Compactification , topology change and surgery theory

  title={Compactification , topology change and surgery theory},
  author={Sean A. Hartnoll},
We study the process of compactification as a topology change. It is shown how the mediating spacetime topology, or cobordism, may be simplified through surgery. Within the causal Lorentzian approach to quantum gravity, it is shown that any topology change in dimensions ≥ 5 may be achieved via a causally continuous cobordism. This extends the known result… CONTINUE READING