How to build a time machine

Paul Davies

Research output: Contribution to journalArticle


This article provides information on time machines. For decades, time travel lay beyond the fringe of respectable science. In recent years, however, the topic has become something of a cottage industry among theoretical physicists. Understanding the relation between cause and effect is a key part of attempts to construct a unified theory of physics. If unrestricted time travel were possible, even in principle, the nature of such a unified theory could be drastically affected.
Original languageEnglish
Pages (from-to)14-19
Number of pages6
JournalScientific American
Issue number1
Publication statusPublished - 2006


  • time travel
  • space and time
  • science fiction
  • physics theory

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