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quant-ph1998
Time Machines and the Breakdown of Unitarity
Frank Antonsen, Karsten Bormann
We present a generic way of thinking about time machines from the view of a far away observer. In this model the universe consists of three (or more) regions: One containing the en…
quant-ph1998
Zeta-Functions and Star-Products
Frank Antonsen
We use the definition of a star (or Moyal or twisted) product to give a phasespace definition of the -function. This allows us to derive new closed expressions for the coefficie…