Quantum Gravity & Holography
AdS/CFT, the black-hole information problem and islands, entanglement and the emergence of spacetime, and de Sitter quantum gravity.
Most influential
- Non-Fermi liquids from holography
We report on a potentially new class of non-Fermi liquids in (2+1)-dimensions. They are identified via the response functions of composite fermionic operators in a class of strongly interacting quantum field theories at finite density, computed using the AdS/CFT correspondence. We find strong evidence of Fermi surfaces: gapless fermionic excitations at discr…
Article487 citationsarXiv:0903.2477doi:10.1103/physrevd.83.065029 - Entanglement of purification: from spin chains to holography
Purification is a powerful technique in quantum physics whereby a mixed quantum state is extended to a pure state on a larger system. This process is not unique, and in systems composed of many degrees of freedom, one natural purification is the one with minimal entanglement. Here we study the entropy of the minimally entangled purification, called the entan…
Article240 citationsarXiv:1709.07424doi:10.1007/jhep01(2018)098 - An Information Paradox and Its Resolution in de Sitter Holography
We formulate a version of the information paradox in de Sitter spacetime and show that it is solved by the emergence of entanglement islands in the context of the DS/dS correspondence; in particular, the entanglement entropy of a subregion obeys a time-dependent Page curve. Our construction works in general spacetime dimensions and keeps the graviton massles…
Article144 citationsarXiv:2103.07477doi:10.1103/physrevd.103.126004 - Surface/state correspondence as a generalized holography
We propose a new duality relation between codimension two space-like surfaces in gravitational theories and quantum states in dual Hilbert spaces. This surface/state correspondence largely generalizes the idea of holography such that we do not need to rely on any existence of boundaries in gravitational spacetimes. The present idea is motivated by the recent…
Article184 citationsarXiv:1503.03542doi:10.1093/ptep/ptv089 - The Black Hole Information Problem
The black hole information problem has been a challenge since Hawking's original 1975 paper. It led to the discovery of AdS/CFT, which gave a partial resolution of the paradox. However, recent developments, in particular the firewall puzzle, show that there is much that we do not understand. I review the black hole, Hawking radiation, and the Page curve, and…
Article147 citationsarXiv:1609.04036doi:10.1142/9789813149441_0006 - Global symmetry, Euclidean gravity, and the black hole information problem
In this paper we argue for a close connection between the non-existence of global symmetries in quantum gravity and a unitary resolution of the black hole information problem. In particular we show how the essential ingredients of recent calculations of the Page curve of an evaporating black hole can be used to generalize a recent argument against global sym…
Article95 citationsarXiv:2010.10539doi:10.1007/jhep04(2021)175 - Mass, Entropy and Holography in Asymptotically de Sitter Spaces
We propose a novel prescription for computing the boundary stress tensor and charges of asymptotically de Sitter (dS) spacetimes from data at early or late time infinity. If there is a holographic dual to dS spaces, defined analogously to the AdS/CFT correspondence, our methods compute the (Euclidean) stress tensor of the dual. We compute the masses of Schwa…
Article409 citationsarXiv:hep-th/0110108doi:10.1103/physrevd.65.123508 - BCFT and Islands in two dimensions
By combining the AdS/BCFT correspondence and the brane world holography, we expect an equivalence relation between a boundary conformal field theory (BCFT) and a gravitational system coupled to a CFT. However, it still remains unclear how the boundary condition of the BCFT is translated in the gravitational system. We examine this duality relation in a two-d…
Article83 citationsarXiv:2202.08462doi:10.1007/jhep06(2022)095 - Localization & exact holography
A bstract We consider the AdS 2 /CFT 1 holographic correspondence near the horizon of big four-dimensional black holes preserving four supersymmetries in toroidally compactified Type-II string theory. The boundary partition function of CFT 1 is given by the known quantum degeneracies of these black holes. The bulk partition function is given by a functional …
Abstract excerpt by Atish Dabholkar A et al., CC-BY, https://doi.org/10.1007/jhep04(2013)062; truncated.
