And now for something not completely different: an introductory lecture in Perturbative Quantum Gravity (PQG) by Prof. John Donoghue. The lecture is one in the Basics of Quantum Gravity online school sponsored by https://isqg.org/ the International Society for Quantum Gravity. PQG stands in contrast to the approach in the fine article at the top ("TFA") and to semiclassical gravity.
By coincidence a retweet this morning re-surfaced a tweet from a couple of weeks ago by @BahramShakerin linking to these three 2023 lectures in Perturbative Quantum Gravity given a few weeks ago at École Polytechnique Fédérale de Lausanne. This material may be useful to anyone genuinely interested in constructing GR as a "second quantization" QFT, in contrast to the Oppenheim classical gravity - second-quantized quantum matter (CQ) approach whose surface was scratched in the quantamagazine link at the top.
As there are many comments which raised questions or made ... uh ... assertions about things like gravitons, there is probably some interest here, thus this comment. Additionally, problems in semiclassical gravity and in perturbative quantum gravity motivated the work discussed in TFA.
By coincidence a retweet this morning re-surfaced a tweet from a couple of weeks ago by @BahramShakerin linking to these three 2023 lectures in Perturbative Quantum Gravity given a few weeks ago at École Polytechnique Fédérale de Lausanne. This material may be useful to anyone genuinely interested in constructing GR as a "second quantization" QFT, in contrast to the Oppenheim classical gravity - second-quantized quantum matter (CQ) approach whose surface was scratched in the quantamagazine link at the top.
As there are many comments which raised questions or made ... uh ... assertions about things like gravitons, there is probably some interest here, thus this comment. Additionally, problems in semiclassical gravity and in perturbative quantum gravity motivated the work discussed in TFA.
Lecture outline and links to materials:
https://blogs.umass.edu/grqft/
https://indico.cern.ch/event/1279592/ (pqg PDF links at lower right; links to the lecture notes of related lectures are a little above that).
Lecture notes
https://arxiv.org/abs/1702.00319
Three videos of zoom lectures
https://www.youtube.com/watch?v=ik0C-xTnK-k
https://www.youtube.com/watch?v=lYc6oicfo3U
https://www.youtube.com/watch?v=UOsRyYTwOgs
and finally
Professor Donoghue's page:
https://blogs.umass.edu/donoghue/
Extra credit, `t Hooft's PQG lecture notes: https://webspace.science.uu.nl/~hooft101/lectures/erice02.pd...
The twitter thread is:
https://twitter.com/BahramShakerin/status/166874044067626189...
PS: QG2023 (by ISQG) runs yesterday (10 July) until 14 July, see https://www.youtube.com/@isqg423 for live streams and starting here https://indico.imapp.ru.nl/event/106/ for info about the conference.