Physical significance of non‑Schwarzschild black holes in quadratic gravity

Ascertain whether non‑Schwarzschild black‑hole solutions in quadratic‑curvature gravity can be dynamically formed and are stable, and determine their observational implications for astrophysics and gravitational waves.

Background

Quadratic gravity admits additional black‑hole families beyond the Schwarzschild solution due to higher‑derivative field equations. Their relevance depends on formation, stability, and observational signatures.

The panel highlighted that despite their mathematical existence, the physical status of these solutions remains uncertain.