Author

Osamu Fukushima

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Preprint Sep 2026

A gravitational realization of Courant--Hilbert deformations

Courant--Hilbert (CH) deformations unify broad classes of solvable stress-tensor flows including $T\bar{T}$ and root-$T\bar{T}$. However, a gravitational action that systematically yields such general deformations has remained unknown. In this Letter, we construct a two-dimensional massive gravity theory whose on-shell...

Osamu Fukushima, Miyabi Kurihara, Takaki Matsumoto et al. · 1 citation

Preprint Aug 2026

Machine-Learning Search for Lax Connections

We apply a machine learning framework to search for Lax connections in two-dimensional non-linear sigma models using local current data. For the $SU(2)$ principal chiral model and the symmetric coset $S^2 = SU(2)/U(1)$, the method successfully recovers the full spectral-parameter families without using the known spectr...

Osamu Fukushima, Tomohiro Shigemura, Ryosuke Suda et al. · 1 citation