An obstacle to building a time machine

Details An obstacle to building a time machine An obstacle to building a time machine

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvl..68..263c&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 68, Jan. 20, 1992, p. 263-266. Research supported by NSF.

Other

44

Gravitational Effects, Relativity, Space-Time Functions, String Theory, Universe, Cosmology, Time

Scientific paper

Gott (1991) has shown that a spacetime with two infinite parallel cosmic strings passing each other with sufficient velocity contains closed timelike curves. An attempt to build such a time machine is discussed. Using the energy-momentum conservation laws in the equivalent (2 + 1)-dimensional theory, the spacetime representing the decay of one gravitating particle into two is explicitly constructed; there is never enough mass in an open universe to build the time machine from the products of decays of stationary particles. More generally, the Gott time machine cannot exist in any open (2 + 1)-dimensional universe for which the total momentum is timelike.

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