Article103 citationsdoi:10.1007/jhep04(2013)062 - Conceptual Aspects of Gauge/Gravity Duality
We give an introductory review of gauge/gravity duality, and associated ideas of holography, emphasising the conceptual aspects. The opening Sections gather the ingredients, viz. anti-de Sitter spacetime, conformal field theory and string theory, that we need for presenting, in Section 5, the central and original example: Maldacena's AdS/CFT correspondence. …
Article90 citationsarXiv:1509.09231doi:10.1007/s10701-016-0037-4 - Black hole elasticity and gapped transverse phonons in holography
We study the elastic response of planar black hole (BH) solutions in a simple class of holographic models with broken translational invariance. We compute the transverse quasi-normal mode spectrum and the propagation speed of the lowest energy mode. We find that the speed of the lowest mode relates to the BH rigidity modulus as dictated by elasticity theory.…
Article87 citationsarXiv:1708.08477doi:10.1007/jhep01(2018)129 - Entanglement Island and Page Curve in Wedge Holography
Entanglement islands play an essential role in the recent breakthrough in resolving the black hole information paradox. However, whether entanglement islands can exist in massless gravity theories is controversial. It is found that entanglement islands disappear in the initial model of wedge holography with massless gravity on the brane. As a result, the ent…
Article33 citationsarXiv:2301.06285doi:10.1007/jhep03(2023)214 - Gravitational quasinormal modes for Anti-de Sitter black holes
Quasinormal mode spectra for gravitational perturbations of black holes in four dimensional de Sitter and anti-de Sitter space are investigated. The anti-de Sitter case is relevant to the ADS-CFT correspondence in superstring theory. The ADS-CFT correspondence suggests a prefered set of boundary conditions.
Article157 citationsarXiv:gr-qc/0201016doi:10.1088/0264-9381/19/8/319 - Massless Entanglement Islands in Cone Holography
It is controversial whether entanglement islands can exist in massless gravity theories. Recently, it is found that the massless entanglement island appears in wedge holography with DGP gravity on the branes. In this paper, we generalize the discussions to the codim-n holography named cone holography. For simplicity, we focus on the case with a codim-2 E bra…
Article30 citationsarXiv:2303.10958doi:10.1007/jhep06(2023)056 - A Half de Sitter Holography
A long-standing and intriguing question is: does the holographic principle apply to cosmologies like de Sitter spacetime? In this work, we consider a half dS spacetime wherein a timelike boundary encloses the bulk spacetime, presenting a version of de Sitter holography. By analyzing the holographic entanglement entropy in this space and comparing it with tha…
Article33 citationsarXiv:2306.07575doi:10.1007/jhep10(2023)137
Newest work
- Photon Rings and Mass-Independent Observables of a Five-Dimensional Charged AdS Black HolePreprintarXiv:2610.40069
- Twinor Theory: Field Equations from $(A)dS_4^{\mathbb C}$ Spin-Tractors: A Twin to Twistor Theory Modelled on $(A)dS_4^{\mathbb C}$PreprintarXiv:2610.40435
- On Geometric Observables in GravityPreprintarXiv:2610.40615
- Holography and localization in fractional field theoryPreprintarXiv:2610.38806
- Gravitational Reconstruction in $AdS_{4}$PreprintarXiv:2610.38887
- Are Black Hole and Cosmological Horizon Thermodynamics Necessarily Inequivalent?PreprintarXiv:2610.39048
- Testing Conformal Weyl Gravity with Plasma Modified Black Hole Shadows and EHT ConstraintsPreprintarXiv:2610.36562
- The Disordered Universe 2025: Statistical Systems Out of EquilibriumPreprintarXiv:2610.36997
- Can One Hear the Absence of a Singularity?PreprintarXiv:2610.37028
- The Disordered Universe 2025: Features in a $Λ>0$ UniversePreprintarXiv:2610.37117