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arXiv · 2610.23382

Quasi-derivations of the (extended) Schrödinger--Witt algebras

Ivan Kaygorodov·Abror Khudoyberdiyev·Zarina Shermatova
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Abstract

The Schrödinger--Witt algebras are infinite-dimensional Lie algebras of local dynamical symmetries of the free Schrödinger equation; they contain the Witt algebra of conformal transformations of the time line and appear in non-equilibrium statistical physics and in non-relativistic conformal field theory. We describe all quasi-derivations of the original and the twisted Schrödinger--Witt algebras. We prove that every quasi-derivation is the sum of a derivation, a trivial $\frac12$-derivation, a linear map with values in the center, and a finite linear combination of maps from three new families of quasi-derivations. As corollaries, we describe all $δ$-derivations, all $δ$-biderivations and all transposed $δ$-Poisson structures of the Schrödinger--Witt algebras. Finally, we prove that every quasi-derivation of the (original or twisted) extended Schrödinger--Witt algebra is the sum of an inner derivation and a multiple of the identity map. As a consequence, there are no nontrivial $δ$-derivations (for $δ\notin \{\frac12,1\}$), $δ$-biderivations (for $δ\neq1$), and transposed $δ$-Poisson structures on these algebras.

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Ivan Kaygorodov, Abror Khudoyberdiyev, Zarina Shermatova. 2026-10-16. Quasi-derivations of the (extended) Schrödinger--Witt algebras. https://arxiv.org/abs/2610.23382

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