public engagement is therefore a scientific necessity rather than an outreach add-on. It presents the infrastructure already in place: more than ten thousand devices, thousands of years of cumulative detection time, millions of particle-track candidates, and a first online experiment searching for anomalous time clustering. The hoped-for payoff is a new multi-messenger channel and access to physics at energies beyond accelerators.

What carries the argument

The key object is the Cosmic-Ray Ensemble (CRE): particles or photons produced by a single distant process that arrive simultaneously and generate many air showers, possibly thousands or millions, spread over the whole planet. The machinery that would detect it is a planetary network of heterogeneous detectors—smartphones, pocket scintillators, educational arrays, and professional observatories—whose data are combined and pattern-matched, with human volunteers reinforcing machine learning on anomaly recognition. This distributed-detection design is what turns public participation into a load-bearing scientific tool rather than a public-relations exercise.

What would settle it

Take the time-stamped track candidates from many CREDO devices and compare the rate of simultaneous multi-site events with the rate expected from independent cosmic-ray showers plus detector noise; if the observed coincidence rate matches expectation after correcting for device duty cycles, then the claimed ensemble signal is not present in the current data.

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Extended reading notes

Core claim

On the paper's own terms, the central claim is that the detection (or non-detection) of cosmic-ray ensembles would open a new method for exploring the universe and a new channel on the multi-messenger stage. The paper does not assert that such ensembles have been seen; it asserts that they are worth looking for with a sufficiently large, geographically distributed set of detectors, and that CREDO's citizen-science model is the practical way to build that set. A positive detection could test scenarios such as super-heavy dark matter decay; even a rigorous non-detection would constrain those scenarios. The supporting status report shows raw smartphone track counts and an early online experiment, but no claimed astrophysical discovery.

Load-bearing premise

Everything rests on the assumption that a worldwide collection of smartphones and small detectors can register cosmic-ray tracks with enough energy and timing accuracy, and can be synchronized across very different devices, to recognize many air showers arriving at the same time; the paper reports raw track counts but no calibration or false-positive analysis that would prove this assumption yet.

Editorial extensions

If this is right

Any single observatory operating alone will miss the class of events that CREDO targets, because an ensemble's footprint can span the globe.
If photon-originated ensembles exist, joint data from many detectors could reveal correlated structures containing thousands to millions of air showers.
A positive ensemble detection would test super-heavy dark matter decay and other high-energy scenarios not reachable in accelerators.
The same global monitoring infrastructure could be turned to geophysical and biophysical questions, such as earthquake-related cosmic-ray variations.
Even a well-defined non-detection of ensembles would yield constraints on exotic cosmic-ray production.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

An immediate testable extension would be to search the existing CREDO track database for multi-site time coincidences beyond what random independent showers and detector noise predict; the paper does not report such a coincidence analysis.
If timing across phones proves too coarse or poorly synchronized, the ensemble search could shift to larger educational detectors and professional arrays, which trade quantity for timing fidelity.
The citizen-science data stream carries built-in selection effects—when and where users run the app—so any claimed astrophysical clustering will need duty-cycle corrections before it can be distinguished from human activity patterns.
A null result from a global coincidence search could be re-read as a limit on super-heavy dark matter lifetime, a quantitative output the paper leaves implicit.

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Signed reviews

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

You should know this paper before citing it as evidence: it’s a 2019 conference proceedings status report from CREDO, not a research claim. The one thing that’s actually new here is the public-engagement model – using a global smartphone network to look for simultaneous air showers, or 'cosmic-ray ensembles'. The scientific concept itself (CRE, SHDM scenarios) is taken from the collaboration’s own earlier papers, which are cited. The paper adds no equations, no data analysis, no sensitivity projections.

What it does well: it is transparent about being programmatic. The abstract and Section 2 frame CRE detection as a promise, not an achievement. Section 3 calls the numbers 'particle track candidates' – unvalidated. The road map in Figure 2 labels SHDM as an example scenario to be tested, not evidence. So there is no internal contradiction and the paper doesn’t oversell. The writing is clear and the citizen-science rationale is reasonable: a planetary search for correlated shower fragments genuinely does require massive distributed detection, and involving the public is a plausible way to get that.

The soft spots are real but proportionate. The operational metrics (>10k devices, >1000 years detection time, >3M track candidates) are raw counts with no calibration, timing resolution, or false-positive analysis. The central feasibility question – whether heterogeneous, poorly synchronized detectors can recognize true multi-shower coincidences – is never addressed, and the paper admits as much by describing the search as future work. That is absence of result, not a defect in argument. The citation pattern is fine: self-citations to refs [1], [2] are appropriate because that’s where the science case is worked out, and external refs are used for open hardware and radiation biology.

Honestly, this is a conference paper, and it reads like one. For a reader who wants to know what CREDO is and why someone might join, it’s useful. For a referee looking for a testable claim, there is nothing to referee. If it came to a journal as a research article, I’d desk-reject; if it came as a community report or proceeding summary, it’s fine as is.

