Abstract
The purpose of this paper is to shed more light on the transition from the known massless modular action to the wanted massive one in the case of forward light cones and double cones. The infinitesimal generator δm of the modular automorphism group \(\big(\sigma_{\rm m}^t\big)_{t\in\mathbb R}\) is investigated, in particular, some assumptions on its structure are verified explicitly for two concrete examples.
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Saffary, T. On the Generator of Massive Modular Groups. Lett Math Phys 77, 235–248 (2006). https://doi.org/10.1007/s11005-006-0100-8
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DOI: https://doi.org/10.1007/s11005-006-0100-8