The Taming of Closed Time-like Curves

  title={The Taming of Closed Time-like Curves},
  author={Rahul Biswas and Esko Keski-Vakkuri and Robert G. Leigh and Sean Robert Nowling and Eric J. Sharpe},
We formulate QFT on a R/Z2 orbifold, in a manner which is invariant under the Z2 time and space reversal. This is a background with closed time-like curves. It is also relevant for the elliptic interpretation of de Sitter space. We calculate the one-loop vacuum expectation value of the stress tensor in the invariant QFT, and show that it does not diverge at… CONTINUE READING