How to build a space machine?

Details How to build a space machine? How to build a space machine?

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..458..889k&link_type=abstract

Space technology and applications international forum -1999. AIP Conference Proceedings, Volume 458, pp. 889-894 (1999).

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Special Relativity

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It is widely believed that causality forbids anything to move faster than light. However, recently it has been shown that this fact by itself does not preclude (almost) instantaneous communication (`space machines'). The question discussed in this paper is: what else we need to learn to be able to realize such transport in practice. The answer depends on whether or not the spacetime in which a space machine is created is globally hyperbolic. In the former case the only problem is to find appropriate matter distribution. This `technical' problem, however, may turn out to be fundamental since it is likely that the necessary matter has to be `exotic' (that is its energy density is not everywhere positive). A means for producing exotic matter is known, but in the only specific example for which numerical values were found, this mechanism does not work. In the non-globally hyperbolic case it appears that the matter need not be exotic, but the problem of unpredictability arises instead. We argue that neither of these problems is fatal for space machines and discuss the most promising lines of attack.

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