Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links
Paper Citation Record · LEDGER
As of 18 August 2026, this Paper Citation Record lists 0 of 0 outbound references and 3 inbound Pith citation observations for arXiv:2106.07981.
A citation records a reference. It does not transfer a finding from one paper to another.
Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-18T06:34:40.430872+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links, observed 2026-07-14T10:10:18.422736Z
A source-named dated measurement, never combined with another source.
Source: arxiv_reference, observed 2026-05-16T11:20:52.852853Z
0 of 0 outbound references displayed
External citation measurements
No source-named external measurement is stored.
No outbound reference observations are available for this paper version.
Observation a0bb42a2-5721-4b25-afb6-097f03d358fd · inbound
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A$^*$ Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor
Reference 223
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 0bfc5d44-44ab-4651-88c2-15a7e3a52cc8 · inbound
Photon rings and shadows of black holes with non-minimal couplings between curvature and electromagnetic field Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor
Reference 84
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 4c9bd00f-8133-4cc4-8871-d9e2d71953d7 · inbound
Polarization-dependent observational signatures of Weyl-coupled photons around a black hole Polarized image of a Schwarzschild black hole with a thin accretion disk as photon couples to Weyl tensor
Reference 26
Source-reported events for the cited work
Unavailable: canonical work link unavailable.