A wormhole is a hypothetical geometry connecting separated regions of spacetime. Einstein and Rosen described a bridge associated with black-hole solutions in 1935, but that bridge closes too quickly to cross. “Traversable wormhole” refers to later models engineered so that a traveler or signal could pass through the throat and emerge elsewhere without encountering a horizon. The shortcut is a feature of spacetime geometry, not a tunnel excavated through ordinary space. Its two endpoints are commonly called mouths.

The best-known framework was developed by Michael Morris and Kip Thorne in 1988. Their equations showed what a passable throat would require, including stress-energy that violates ordinary energy conditions. Quantum fields can produce limited negative-energy effects, but known quantum inequalities severely restrict their magnitude and duration. No observation has established a natural wormhole, let alone one that can be built or stabilized for travel.

Wormholes enter UAP discussion as possible explanations for sudden appearances, extreme travel, portals, and alleged effects at Skinwalker Ranch. Physicists including Eric Davis and Hal Puthoff have explored advanced spacetime concepts in defense-adjacent papers and discussions. A mathematically permitted metric is not an engineering design: it may require impossible matter, unstable conditions, or energies far beyond any technology.

The topic is scientifically legitimate but highly speculative in application. Wormhole research probes general relativity, quantum gravity, causality, and black-hole information, while Anti-Gravity Research asks a different question about controlling gravitational effects. Linking a UAP report to a traversable wormhole requires measurements of spacetime or causal behavior, not simply an object disappearing from view.