Outputs (102)

Cosmology inside a black hole: adding matter on the brane (2025)
Journal Article
Barbón, J. L. F., Patra, A. K., Pedraza, J. F., & Ross, S. F. (2025). Cosmology inside a black hole: adding matter on the brane. Journal of High Energy Physics, 2025(8), Article 124. https://doi.org/10.1007/jhep08%282025%29124

Braneworlds inside an AdS black hole provide simple models where a closed cosmology can be encoded in a dual field theory. Previous studies have focused on pure-tension branes, where the only matter in the cosmology is that dual to the holographic bu... Read More about Cosmology inside a black hole: adding matter on the brane.

Signals of multiparty entanglement and holography (2025)
Journal Article
Balasubramanian, V., Kang, M. J., Murdia, C., & Ross, S. F. (2025). Signals of multiparty entanglement and holography. Journal of High Energy Physics, 2025(6), Article 68. https://doi.org/10.1007/jhep06%282025%29068

We study multiparty entanglement signals, which are functions of a quantum state that are non-zero only when the state has multiparty entanglement. We consider known signals of three- and four-party entanglement, and propose new signals for four- and... Read More about Signals of multiparty entanglement and holography.

A new observable for holographic cosmology (2024)
Journal Article
Chakravarty, J., Maloney, A., Namjou, K., & Ross, S. F. (2024). A new observable for holographic cosmology. Journal of High Energy Physics, 2024(10), Article 184. https://doi.org/10.1007/jhep10%282024%29184

The double-cone geometry is a saddle of the gravitational path integral, which explains the chaotic statistics of the spectrum of black hole microstates. This geometry is the usual AdS-Schwarzschild black hole, but with a periodic identification of t... Read More about A new observable for holographic cosmology.

Supersymmetric solitons in gauged N $$ \mathcal{N} $$ = 8 supergravity (2023)
Journal Article
Anabalón, A., Gallerati, A., Ross, S., & Trigiante, M. (2023). Supersymmetric solitons in gauged N $$ \mathcal{N} $$ = 8 supergravity. Journal of High Energy Physics, 2023(2), Article 55. https://doi.org/10.1007/jhep02%282023%29055

We consider soliton solutions in AdS4 with a flat slicing and Wilson loops around one cycle. We study the phase structure and find the ground state and identify supersymmetric solutions as a function of the Wilson loops. We work in the context of a s... Read More about Supersymmetric solitons in gauged N $$ \mathcal{N} $$ = 8 supergravity.

Cosmologies inside hyperbolic black holes (2022)
Journal Article
Ross, S. F. (2022). Cosmologies inside hyperbolic black holes. Journal of High Energy Physics, 2022(11), Article 168. https://doi.org/10.1007/jhep11%282022%29168

Models with closed FRW cosmologies on the worldvolume of a constant-tension brane inside a black hole provide an interesting setup for studying cosmology holographically. However, in more than two worldvolume dimensions, there are limitations on such... Read More about Cosmologies inside hyperbolic black holes.

Going beyond ER=EPR in the SYK model (2022)
Journal Article
Berkooz, M., Brukner, N., Ross, S. F., & Watanabe, M. (2022). Going beyond ER=EPR in the SYK model. Journal of High Energy Physics, 2022(8), Article 51. https://doi.org/10.1007/jhep08%282022%29051

We discuss generalizations of the TFD to a density matrix on the doubled Hilbert space. We suggest that a semiclassical wormhole corresponds to a certain class of such density matrices, and specify how they are constructed. Different semi-classical p... Read More about Going beyond ER=EPR in the SYK model.

Constraints on cosmologies inside black holes (2022)
Journal Article
Fallows, S., & Ross, S. F. (2022). Constraints on cosmologies inside black holes. Journal of High Energy Physics, 2022(5), Article 094. https://doi.org/10.1007/jhep05%282022%29094

We study the construction of holographic models with closed FRW cosmologies on the worldvolume of a constant-tension brane inside a Schwarzschild-AdS black hole. In dimensions d > 2, having a smooth Euclidean solution where the brane does not self-in... Read More about Constraints on cosmologies inside black holes.

Towards traversable wormholes from force-free plasmas (2022)
Journal Article
Iqbal, N., & Ross, S. F. (2022). Towards traversable wormholes from force-free plasmas. SciPost Physics, 12(3), Article 086. https://doi.org/10.21468/scipostphys.12.3.086

The near-horizon region of magnetically charged black holes can have very strong magnetic fields. A useful low-energy effective theory for fluctuations of the fields, coupled to electrically charged particles, is force-free electrodynamics. The low e... Read More about Towards traversable wormholes from force-free plasmas.

Islands and mixed states in closed universes (2021)
Journal Article
Fallows, S., & Ross, S. F. (2021). Islands and mixed states in closed universes. Journal of High Energy Physics, 2021(7), Article 22. https://doi.org/10.1007/jhep07%282021%29022

We investigate the appearance of islands when a closed universe with gravity is entangled with a non-gravitating quantum system. We use braneworlds in three-dimensional multiboundary wormhole geometries as a model to explore what happens when the non... Read More about Islands and mixed states in closed universes.

Supersymmetric solitons and a degeneracy of solutions in AdS/CFT (2021)
Journal Article
Anabalón, A., & Ross, S. F. (2021). Supersymmetric solitons and a degeneracy of solutions in AdS/CFT. Journal of High Energy Physics, 2021(7), https://doi.org/10.1007/jhep07%282021%29015

We study Lorentzian supersymmetric configurations in D = 4 and D = 5 gauged N = 2 supergravity. We show that there are smooth 1/2 BPS solutions which are asymptotically AdS4 and AdS5 with a planar boundary, a compact spacelike direction and with a Wi... Read More about Supersymmetric solitons and a degeneracy of solutions in AdS/CFT.