Energy Reflection and Transmission at 2D Holographic Interfaces

Constantin Bachas, Shira Chapman, Dongsheng Ge, Giuseppe Policastro

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Scattering from conformal interfaces in two dimensions is universal in that the flux of reflected and transmitted energy does not depend on the details of the initial state. In this Letter, we present the first gravitational calculation of energy reflection and transmission coefficients for interfaces with thin-brane holographic duals. Our result for the reflection coefficient depends monotonically on the tension of the dual string anchored at the interface and obeys the lower bound recently derived from the averaged-null-energy condition in conformal field theory. The boundary-conformal-field-theory limit is recovered for infinite ratio of the central charges.

Original languageEnglish
Article number231602
JournalPhysical Review Letters
Issue number23
StatePublished - 2 Dec 2020
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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