Projection operator approach to the quantization of higher spin fields

Tóth, Gábor Zsolt (2013) Projection operator approach to the quantization of higher spin fields. EUROPEAN PHYSICAL JOURNAL C, 73. ISSN 1434-6044

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Abstract

A general method to construct free quantum fields for massive particles of arbitrary defi- nite spin in a canonical Hamiltonian framework is presented. The main idea of the method is as follows: a multicomponent Klein–Gordon field that satisfies canonical (anti)commutation relations and serves as an auxiliary higher spin field is introduced, and the physical higher spin field is obtained by acting on the auxiliary field by a suitable differential operator. This allows the calculation of the (anti)commutation relations, the Green functions and the Feyn- man propagators of the higher spin fields. In addition, canonical equations of motions, which are expressed in terms of the auxiliary variables, can be obtained also in the presence of interactions, if the interaction Hamiltonian operator is known. The fields considered trans- form according to the (n/2, m/2) ⊕ (m/2, n/2) and (n/2, m/2) representations of the Lorentz group.

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