Paper Citation Record · LEDGER

Hydrogen 21 cm Constraints on the Photon's Spin Scale

As of 18 August 2026, this Paper Citation Record lists 25 of 25 outbound references and 1 inbound Pith citation observation for arXiv:2505.15890.

A citation records a reference. It does not transfer a finding from one paper to another.

pith.paper-citation-record.v1
2505.15890 v2

Coverage vector

measured 25 of 25 reference resolution

Typed states for the displayed outbound observations.

Source: paper_references, paper_reference_links, observed 2026-08-07T15:18:45.224624Z

measured 26 of 26 standing notices

One-hop event checks from named stored sources.

Source: scholarly_work_events, retraction_status_cache, observed 2026-08-18T06:34:40.430872+00:00

measured 1 of 1 inbound itemization

Pith citing papers itemized under the disclosed page cap.

Source: paper_references, paper_reference_links, observed 2026-08-16T04:30:05.184386Z

measured 0 of 1 external citation measurements

A source-named dated measurement, never combined with another source.

Source: pith, observed 2026-08-16T04:30:05.343509Z

Reference resolution

25 of 25 outbound references displayed

verified exact1
verified fuzzy6
unresolved18
parse uncertain0
malformed identifier0
metadata mismatch0

External citation measurements

No source-named external measurement is stored.

Outbound references

Observation 0ec6cc58-1fc1-4ea8-aeae-9e17c214ed1f · outbound

This paper cites an unresolved cited work.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Unresolved cited work

Reference 1

Resolution: unresolved; raw_fallback, observed 2026-08-07T15:18:47.375100Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation 1a4cb6ea-5294-43ca-8d08-a317120c6452 · outbound

This paper cites A CSP Field Theory with Helicity Correspondence.

Hydrogen 21 cm Constraints on the Photon's Spin Scale A CSP Field Theory with Helicity Correspondence

Reference 2

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:42.821034Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 142269ca-d950-44f6-a0e8-eb21f32d57e8 · outbound

This paper cites Interactions of Particles with "Continuous Spin" Fields.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Interactions of Particles with "Continuous Spin" Fields

Reference 3

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:42.908309Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 724e9499-f540-436a-8dee-7aa47600a365 · outbound

This paper cites On the Theory of Continuous-Spin Particles: Wavefunctions and Soft-Factor Scattering Amplitudes.

Hydrogen 21 cm Constraints on the Photon's Spin Scale On the Theory of Continuous-Spin Particles: Wavefunctions and Soft-Factor Scattering Amplitudes

Reference 4

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.051421Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 9fa79083-d9eb-4296-8ece-fce06cc2083b · outbound

This paper cites On the Theory of Continuous-Spin Particles: Helicity Correspondence in Radiation and Forces.

Hydrogen 21 cm Constraints on the Photon's Spin Scale On the Theory of Continuous-Spin Particles: Helicity Correspondence in Radiation and Forces

Reference 5

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.165492Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation bfbfb075-72c0-41cb-a24d-9d73345996c7 · outbound

This paper cites Probing "Continuous Spin" QED with Rare Atomic Transitions.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Probing "Continuous Spin" QED with Rare Atomic Transitions

Reference 6

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.261673Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation cdf55267-fa38-4e09-8f68-3c98fa626622 · outbound

This paper cites 21-cm cosmology.

Hydrogen 21 cm Constraints on the Photon's Spin Scale 21-cm cosmology

Reference 7

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.383065Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 23eabd56-7c7a-4a51-a86d-9c8921ff8834 · outbound

This paper cites light shining through a wall.

Hydrogen 21 cm Constraints on the Photon's Spin Scale light shining through a wall

Reference 8

Resolution: verified fuzzy; raw_fallback, observed 2026-08-07T15:18:47.544738Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation f74329e0-5030-4139-94b5-0e142d09e1c4 · outbound

This paper cites Interactions of a Continuous-Spin Field with a Spin-1/2 Particle.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Interactions of a Continuous-Spin Field with a Spin-1/2 Particle

Reference 9

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.426619Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 9b7a1257-4cb9-47c0-aeb9-e97a4a171862 · outbound

This paper cites an unresolved cited work.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Unresolved cited work

Reference 10

Resolution: unresolved; raw_fallback, observed 2026-08-07T15:18:47.231636Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation 56375111-02c3-4fe1-8325-416184a819c5 · outbound

This paper cites Kleppner, H.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Kleppner, H

