Quantum Theory Looks at Time Travel
Abstract
We introduce a quantum mechanical model of time travel which includes two figurative beam splitters in order to induce feedback to earlier times. This leads to a unique solution to the paradox where one could kill one's grandfather in that once the future has unfolded, it cannot change the past, and so the past becomes deterministic. On the other hand, looking forwards towards the future is completely probabilistic. This resolves the classical paradox in a philosophically satisfying manner.
 Publication:

Quo Vadis Quantum Mechanics?
 Pub Date:
 2005
 DOI:
 10.1007/3540266690_4
 arXiv:
 arXiv:quantph/0506027
 Bibcode:
 2005qvqm.book...63G
 Keywords:

 Physics;
 Quantum Physics
 EPrint:
 This paper contains minor changes to our paper published as Chapter 4 of Quo Vadis Quantum Mechanics?, ed. by A. Elitzur, S. Dolev and N. Kolenda, Springer Verlag, Berlin (2005). It is an expanded version of D.M. Greenberger and K. Svozil, in: Between Chance and Choice, ed. by H. Atmanspacher and R. Bishop, Imprint Academic, Thorverton England (2002), pp. 293308. Two references added