My professor wants to give me (and another kid) a problem in quantum cosmology. To that end, he asked me to read through his recent paper that appeared in the Physical Review Letters. He said that I should be able to go through it since all the paper employs is (quantum) scalar field theory, which you have been doing as part of your studying QFT in the summer. I, however, upon looking at the paper am clearly stmped as I can't make a word out of it. To me, it seems heavy on GR and a lot of other stuff I haven't done. Please let me know what do you think is the average amount of pre-requsite knowldge to go through the paper. I think my professor seemed to have rushed into giving me this paper: ArXiv link: http://arxiv.org/pdf/1508.07664v2.pdf PRL link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.061302 Thanks!