- #1
ErikZorkin
- 104
- 6
What is currently the common opinion on Chronology Protection manifested by Hawking almost 30 years ago?
There does not seem to be any fully accepted no-go result for Thornian time machines. Energy conditions can be violated in QFT, semi-classical results suffer from counter-examples, Novikov's and multi-world statements sound too artificial and only try to come around the real issue.
I also didn't see any discussion on the 2nd law of thermodynamics in the works by Visser etc. Does it somehow relate to the problem of causality though?
There does not seem to be any fully accepted no-go result for Thornian time machines. Energy conditions can be violated in QFT, semi-classical results suffer from counter-examples, Novikov's and multi-world statements sound too artificial and only try to come around the real issue.
I also didn't see any discussion on the 2nd law of thermodynamics in the works by Visser etc. Does it somehow relate to the problem of causality though?