Time in quantum gravity
  Quantum gravity--the marriage of quantum physics with general relativity--is bound to contain deep and important lessons for the nature of physical time. Some of these lessons shall be canvassed here, particularly as they arise from quantum general relativity and string theory and related approaches. Of particular interest is the question of which of the intuitive aspects of time will turn out to be fundamental, and which 'emergent' in some sense. 
Nick Huggett and Tiziana Vistarini and Christian Wuthrich
physics.hist-ph gr-qc