We study the finite distance boundary symmetry current algebra of the most general first order theory of 3D gravity. We show that the space of quadratic generators contains diffeomorphisms but also a notion of dual diffeomorphisms, which together form either a double Witt or centerless BMS3 algebra. The relationship with the usual asymptotic symmetry algebra relies on a duality between the null and angular directions, which is possible thanks to the existence of the dual diffeomorphisms.
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CITATION STYLE
Geiller, M., & Goeller, C. (2022). Dual diffeomorphisms and finite distance asymptotic symmetries in 3D gravity. Physical Review D, 106(6). https://doi.org/10.1103/PhysRevD.106.064018