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8 papers

hep-th2026

Multi-rotating black holes with non-aligned angular momenta in 5D Kaluza-Klein theory

Shinya Tomizawa, Hideo Furugori, Jun-ichi Sakamoto +1

The paper derives an exact multi‑centered solution for rotating black holes with non‑aligned angular momenta in 5‑dimensional Kaluza‑Klein theory, which reduces to a 4‑dimensional…

hep-th2026

Multi--black holes in Bertotti--Robinson spacetime

Hideo Furugori, Jun-ichi Sakamoto, Shinya Tomizawa

We construct a new class of exact solutions describing multi-black holes in the Bertotti--Robinson spacetime, using the monodromy-matrix formalism associated with integrable sigma…

hep-th2026

Monodromy-Matrix Description of Extremal Multi-centered Black Holes

Jun-ichi Sakamoto, Shinya Tomizawa

We study solution-generating techniques based on the Breitenlohner--Maison linear system for extremal, stationary biaxisymmetric black hole solutions in five-dimensional s…

hep-th2026

Multi-centered Myers-Perry Black Holes in Five Dimensions

Shinya Tomizawa, Jun-ichi Sakamoto, Ryotaku Suzuki

We present a new family of multi-centered rotating black hole solutions in 5D vacuum Einstein gravity, providing explicit examples of cohomogeneity-three spacetimes. It is well kno…

hep-th2025

Monodromy-Matrix Description of Doubly Rotating Black Rings

Jun-ichi Sakamoto, Shinya Tomizawa

Extending the single-angular-momentum case analyzed in our previous work, we investigate the solution-generating technique based on the Breitenlohner-Maison (BM) linear system for…

hep-th2025

Description of Non-Spherical Black Holes in 5D Einstein Gravity via the Riemann-Hilbert Problem

Jun-ichi Sakamoto, Shinya Tomizawa

We investigate the solution-generating technique based on the Breitenlohner-Maison (BM) linear system, for asymptotically flat, stationary, bi-axisymmetric black hole solutions wit…