Publications Repository - Gdańsk University of Technology

The final state proposal [G.T. Horowitz and J.M. Maldacena, J. High Energy Phys.2004(2),8 (2004)] is an attempt to relax the apparent tension betweenstring theory and semiclassicalarguments regarding the unitarity of black hole evaporation. The authors of [R. Bousso and D.Stanford, Phys. Rev. D89, 044038 (2014)] analyze thought experiments where an infalling observerfirst verifies the entanglement between early and late Hawking modes and then verifies the interiorpurification of the same Hawking particle. They claim that “probabilities for outcomes of thesemeasurements are not defined” and therefore suggest that “the final state proposal does not offera consistent alternative to the firewall hypothesis.” We show, in contrast, that one may define allthe relevant probabilities based on the so-called ABL rule [Y. Aharonov, P.G. Bergmann, and J.L.Lebowitz, Phys. Rev.134, 1410 (1964)], which is better suited for this task than the decoherencefunctional. We thus assert that the analysis of Bousso and Stanford cannot yet rule out the finalstate proposal.

Authors

• Eliahu Cohen,
• dr inż. Marcin Nowakowski link open in new tab