Take a Ride on a Time Machine
Earman (John), Smeenk (Christopher) & Wuthrich (Christian)
Source: PhilSci Archive website
Paper - Abstract

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Author’s Abstract

  1. We discuss the possibility to build and operate a time machine1, a device that produces closed timelike curves (CTCs).
  2. We specify the spacetime structure needed to implement a time machine2 and assess attempted no-go results against time machines3 in classical general relativity, semi-classical quantum gravity, quantum field theory on curved spacetime, and in Euclidean quantum gravity.
  3. Such no-go theorems for time machines4 would show that, under physically reasonable conditions, CTCs cannot develop in spacetimes initially free of these pathologies.
  4. Our review indicates that an investigation of the prospects of achieving no-go results has not been entirely successful in establishing such generality.
  5. At the same time, the pursuit of chronology protection results has proved to be a fruitful way to probe the foundations of classical GTR and the interface between general relativity and quantum field theory.

Contents
  1. Introduction
  2. Review of time travel5
  3. Operating a time machine6
  4. No-go results for time machines7 in classical GTR
  5. No-go results using semi-classical quantum gravity
  6. No-go results from quantum field theory on curved spacetime
  7. No-go results from Euclidean quantum gravity
  8. Conclusion

Comment:

Text Colour Conventions (see disclaimer)

  1. Blue: Text by me; © Theo Todman, 2018
  2. Mauve: Text by correspondent(s) or other author(s); © the author(s)



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