Determinants, pfaffians and quasi-free state representations of the CAR algebra

Mauro Spera, Tilmann Wurzbacher

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this paper we apply the theory of quasi-free states of CAR algebras and their Bogolubov automorphisms to give an alternative C*algebraic construction of the determinant and pfaffian line bundles discussed by Pressley-Segal and by Borthwick. The basic property of the pfaffian of being the holomorphic square root of the determinant bundle (after restriction to the isotropic grassmannian) is derived from a Fock-anti-Fock correspondence and an application of the Powers-Stormer purification procedure. A Borel-Weil type description of the infinite dimensional Spin^c-representation is discussed, via a Shale-Stinespring implementation of Bogolubov transformations.
Original languageEnglish
Pages (from-to)705-721
Number of pages17
JournalReviews in Mathematical Physics
Publication statusPublished - 1998


  • Hilbert space grassmannian, CAR algebra, determinant and pfaffian bundles


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