T² Shadow Radius vs EHT
For M87* (M=6.5×10⁹ M_☉, d=16.8 Mpc): GR photon sphere prediction R_shadow=3√3GM/c² gives θ_GR=19.85 μas (EHT observed: 42±3 μas; the EHT ring includes photon ring amplification). T² outer torus angular size θ_τ=4πGM/(c²d)=48.00 μas (within 14% of EHT at R_S scale). The τ-BH shad
What this page is
This is a public Results-lane surface for a noteworthy Physics Registry item. It is generated from the Corpus Registry triage catalogue and keeps the generic Result catalogue unchanged.
Registry evidence
- Registry item: V.P124
- Type: proposition
- Scope: tau-effective
- Lean status: formalized
- Book / part / chapter: Book V · Part 6 · Chapter 50
Result summary
For M87* (M=6.5×10⁹ M_☉, d=16.8 Mpc): GR photon sphere prediction R_shadow=3√3GM/c² gives θ_GR=19.85 μas (EHT observed: 42±3 μas; the EHT ring includes photon ring amplification). T² outer torus angular size θ_τ=4πGM/(c²d)=48.00 μas (within 14% of EHT at R_S scale). The τ-BH shadow requires photon orbit analysis in T² geometry; exact photon sphere radius in T² is an open problem. Scope conjectural until T² photon orbit derived.
Related Results surfaces
Reading role
Use as Registry evidence for an existing Results surface.
Claim boundary
This page reports a Registry-backed internal result surface. It is not an external validation claim, a scientific consensus claim, or independent acceptance.
Curation rationale
- physics-facing terms: photon, shadow
- result-facing terms: prediction
- candidate is better handled as evidence for an inferred existing public surface
Review notes
- No additional review notes recorded.