Supertranslation Goldstone and de Sitter Tachyons
Abstract
Supertranslation Goldstone lies in certain "exceptional series" representations of SL(2,C). Interestingly, m2=-3 scalar tachyon in three dimensional de Sitter space also lies in the same representation. In this note, we analyze these theories, focusing on representation-theoretical aspects, and emphasize that "modulo certain polynomials", there is a unitary representation of the corresponding symmetry group.
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