Routing protocol

Physics

Spacetime

Charge (physics)

Computer network

Mathematical physics

Spinor

Black hole (networking)

Link-state routing protocol

Neutrino

Wormhole

Theoretical physics

Computer science

Fermion

Massless particle

Dirac (video compression format)

Quantum mechanics

Routing (electronic design automation)

Dirac fermion

Physical Review Letters

We construct a specific example of a class of traversable wormholes in Einstein-Dirac-Maxwell theory in four spacetime dimensions, without needing any form of exotic matter. Restricting to a model with two massive fermions in a singlet spinor state, we show the existence of spherically symmetric asymptotically flat configurations which are free of singularities, representing localized states. These solutions satisfy a generalized Smarr relation, being connected with the extremal Reissner-Nordstr\"om black holes. They also possess a finite mass $M$ and electric charge $Q_e$, with $Q_e/M>1$. An exact wormhole solution with ungauged, massless fermions is also reported.

Traversable Wormholes in Einstein-Dirac-Maxwell Theory