Recommendation: don't spend referee time on this in a research venue. It doesn’t pretend to be more than a status report. You could cite it as a pointer to the CREDO project, but not for any scientific result.

Referee Report

2 major / 5 minor

Summary. The paper presents the Cosmic-Ray Extremely Distributed Observatory (CREDO) as a citizen-science infrastructure for searching for cosmic-ray ensembles (CRE), defined as many air showers and individual particles arriving simultaneously at Earth. The authors argue that the globally distributed character of possible CRE signatures requires a planetary network of detectors, including smartphones, and that public engagement is therefore a methodological necessity rather than a purely ancillary outreach activity. They sketch a research road map with super-heavy dark matter decay and photon-induced cascades as example scenarios, and report operational metrics of the current network: over 10,000 registered devices, over 1,000 years of total detection time, and over 3 million raw particle-track candidates. They also describe the open-data policy, open-source software, and educational programs such as Particle Hunters. No detection of a CRE is claimed; the paper is a status report and invitation to participate.

Significance. If cosmic-ray ensembles exist and can be identified through a distributed network, the paper's proposed approach would open a genuinely new observational channel in multi-messenger astroparticle physics. The project is also notable for making data, software, and analysis avenues openly available, and for embedding education in the scientific data flow. However, all quantitative claims in the paper are operational counts of unvalidated candidates, and the predicted signatures, rates, and required timing/energy synchronization are not analyzed here. The significance is prospective; the paper succeeds as a clear statement of a research program and a public-engagement model, but it neither claims nor provides evidence of an astrophysical discovery.

major comments (2)

[Section 3, metrics paragraph] The statistics '>10k devices, >1000 years detection time, >3M particle track candidates' are presented without qualification beyond the word 'candidates.' Since the paper's scientific motivation depends on the ability to identify correlated multi-device events, please add an explicit caveat that these are raw, unvalidated detector triggers with no demonstrated time synchronization or false-positive rejection, and that no sensitivity to cosmic-ray ensembles has been demonstrated to date. This would prevent readers from overinterpreting the numbers as evidence of network capability.
[Section 1, zero-background claim] The statement that CRE might be detected 'even as zero-background events' is an important justification for the global-network concept, but no background estimate or coincidence-analysis procedure is provided anywhere in the paper. As written, this is an unsupported assertion. Either provide a rough order-of-magnitude argument for the expected signal and background rates, or rephrase it as a hope contingent on future analysis.

minor comments (5)

[Section 1] The phrase 'beneﬁcial for both for the project and for the contributors' contains a duplicated 'for'; it should read 'for both the project and the contributors.'
[Section 2] The phrase 'expert ad non-expert' contains a typo; it should read 'expert and non-expert.'
[Section 3] Figure 3's caption, 'The variety of particle tracks candidates,' should be 'particle-track candidates' or 'particle track candidates' for consistency with the text.
[Acknowledgements] The acknowledgements contain the typo 'Academic Computig Center'; it should be 'Academic Computing Center.'
[Section 2] The phrase 'data inter-change' would be more standard as 'data interchange'.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; the paper is a programmatic status report with no derived predictions or fitted parameters.

full rationale

The paper contains no derivation chain that reduces to its own inputs. It defines cosmic-ray ensembles (CRE) as a hypothetical multi-air-shower signature, describes the CREDO citizen-science infrastructure, and reports operational metrics such as '>10k devices, >1000 years detection time, >3M particle track candidates'. These are explicitly track candidates, with no claim that they constitute a detection or are fed into any fitted prediction. The central scientific claim—that 'the detection (or non-detection) of such particle groups promises to open up a new method for exploring our universe'—is conditional and programmatic, not derived from any equation or from the cited CREDO papers. References [1] and [2] are self-citations used only as examples of CRE-generating scenarios, but the paper's conclusions do not rely on the correctness of those scenarios; the road map in Section 2 explicitly frames them as testable hypotheses. There is no fitted input called a prediction, no imported uniqueness theorem, no ansatz smuggled via citation, and no renaming of a known result. The absence of calibration, timing, and false-positive analysis is a verifiability gap in the project's future scientific goals, not a circularity in the argument of this paper. Thus the appropriate finding is no significant circularity.

Assumptions & free parameters 0 free parameters · 4 assumptions · 1 invented entities

The central premise of CREDO depends on several unverified assumptions: the existence of cosmic-ray ensembles, the ability of consumer detectors to contribute meaningfully, and the feasibility of global time synchronization. These are domain assumptions, not standard math. No free parameters are fitted.

assumptions (4)

domain assumption Cosmic-ray ensembles (CRE) may exist and arrive at Earth as simultaneous multi-air-shower events.
The entire CREDO mission is premised on this unverified hypothesis; the paper cites earlier CREDO papers (refs [1], [2]) but presents no detection.
domain assumption Smartphones, pocket scintillators, and other small detectors can detect cosmic-ray particles with sufficient fidelity to contribute to CRE searches.
The paper assumes these consumer devices work as scientific detectors (Section 1), but gives no calibration or validation data.
domain assumption A planetary network of small detectors can be time-synchronized well enough to identify correlated showers.
The paper assumes global correlation is feasible (Section 1), but provides no timing synchronization analysis.
domain assumption Human pattern recognition can complement machine learning in identifying unexpected cosmic-ray anomalies.
Section 2 asserts this based on analogy with Planet Hunters TESS (ref [4]), not on CREDO-specific evidence.

