Jonathan A. Rebouças

Can modified entropy laws replace exotic matter for wormholes? Testing five non-standard models, physicists found each naturally generates matter with negative energy density—exactly what keeps spacetime tunnels open. This links entropic gravity theory to the prospect of interstellar travel.

Physicists added gravitational memory to models of wormholes supported by the Casimir effect. Memory, like a wave's footprint, changes the energy distribution: the wormhole becomes sturdier and outwardly resembles a black hole. Its shadow matches measurements of M87*, pointing the way to discovering