Black‑hole imposters hypothesis

Some objects we call black holes might be externally indistinguishable yet internally governed by unfamiliar spacetime physics (no classical horizon, exotic cores, or causal rewiring). Improved observational probes — horizon‑scale radio imaging, precise gravitational‑wave signatures, and high‑resolution timing — could detect deviations from general relativity and reveal whether 'imposter' models are realized in nature. — If confirmed, this would upend foundational assumptions about spacetime, causality and energy, with knock‑on effects for cosmology, quantum gravity research priorities, and public narratives about the limits of physical knowledge.