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Holographic Complexity for Defects Distinguishes Action from Volume

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arxiv 1811.12549 v1 pith:EJHHANGT submitted 2018-11-30 hep-th gr-qcquant-ph

classification hep-thgr-qcquant-ph
keywords complexitydefectboundaryholographicactioncasedefectsexplore
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We explore the two holographic complexity proposals for the case of a 2d boundary CFT with a conformal defect. We focus on a Randall-Sundrum type model of a thin AdS$_2$ brane embedded in AdS$_3$. We find that, using the "complexity=volume" proposal, the presence of the defect generates a logarithmic divergence in the complexity of the full boundary state with a coefficient which is related to the central charge and to the boundary entropy. For the "complexity=action" proposal we find that the complexity is not influenced by the presence of the defect. This is the first case in which the results of the two holographic proposals differ so dramatically. We consider also the complexity of the reduced density matrix for subregions enclosing the defect. We explore two bosonic field theory models which include two defects on opposite sides of a periodic domain. We point out that for a compact boson, current free field theory definitions of the complexity would have to be generalized to account for the effect of zero-modes.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. On decoding the string from interfaces in 2d conformal field theories

    hep-th 2025-11 conditional novelty 6.0 of 10

    Stringy vibrations of an AdS3 junction between two thermal CFTs map to half-sided conformal transformations, producing perfectly reflected wavepackets, and are readable from interval entanglement entropy even at zero tension.

  2. Wedge Holographic Complexity in Karch-Randall Braneworld

    hep-th 2024-12 conditional novelty 6.0 of 10

    For a wedge black string with fluctuating branes, the Complexity=Action growth rate gains a constant edge-mode term while Complexity=Volume gains a fluctuation-squared correction, breaking the naive equivalence of the...

  3. Does Boundary Distinguish Complexities?

    hep-th 2019-08 conditional novelty 6.0 of 10

    In BCFT, boundary complexity increments show the same divergent structure for volume, action, and path-integral measures in d>2, but in d=2 the action measure gives a finite constant instead of a logarithmic divergence.

  4. On volume subregion complexity in Vaidya spacetime

    hep-th 2019-08 conditional novelty 6.0 of 10

    In the AdS3 Vaidya geometry, the extremal volume defining holographic subregion complexity is genuinely x-dependent during the quench, so the standard x-independent ansatz fails at intermediate times; early and late t...

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