Knitting wormholes by entanglement in supergravity

Balasubramanian, Vijay; DeCross, Matthew; Sárosi, Gábor

doi:10.1007/jhep11(2020)167

Cited by 9 publications

(5 citation statements)

References 52 publications

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“…In this setting, the ER=EPR principle says that this entanglement can be geometrized as a wormhole that connects the black hole interior to the far radiation region. Much effort has gone into making this idea concrete, including the development of stringy models [47], large supergravity wormholes 3 created by entanglement [50], and toy models which exhibit phase transitions driven by coupling [46,[51][52][53] or entanglement [33].…”

Section: An Example: Er=epr From a Classical Scalar Fieldmentioning

confidence: 99%

Entanglement between two disjoint universes

Balasubramanian

Kar

Ugajin

2021

J. High Energ. Phys.

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We use the replica method to compute the entanglement entropy of a universe without gravity entangled in a thermofield-double-like state with a disjoint gravitating universe. Including wormholes between replicas of the latter gives an entropy functional which includes an “island” on the gravitating universe. We solve the back-reaction equations when the cosmological constant is negative to show that this island coincides with a causal shadow region that is created by the entanglement in the gravitating geometry. At high entanglement temperatures, the island contribution to the entropy functional leads to a bound on entanglement entropy, analogous to the Page behavior of evaporating black holes. We demonstrate that the entanglement wedge of the non-gravitating universe grows with the entanglement temperature until, eventually, the gravitating universe can be entirely reconstructed from the non-gravitating one.

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Section: An Example: Er=epr From a Classical Scalar Fieldmentioning

confidence: 99%

Entanglement between two disjoint universes

Balasubramanian

Kar

Ugajin

2021

J. High Energ. Phys.

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“…In the UV complete realization in terms of multiple AdS throats, one might of course ask whether there could be wormhole configurations that join these individual throats, perhaps via some generalization of the construction presented in [56]. The general point is that our construction only mimics an ensemble average provided we have sufficient statistics.…”

Section: Holographic Interpretationmentioning

confidence: 99%

Disorder Averaging and its UV (Dis)Contents

Heckman,

Turner,

2021

Preprint

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We present a stringy realization of quantum field theory ensembles in D ≤ 4 spacetime dimensions, thus realizing a disorder averaging over coupling constants. When each member of the ensemble is a conformal field theory with a standard semi-classical holographic dual of the same radius, the resulting bulk can be interpreted as a single asymptotically Anti-de Sitter space geometry with a distribution of boundary components joined by wormhole configurations, as dictated by the Hartle-Hawking wave function. This provides a UV completion of a recent proposal by Marolf and Maxfield that there is a high-dimensional Hilbert space for baby universes, but one that is compatible with the proposed Swampland constraints of McNamara and Vafa. This is possible because our construction is really an approximation that breaks down both at short distances, but also at low energies for objects with a large number of microstates. The construction thus provides an explicit set of counterexamples to various claims in the literature that holographic and effective field theory considerations can be reliably developed without reference to any UV completion.

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“…In this setting, the ER = EPR principle says that this entanglement can be geometrized as a wormhole that connects the black hole interior to the far radiation region. Much effort has gone into making this idea concrete, including the development of stringy models [49][50][51], large supergravity wormholes 10 created by entanglement [54], and toy models which exhibit phase transitions driven by coupling [47,[55][56][57] or entanglement [33].…”

Section: An Example: Er = Epr From a Classical Scalar Fieldmentioning

confidence: 99%

Entanglement between two gravitating universes

Balasubramanian

Kar

Ugajin

2022

Class. Quantum Grav.

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We study two disjoint universes in an entangled pure state. When only one universe contains gravity, the path integral for the n th Rényi entropy includes a wormhole between the n copies of the gravitating universe, leading to a standard “island formula” for entanglement entropy consistent with unitarity of quantum information. When both universes contain gravity, gravitational corrections to this configuration lead to a violation of unitarity. However, the path integral is now dominated by a novel wormhole with 2n boundaries connecting replica copies of both universes. The analytic continuation of this contribution involves a quotient by Ζ n replica symmetry, giving a cylinder connecting the two universes. When entanglement is large, this configuration has an effective description as a “swap wormhole”, a geometry in which the boundaries of the two universes are glued together by a “swaperator”. This description allows precise computation of a generalized entropy-like formula for entanglement entropy. The quantum extremal surface computing the entropy lives on the Lorentzian continuation of the cylinder/swap wormhole, which has a connected Cauchy slice stretching between the universes – a realization of the ER=EPR idea. The new wormhole restores unitarity of quantum information.

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Knitting wormholes by entanglement in supergravity

Cited by 9 publications

References 52 publications

Entanglement between two disjoint universes

Entanglement between two disjoint universes

Disorder Averaging and its UV (Dis)Contents

Entanglement between two gravitating universes

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