Reference 11

Resolution: verified fuzzy; raw_fallback, observed 2026-08-07T15:18:47.034873Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation dc639e6c-91ad-4137-8cd0-8984ccf77fdf · outbound

This paper cites Quantum Electrodynamics Mediated by a Photon with Generalized (Continuous) Spin.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Quantum Electrodynamics Mediated by a Photon with Generalized (Continuous) Spin

Reference 12

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.748159Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 153cedc9-5798-4115-83cf-fb5e04bdadb1 · outbound

This paper cites Spinning Particles in Quantum Mechanics and Quantum Field Theory.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Spinning Particles in Quantum Mechanics and Quantum Field Theory

Reference 13

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:43.863297Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation de61718a-ae7d-4870-8b69-4cf435659ddd · outbound

This paper cites an unresolved cited work.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Unresolved cited work

Reference 14

Resolution: verified exact; raw_fallback, observed 2026-08-07T15:18:45.574813Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation d3faf398-d173-4b61-856e-493109383d8a · outbound

This paper cites Brink, S.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Brink, S

Reference 15

Resolution: verified fuzzy; raw_fallback, observed 2026-08-07T15:18:46.834069Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation 553d3a07-1b51-45f5-88f7-3b0178a9f1b0 · outbound

This paper cites Brink, P.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Brink, P

Reference 16

Resolution: verified fuzzy; raw_fallback, observed 2026-08-07T15:18:46.726183Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation c40e26f7-ea15-4d0c-a53d-4804c476c5d6 · outbound

This paper cites In-beam measurement of the hydrogen hyperfine splitting - towards antihydrogen spectroscopy.

Hydrogen 21 cm Constraints on the Photon's Spin Scale In-beam measurement of the hydrogen hyperfine splitting - towards antihydrogen spectroscopy

Reference 17

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:44.230214Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation ffa4afb1-2f08-4ab9-8fe4-9be25dc4d901 · outbound

This paper cites Hellwig, R.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Hellwig, R

Reference 18

Resolution: verified fuzzy; raw_fallback, observed 2026-08-07T15:18:46.485846Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation 1a0f69fc-3ca0-4c53-9b49-f4f1f3b15a13 · outbound

This paper cites Essen, R.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Essen, R

Reference 19

Resolution: verified fuzzy; raw_fallback, observed 2026-08-07T15:18:46.325979Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation d4a278c0-d78d-4077-ac23-12a0034109b7 · outbound

This paper cites an unresolved cited work.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Unresolved cited work

Reference 20

Resolution: unresolved; raw_fallback, observed 2026-08-07T15:18:46.131853Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation 3e34b543-0f45-4578-bcea-7ce57ad57e4b · outbound

This paper cites Thermodynamics of Continuous Spin photons.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Thermodynamics of Continuous Spin photons

Reference 21

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:44.724686Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 3bd074ed-ffb5-4a90-99ae-ca015d531e75 · outbound

This paper cites New Measurement of the Electron Magnetic Moment and the Fine Structure Constant.

Hydrogen 21 cm Constraints on the Photon's Spin Scale New Measurement of the Electron Magnetic Moment and the Fine Structure Constant

Reference 22

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:44.862542Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation 2d2d3303-4663-441d-87df-b368c0792951 · outbound

This paper cites an unresolved cited work.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Unresolved cited work

Reference 23

Resolution: unresolved; raw_fallback, observed 2026-08-07T15:18:45.882482Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.

Observation a9571b41-d44d-445c-8095-331cbe188338 · outbound

This paper cites Light shining through walls.

Hydrogen 21 cm Constraints on the Photon's Spin Scale Light shining through walls

Reference 24

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:45.127891Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Observation b7f32bbd-8548-45d2-aa9f-68d8b828a8d0 · outbound

This paper cites First look at continuous spin gravity: Time delay signatures.

Hydrogen 21 cm Constraints on the Photon's Spin Scale First look at continuous spin gravity: Time delay signatures

Reference 25

Resolution: unresolved; no resolver link, observed 2026-08-07T15:18:45.224624Z

Source-reported events for the cited work

Unavailable: canonical work link unavailable.

Pith citing papers

Observation ca6cd294-8301-4ea5-a347-14343c5b22a0 · inbound

Probing "Continuous Spin" QED with Rare Atomic Transitions cites this paper.

Probing "Continuous Spin" QED with Rare Atomic Transitions Hydrogen 21 cm Constraints on the Photon's Spin Scale

Reference 15

Resolution: verified exact; local_arxiv, observed 2026-08-16T04:30:05.348147Z

Source-reported events for the cited work

No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.