-
15/07/2026, 09:30
-
Simon Ross15/07/2026, 09:50
-
Ruth Gregory15/07/2026, 10:00
The C-metric in GR is a fascinating spacetime with a deformed horizon and a cosmic string connecting the black hole to asymptotic infinity meaning the black hole is not isolated. In spite of this, the thermodynamics of these composite solutions is well defined and can even include changes in the string tension as I will show, however the holography of such solutions is a bit more subtle. To...
Go to contribution page -
Alexandre Belin (Universita & INFN, Milano-Bicocca (IT))15/07/2026, 11:30
Euclidean wormholes are understood to encode important non-perturbative information of gravitational physics, coming from the chaotic nature of the dual CFT. In this talk, I will discuss the Lorentzian slicings of such geometries. Slicing a Euclidean geometry, in terms of the path integral, is a method often used to prepare states. In this case, the nature of the state is radically different...
Go to contribution page -
Alex Colling (University of Cambridge)15/07/2026, 14:00
Extremal horizons in a spacetime can be studied through their near-horizon geometry. Building on work by Dunajski and Lucietti, we prove a near-horizon analogue of Hawking’s rigidity theorem: any rotating near-horizon geometry admits a Killing field tangent to the horizon cross-sections. This result holds in spacetimes of arbitrary dimension and with general matter content, assuming only that...
Go to contribution page -
William Chan (University of Pennsylvania)15/07/2026, 14:30
A step towards probing the black hole interior and its structure is being able to detect the black hole microstate. We demonstrate that the Euclidean two-point function of an appropriately chosen probe operator can detect the microstate of an asymptotically AdS black hole. This detection, which requires a tuned, state-dependent choice of probe, is the result of a new gravitational saddle,...
Go to contribution page -
Adam Bac (University of Cambridge)15/07/2026, 15:00
Despite the archetypal status of the BTZ background in quantifying quantum aspects of black holes, several features at low temperatures remain imprecise and incomplete. Here, we systematically investigate the behaviour of the Euclidean path integral at low temperatures in the context of AdS3 supergravity, including an analysis of quantum fluctuations in both the near-horizon and asymptotic...
Go to contribution page -
Leonardo Modesto (Cagliari University)15/07/2026, 16:00
We present a unified (gravity and matter) weakly nonlocal theory unitary, causal, and finite at quantum level in the quantum field theory framework. As a consequence of finiteness, there is no Weyl anomaly and the theory turns out to be conformal invariant at classical as well at quantum level. Therefore, nonlocal quantum gravity is a conformal invariant theory in the spontaneously broken...
Go to contribution page -
Pablo Bueno15/07/2026, 16:30
Resolving spacetime singularities within an effective classical description has motivated two complementary approaches. One is based on nonlocal gravities, which are able to smear localized matter sources over finite regions. The other is based on infinite towers of higher-curvature corrections to the Einstein--Hilbert action belonging to the Quasitopological class, which have recently been...
Go to contribution page -
Harvey Reall (University of Cambridge)16/07/2026, 10:00
The third law of black hole mechanics asserts that it is impossible for a non-extremal black hole to become extremal in finite time (in classical General Relativity). Counterexamples were found recently: gravitational collapse of a massless charged scalar field can produce an exactly extremal Reissner-Nordstrom black hole in finite time, passing through an intermediate phase in which the...
Go to contribution page -
Juan Pedraza (Madrid IFT)16/07/2026, 11:30
Pole-skipping has emerged as a sharp, near-horizon signature
Go to contribution page
of many-body quantum chaos in holography. In this talk, I will
demonstrate how it generalizes to cosmological spacetimes and what it
reveals about the microscopic dynamics of de Sitter horizons. First,
in empty de Sitter and Schwarzschild-de Sitter geometries, I will map
the tower of pole-skipping points for scalar, Maxwell,... -
Aidan McSharry (University of Cambridge)16/07/2026, 14:00
Recently it has been shown that the third law of black hole mechanics can be violated: an exactly extremal Reissner-Nordström black hole can form in finite time in the gravitational collapse of matter with a large charge to mass ratio. However, it has also been proved that this cannot happen if the matter satisfies a “supersymmetric” lower bound on its energy in terms of its charge. In this...
Go to contribution page -
Andrew Rolph (VUB)16/07/2026, 14:30
In this talk, I will discuss the formation, detection and coarse-graining of black holes in AdS/CFT, with an emphasis on the tension between boundary unitarity and the production of mixed state Hawking radiation in the bulk. I will construct CFT states dual to black hole formation and evaporation by colliding bulk particle wavepackets at trans-Planckian energy. I will propose boundary probes...
