Black Hole Perturbations and Holography

Contribution List

4. Analytic thermal bootstrap meets holography

Deniz Bozkurt (DESY)

Poster

I will present the analytical bootstrap approach to thermal holographic two-point functions, based on the interplay between their analytic structure, the Kubo–Martin–Schwinger (KMS) condition, and multi–stress tensor OPE coefficients determined from the dual AdS description. The analysis focuses on two-point functions of identical scalar operators with integer conformal dimensions at zero...

7. Integrability and gravity interplay: the Mathieu case (with a perspective on more realistic ones)

Dr Francesco Olivi

Poster

Inspired by integrability techniques and combinatorial results we propose a method to write exact solutions of the Modified Mathieu equation. The method is an unified approach in the sense that it can be used to write both Floquet and Decaying (in integrability, IN and OUT in gravity) solutions. The same approach can be used for the Heun (confluent) equations in order to make contact with GW...

9. Near-extremal hydrodynamics and the holographic product formula

Edwan Préau (Utrecht University)

I will discuss the recently introduced holographic product formula in the context of near-extremal hydrodynamics, which corresponds to the regime of energy ω, momentum k and temperature T much smaller than a hard scale μ.
I will explain how this formula determines the general form taken by holographic spectral functions in this regime. This form simplifies in the extremal limit T ≪ ω, k ≪ μ,...

5. On the gravitational multipole structures from scattering amplitudes in higher dimensions

Francesco Campanella

Poster

The study of scattering amplitudes in arbitrary dimensions reveals new properties in the minimal interaction between spinning matter and gravity. As we know from spinor helicity formalism, in four dimensions the universality of the spin interaction leads to the Kerr Black-Hole multipole structure. To set up the computation in higher dimensions, we first analyze in four dimensions the...

2. One-loop corrections of near-extremal WAdS3

Emilie Despontin

Poster

Extending recent findings of a $T^{3/2}$ dependence in the partition function of the deformed throat geometry of near-extremal BTZ, once quantum fluctuations are included, we compute one-loop quantum corrections to near-extremal warped AdS$_3$ black holes in topologically massive gravity. We find a characteristic $T^2$ scaling in the low temperature partition function, expressing the one-loop...

12. test

tests

3. Thermal Bootstrap and Holography

Ivan Gusev (Trinity College Dublin)

Poster

Thermal two-point functions in holographic CFTs are constrained by the periodicity of Euclidean time (KMS) and analyticity. Starting from the computable stress-tensor sector, we use these conditions to determine the missing double-trace part and reconstruct the full correlator. Using KMS sum rules and Padé–Borel resummation, we obtain concrete predictions for double-trace thermal coefficients,...

8. To Bounce or Not to Bounce

Samuel Valach

Poster

I will present new insights into bouncing geodesics, their role as probes of curvature singularities, and their interpretation in the finite-temperature dual theory.

6. Towards Quadratic Quasi-Normal Modes of Black Holes

Alba Grassi (CERN and Université de Genève), Daniele Mauri, Massimo Bianchi, Massimo Bianchi (Universita degli Studi di Roma Tor Vergata)

Poster

Although linear perturbations of black hole solutions have been studied in great detail, much less is known about quadratic fluctuations. In this work, we take a step forward in this direction by first analyzing simple toy models — the Inverted Hydrogen Atom in four-dimensional Minkowski spacetime and pure AdS — where we construct closed-form solutions for quadratic perturbations. We then turn...