Asymptotic symmetries and electromagnetic memory

Pasterski, Sabrina

doi:10.1007/jhep09(2017)154

Cited by 117 publications

(156 citation statements)

References 27 publications

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“…We find emergent CS gauge fields localized on ∂AdS Poincare 4 as well as on the Poincare horizon, connected by this soft limit. These CS fields connect to analogs of electromagnetic memory effects in Mink 4 [21][22][23]36], which we will refer to as "shadow" effects, since they relate to the holographically emergent spatial direction rather than time. We will also see a sense in which a finite CS level emerges.…”

Section: Jhep01(2018)014mentioning

confidence: 99%

“…The infinite-dimensional AS then describe the soft field dressing of a hard process, and are sensitive to the passage of charge/energy-momentum as a function of angle, through "memory" effects [21][22][23][24][25][26][27][28][29][30]. This generalization of the usual overall charge/energy-momentum conservation laws has led to the suggestion that AS charges can act as a new subtle form of "hair" that can characterize black holes (or other complex states), giving a finer understanding of black hole entropy and information puzzles [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Asymptotic symmetries, holography and topological hair

Mishra¹,

Sundrum²

2018

J. High Energ. Phys.

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Asymptotic symmetries of AdS 4 quantum gravity and gauge theory are derived by coupling the holographically dual CFT 3 to Chern-Simons gauge theory and 3D gravity in a "probe" (large-level) limit. Despite the fact that the three-dimensional AdS 4 boundary as a whole is consistent with only finite-dimensional asymptotic symmetries, given by AdS isometries, infinite-dimensional symmetries are shown to arise in circumstances where one is restricted to boundary subspaces with effectively two-dimensional geometry. A canonical example of such a restriction occurs within the 4D subregion described by a Wheeler-DeWitt wavefunctional of AdS 4 quantum gravity. An AdS 4 analog of Minkowski "super-rotation" asymptotic symmetry is probed by 3D Einstein gravity, yielding CFT 2 structure (in a large central charge limit), via AdS 3 foliation of AdS 4 and the AdS 3 /CFT 2 correspondence. The maximal asymptotic symmetry is however probed by 3D conformal gravity. Both 3D gravities have Chern-Simons formulation, manifesting their topological character. Chern-Simons structure is also shown to be emergent in the Poincare patch of AdS 4 , as soft/boundary limits of 4D gauge theory, rather than "put in by hand" as an external probe. This results in a finite effective Chern-Simons level. Several of the considerations of asymptotic symmetry structure are found to be simpler for AdS 4 than for Mink 4 , such as non-zero 4D particle masses, 4D non-perturbative "hard" effects, and consistency with unitarity. The last of these in particular is greatly simplified because in some setups the time dimension is explicitly shared by each level of description: Lorentzian AdS 4 , CFT 3 and CFT 2 . Relatedly, the CFT 2 structure clarifies the sense in which the infinite asymptotic charges constitute a useful form of "hair" for black holes and other complex 4D states. An AdS 4 analog of Minkowski "memory" effects is derived, but with late-time memory of earlier events being replaced by (holographic) "shadow" effects. Lessons from AdS 4 provide hints for better understanding Minkowski asymptotic symmetries, the 3D structure of its soft limits, and Minkowski holography.

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Section: Jhep01(2018)014mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asymptotic symmetries, holography and topological hair

Mishra¹,

Sundrum²

2018

J. High Energ. Phys.

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“…Memory effects caused by electromagnetic fields were further discussed in [4] and later connected to asymptotic symmetries of four-dimensional Maxwell's theory, and thus identified as the classical counterparts of soft theorems, in [5,6]. See also [7,8].…”

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confidence: 99%

Electromagnetic and color memory in even dimensions

2019

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We explore memory effects associated to both Abelian and non-Abelian radiation getting to null infinity, in arbitrary even spacetime dimensions. Together with classical memories, linear and non-linear, amounting to permanent kicks in the velocity of the probes, we also discuss the higher-dimensional counterparts of quantum memory effects, manifesting themselves in modifications of the relative phases describing a configuration of several probes. In addition, we analyse the structure of the asymptotic symmetries of Maxwell's theory in any dimension, both even and odd, in the Lorenz gauge.

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“…Three processes can turn on the field C AB and trigger an observable displacement memory effect: a variation of the Bondi mass aspect M (ordinary memory effect), a burst of gravitational waves controlled by the news N AB (Christodoulou effect), or a burst of null matter (null memory effect) [13]. The analogous memory effects can also be established in electrodynamics (electromagnetic memory effect) [149,150] and in Yang-Mills theory (color memory effect) [148] where a field is turned on as a result of a burst of energy passing through the region of interest, leading to an observable phenomenon. Notice that other memory effects have been identified in gravity [69,[151][152][153][154][155][156][157], including the spin memory effect and the refraction memory effect.…”

Section: Memory Effectsmentioning

confidence: 99%

Asymptotic Symmetries in the Gauge fixing Approach and the BMS group

Ruzziconi¹

2020

Proceedings of XV Modave Summer School in Mathematical Physics — PoS(Modave2019)

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These notes are an introduction to asymptotic symmetries in gauge theories, with a focus on general relativity in four dimensions. We explain how to impose consistent sets of boundary conditions in the gauge fixing approach and how to derive the asymptotic symmetry parameters. The different procedures to obtain the associated charges are presented. As an illustration of these general concepts, the examples of fourdimensional general relativity in asymptotically (locally) (A)dS 4 and asymptotically flat spacetimes are covered. This enables us to discuss the different extensions of the Bondi-Metzner-Sachs-van der Burg (BMS) group and their relevance for holography, soft gravitons theorems, memory effects, and black hole information paradox. These notes are based on lectures given at the XV Modave Summer School in Mathematical Physics.

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Asymptotic symmetries and electromagnetic memory

Cited by 117 publications

References 27 publications

Asymptotic symmetries, holography and topological hair

Asymptotic symmetries, holography and topological hair

Electromagnetic and color memory in even dimensions

Asymptotic Symmetries in the Gauge fixing Approach and the BMS group

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