Go to contribution page -
Ángel Murcia (Instituto de Física Teórica)16/07/2026, 15:00
Chaotic BKL dynamics provides a canonical description of the approach to spacelike singularities as a sequence of Kasner epochs grouped into eras. While this paradigm is well established for cosmological singularities, explicit realizations inside black holes have been scarce, despite renewed interest from holography. Here, we construct a broad class of asymptotically AdS black holes in D ≥ 4...
Go to contribution page -
Victor Franken (Ghent University)16/07/2026, 16:00
The quantum null energy condition (QNEC) is a well-known and proven information-theoretic lower bound on the expectation value of energy density in quantum field theory. The bound can be predicted simply as a consequence of a conjectured quantum gravity principle called the restricted quantum focusing conjecture (RQFC). Here, we show that for conformal field theories in spacetime of dimension...
Go to contribution page -
Thomas Mertens (Ghent University)16/07/2026, 16:30
In this talk, I will construct a definition of diff-invariant bulk observables in lower-dimensional JT gravity. I will use these to define quantum accelerated observers and a generalization of the Unruh effect. After the gravity path integral, this leads to a finite matter thermal entropy of bulk quantum fields. Finally, I will discuss a definition of infalling observers, and derive how...
Go to contribution page -
Sean Hartnoll17/07/2026, 10:00
I will review how the Einstein equations in a near-singularity 'BKL' regime map onto hyperbolic billiard dynamics. Solutions to the Wheeler-DeWitt equation, i.e. the quantum wavefunctions of this system, are thus odd automorphic forms. I will explain how these quantum wavefunctions can be expressed as Green's functions for hopping dynamics on the Bruhat-Tits tree. This suggests a possible...
Go to contribution page -
Johanna Erdmenger (Julius Maximilians University Würzburg)17/07/2026, 11:30
In AdS/CFT holography, two manifestations of the black hole information paradox are given by the nonisometric nature of the bulk-boundary map and by the factorisation puzzle. By considering time-shifted microstates of the eternal black hole, we have demonstrated that both puzzles may be simultaneously resolved by taking into account nonlocal quantum corrections that correspond to wormholes...
Go to contribution page -
Jonathan Karl (University of Würzburg)17/07/2026, 14:00
A central problem in formulating a theory of quantum gravity is to determine the size and structure of the Hilbert space of black holes. Here we use a quantum dynamical Krylov complexity approach to calculate the Hilbert space dimension of a black hole in 2+1-dimensional Anti-de Sitter space. We achieve this by obtaining the spread of an initial thermofield double state over the Krylov basis....
Go to contribution page -
Ming Yang (DAMTP)17/07/2026, 14:30
Near a spacelike singularity, the BKL approximation reduces gravitational dynamics to the motion of logarithmic scale factors in a Lorentzian minisuperspace. In the late-time limit, this becomes a billiard motion on a hyperbolic domain. Quantisation then gives a Wheeler–DeWitt equation which can be interpreted as a Laplace-type spectral problem on the corresponding hyperbolic billiard.
Go to contribution page
This... -
Javier Carballo (University of Southampton)17/07/2026, 15:00
It is well known that quasinormal modes (QNMs) do not form a complete basis for linear black hole perturbations. In particular, retarded Green's functions of black holes can only be decomposed as a convergent sum of QNMs at sufficiently late times. In this talk, I will show that Green's functions can be expanded as a convergent mode sum everywhere in spacetime. When QNMs fail at early times, a...
Go to contribution page -
Matthew Blacker (University of Cambridge)17/07/2026, 16:00
The goal of this talk is to probe the future interior of an eternal AdS black hole. The quantum cosmological future and past interior states of the black hole may be placed on an equal footing to the left and right AdS boundary data by considering the on-shell bulk action as a function of the left/right/future/past data. We call this object a holographic banner, and it obeys the...
Go to contribution page -
Andrew Svesko17/07/2026, 16:30
In this talk I examine four dimensional, near-extremal black holes in the presence of a finite boundary obeying conformal boundary conditions, where the conformal class of the induced metric and the trace of the extrinsic curvature are fixed. Working in Euclidean signature, I will describe the quasi-local gravitational thermodynamics, where the near-extremal regime is dominated by a...
Go to contribution page
Choose timezone
Your profile timezone: