# $L_\infty$ algebras for extended geometry Paper in proceedings, 2018

Extended geometry provides a unified framework for double geometry, exceptional geometry, etc., i.e., for the geometrisations of the string theory and M-theory dualities. In this talk, we will explain the structure of gauge transformations (generalised diffeomorphisms) in these models. They are generically infinitely reducible, and arise as derived brackets from an underlying Borcherds superalgebra or tensor hierarchy algebra. The infinite reducibility gives rise to an L∞structure, the brackets of which have universal expressions in terms of the underlying superalgebra.

## Author

#### Martin Cederwall

Chalmers, Physics, Theoretical Physics

#### Jakob Palmkvist

Chalmers, Physics, Theoretical Physics

Group32
Prague, Czech Republic,

#### Beyond space and time

Swedish Research Council (VR), 2016-01-01 -- 2019-12-31.

#### Subject Categories

Algebra and Logic

Geometry

Theoretical Chemistry

Basic sciences