NEW VERSION: https://www.math.tamu.edu/~fulling/ar/matsas1_revision.pdf Dear Steve (to circulate) and all, Steve, I apologize. You are right about averaging the response with respect to the detector states.Please post the new version of the talk with this correction and a number of other clarifications introduced thanks to the many comments received. I also thank you for the intense conversation during the weekend. To all the participants, the changes go from paragraphs 23 to 30 (and an appendix added at the end). The main message of the talk is that "The emission of a Minkowski particle from a UD detector with unresolved inner structure coincides with the one from a structureless scalar source and corresponds to the emission/absorption of a zero-energy Rindler particle to/from the Unruh thermal bath". Please do not hesitate to contact me if there are any other questions. Thank you all George -- George E. A. Matsas Professor of Physics Institute for Theoretical Physics/ São Paulo State University São Paulo State Academy of Science https://urldefense.com/v3/__https://professores.ift.unesp.br/george.matsas/__;!!KwNVnqRv!S2X836NqWKx3iRyOS2f-ucqh7XxWg3lEmImrsU7hzK1Vf2ygS_xDPDI-txJYvinJXJE$ VACUUM is COMPLEX NOTHING is EASY NOTHING is DIFFICULT NOTHING is not NOTHING