invented entities (1)

Cosmic-ray ensemble (CRE)
purpose: A hypothesized event composed of multiple air showers or individual cosmic-ray particles arriving simultaneously to Earth; the target of CREDO's search.
CRE are introduced as a new observable in Figure 1 and Section 1, but no direct detection or independent experimental handle is provided; the paper only proposes to search for them.

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Cite this review

Pith. "Pith review of Public engagement as a scientific tool to implement multi-messenger strategies with the Cosmic-Ray Extremely Distributed Observatory." pith.science (2026). https://pith.science/paper/FFFKT4R3

@misc{pith2026190809734,
  author       = {Pith},
  title        = {Pith review of: Public engagement as a scientific tool to implement multi-messenger strategies with the Cosmic-Ray Extremely Distributed Observatory},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/FFFKT4R3}},
  note         = {Machine review of arXiv:1908.09734}
}

read the original abstract

The Cosmic-Ray Extremely Distributed Observatory (CREDO) uses the hunt for particle cascades from deep space as a vehicle for a unique "bottom-up" approach to scientific research. By engaging the non-specialist public of all ages as "citizen scientists" we create opportunities for lifelong learning for individuals as well as for cooperation and the sharing of common educational tools amongst institutions. The discoveries of these citizen scientists will feed directly into a pioneering new area of scientific research oriented on Cosmic Ray Ensembles (CRE). The detection (or non-detection) of such particle groups promises to open up a new method for exploring our universe, and a new channel on the multi-messenger stage, oriented on both astro- and geo-investigations. The opportunities this would create for cross-disciplinary research are significant and beneficial for individuals, networks of institutions and the global communities of both professional scientists and science enthusiasts.

Figures

Figures reproduced from arXiv: 1908.09734 by the authors.

**Figure 1.** A generalization of cosmic-ray research by admitting Cosmic-Ray Ensembles as a subject of observation. The Cosmic-Ray Extremely Distributed Observatory (CREDO) aims at searching for the yet not checked multi cosmic-ray signatures that are composed of many air showers and individual particles arriving simultaneously to the Earth, so-called cosmic-ray ensembles (CRE), as illustrated in [PITH_FULL_IMAGE:figures/fu… view at source ↗

**Figure 2.** The CREDO research road map, the “scenarios” branch. Here the SHDM decay is used as an example CRE scenario, and for the sake of clarity the products of the decay are represented by just one photon. The road map begins with a scenario that predicts CRE: a large size cosmic-ray phenomenon. In our example here we point to SHDM, one of dark matter scenarios, so far not supported but also not excluded by available me… view at source ↗

**Figure 3.** The variety of particle tracks candidates as registered by a smartphone using the CREDO Detector app [6]. CREDO is already a self-standing open observatory and international collaboration of 23 institutions from 11 countries ([5]. We have already enabled mass participation data acquisition with smartphones (the CREDO Detector app [6]): > 10k devices, > 1000 years detection time, > 3M particle track candidates - se… view at source ↗

Discussion (0). Continue with ORCID to comment.

Reference graph

Works this paper leans on

11 extracted references · 10 canonical work pages

[1]

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[2]

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2000

Pith tools

Reviewed August 14, 2026 · model on record in the stance chip above.

[1] [1]

Homola, et al

P. Homola, et al. (CREDO Collab.), CERN Proceedings, 1 (2018) 289, arXiv:1804.05614, DOI: 10.23727/CERN-Proceedings-2018-001.289

arXiv 2018

[2] [2]

Cosmic ray ensembles as signatures of ultra-high energy photons interacting with the solar magnetic field

N. Dhital, et al. (CREDO Collab.),2018, arXiv:1811.10334

work page Pith review arXiv 2018

[3] [3]

Jacobson, S

T. Jacobson, S. Liberati, and D. Mattingly, Annals Phys. 321 (2006) 150

work page 2006

[4] [4]

https://www.zooniverse.org/projects/nora-dot-eisner/planet-hunters-tess [as on 10 Jun 2019]

work page 2019

[5] [5]

https://credo.science [as on 10 Jun 2019]

work page 2019

[6] [6]

https://credo.science/credo-detector-mobile-app/; https://www.eurekalert.org/pub_releases/2018-06/thni-cyt061218.php [as on 10 Jun 2019]

work page 2018

[7] [7]

http://www.cosmicwatch.lns.mit.edu/ [as on 10 Jun 2019]

work page 2019

[8] [8]

https://www.eurekalert.org/pub_releases/2018-10/thni-cﬂ100418.php

work page 2018