Islands and traversable wormholes

Abstract

We study information recovery in black hole evaporation using traversable wormhole protocols in AdS2 Jackiw-Teitelboim gravity with matter fields coupled to an external bath. By introducing a simple non-local interaction between left and right radiation regions, we generate negative-energy shockwaves that render the wormhole traversable. We compute the resulting shifts in Kruskal coordinates, changes in the stress tensor, and backreaction effects on quantum extremal surfaces, finding a consistent decrease of the generalized entropy that aligns with the flat Page curve. Finally, we analyze the impact of negative-energy shocks on boundary two-point functions, providing a microscopic probe of island/radiation duality and discussing possible implications for experimental realizations in analog quantum-mechanical models.