Higher Order Fermionic and Bosonic Operators

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Abstract

This paper studies a particular class of higher order conformally invariant differential operators and related integral operators acting on functions taking values in particular finite dimensional irreducible representations of the Spin group. The differential operators can be seen as a generalization to higher spin spaces of kth-powers of the Euclidean Dirac operator. To construct these operators, we use the framework of higher spin theory in Clifford analysis, in which irreducible representations of the Spin group are realized as polynomial spaces satisfying a particular system of differential equations. As a consequence, these operators act on functions taking values in the space of homogeneous harmonic or monogenic polynomials depending on the order. Moreover, we classify these operators in analogy with the quantization of angular momentum in quantum mechanics to unify the terminology used in studying higher order higher spin conformally invariant operators: For integer and half-integer spin, these are respectively bosonic and fermionic operators. Specifically, we generalize arbitrary powers of the Dirac and Laplace operators respectively to spin- 32 and spin-1.

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Ding, C., Walter, R., & Ryan, J. (2019). Higher Order Fermionic and Bosonic Operators. In Trends in Mathematics (pp. 347–380). Springer International Publishing. https://doi.org/10.1007/978-3-030-23854-4_17

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