Information is not lost in the evaporation of 2D black holes

Abhay Ashtekar, Victor Taveras, Madhavan Varadarajan

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


We analyze Hawking evaporation of the Callan-Giddings-Harvey-Strominger black holes from a quantum geometry perspective and show that information is not lost, primarily because the quantum space-time is sufficiently larger than the classical. Using suitable approximations to extract physics from quantum space-times we establish that (i) the future null infinity of the quantum space-time is sufficiently long for the past vacuum to evolve to a pure state in the future, (ii) this state has a finite norm in the future Fock space, and (iii) all the information comes out at future infinity; there are no remnants.

Original languageEnglish (US)
Article number211302
JournalPhysical review letters
Issue number21
StatePublished - May 27 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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