TL;DR
This paper explores the mathematical foundations of higher-spin diffeomorphisms, aiming to define their algebraic structure and clarify their role in higher-spin symmetries and interactions.
Contribution
It compiles existing results and proposes a generalized algebra of differential operators to rigorously define higher-spin diffeomorphisms.
Findings
Collected mathematical results on higher-spin diffeomorphisms
Proposed a generalized algebra for their rigorous definition
Identified challenges and potential directions for future research
Abstract
Higher-spin diffeomorphisms are to higher-order differential operators what diffeomorphisms are to vector fields. Their rigorous definition is a challenging mathematical problem which might predate a better understanding of higher-spin symmetries and interactions. Several yes-go and no-go results on higher-spin diffeomorphisms are collected from the mathematical literature in order to propose a generalisation of the algebra of differential operators on which higher-spin diffeomorphisms are well-defined.
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