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- W4308288257 abstract "The Cayley transform compactifies Minkowski space $M$, realized as self-adjoint $2times2$ complex matrices following Penrose, as the unitary group $U(2)$. Its complement is a compactification of a copy of a light-cone as it is usually drawn, constructed by adjoining a bubble or $CP_1$ of unitary matrices with eigenvalue $pm 1$ at the ends of a lightcone at infinity. The Brauer-Wall group of $U(2)$ (i.e. of fields of certain kinds of graded $Cs$-algebras, up to projective equivalence) is $Z_2 times Z$, defining an interesting class of nontrivial examples of Araki-Haag-Kastler backgrounds for quantum field theories on compactified Minkowski space. The second part of this paper extends such models to link presentations of more general spin four-manifolds." @default.
- W4308288257 created "2022-11-10" @default.
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- W4308288257 date "2021-11-15" @default.
- W4308288257 modified "2023-09-28" @default.
- W4308288257 title "At the boundary of Minkowski space" @default.
- W4308288257 doi "https://doi.org/10.48550/arxiv.2111.08053" @default.
- W4308288257 hasPublicationYear "2021" @default.
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