I recently checked out Davies' and Birrell's book "Quantum fields in curved space" and I noticed that it was written in 1982. My question is, did the authors know about the anomalies and that QFT could not incorporate gravity at that time? The table of contents has nothing on anomalies. I am asking because I don't want to read the book only to get to the end and see they were naive. So another way to pose my question: is the book worth reading, or is there a more modern and accurate perspective modulo string theory?