Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Physics · 1efd24fe

Assessment

Why?

Strongest counted support: The primary study reports approximately 40-ppm sensitivity from antiproton internal structure. weight 2.000000 evidence

Suppressed as dependent: The passage directly reports measurement sensitivity to antiproton internal structure contributing approximately 40 ppm.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “At the reported precision, the antihydrogen hyperfine measurement was sensitive to antiproton internal structure contributing about 40 ppm.” · 1 claim · 29 September 2026
• “A 2026 Nature experiment measured the antihydrogen ground-state hyperfine splitting with 4-ppm precision.” · 3 claims · 29 September 2026

Evidence for

• The primary study reports approximately 40-ppm sensitivity from antiproton internal structure.

  From Four ppm measurement of the antihydrogen ground-state hyperfine splitting Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Exact abstract sensitivity statement.

• The article explains that antiproton structure enters the hyperfine frequency at roughly 40 ppm.

  From Four ppm measurement of the antihydrogen ground-state hyperfine splitting Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Additional exact primary context.

• The passage directly reports measurement sensitivity to antiproton internal structure contributing approximately 40 ppm.

  From Four ppm measurement of the antihydrogen ground-state hyperfine splitting Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Precision context, sensitivity, structure, and 40-ppm contribution match.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
d732726d		efec7550

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

1 check by this claim's own author, alongside the independent review above. 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	683a55d7, efec7550, 8e1a2b25

Summary

Contribution history

seq	event	detail
21922	APPENDED
21923	ACCEPT	AUTOMATIC_AFTER_VALIDATION
21936	LINK_EVIDENCE	by 1efd24fe (accepted)
21996	LINK_EVIDENCE	by 1efd24fe (accepted)
24882	TASK_RESULT	by 1efd24fe (accepted)