Editing Paul Dirac (section)

===Gravity===
Dirac quantised the gravitational field.<ref name="Cern Courier-2002" /><ref name=Debnath/> His work laid the foundations for [[canonical quantum gravity]].<ref>{{Cite thesis |last=Schick |first=Michael |title=Canonical Quantum Gravity |date=2021 |publisher=Imperial College London |url=https://www.imperial.ac.uk/media/imperial-college/research-centres-and-groups/theoretical-physics/msc/dissertations/2021/Michael-Schick-Dissertation.pdf |degree=}}</ref> 
In his 1959 lecture at the [[Lindau Nobel Laureate Meetings|Lindau Meetings]], Dirac discussed why [[gravitational wave]]s have "physical significance".<ref>{{Cite news |last=Skuse |first=Ben |date=1 September 2022 |title=Black Holes - Topic {{!}} Lindau Mediatheque |url=https://mediatheque.lindau-nobel.org/topics/black-holes |access-date=2 November 2023 |website=Lindau Nobel Mediatheque |language=en}}</ref> Dirac predicted gravitational waves would have well defined energy density in 1964.<ref name=Debnath>{{Cite journal |last=Debnath |first=Lokenath |author-link=Lokenath Debnath |date=2013 |title=A short biography of Paul A. M. Dirac and historical development of Dirac delta function |url=http://www.tandfonline.com/doi/abs/10.1080/0020739X.2013.770091 |journal=International Journal of Mathematical Education in Science and Technology |language=en |volume=44 |issue=8 |pages=1201–1223 |doi=10.1080/0020739X.2013.770091 |bibcode=2013IJMES..44.1201D |s2cid=121423215 |issn=0020-739X}}</ref> Dirac reintroduced the term "[[graviton]]" in a number of lectures in 1959, noting that the energy of the gravitational field should come in quanta.<ref>{{harvnb|Farmelo|2009|pp=367–368}}</ref><ref>{{Cite journal |last=Debnath |first=Lokenath |date=2013 |title=A short biography of Paul A. M. Dirac and historical development of Dirac delta function |url=http://www.tandfonline.com/doi/abs/10.1080/0020739X.2013.770091 |journal=International Journal of Mathematical Education in Science and Technology |language=en |volume=44 |issue=8 |pages=1201–1223 |doi=10.1080/0020739X.2013.770091 |bibcode=2013IJMES..44.1201D |s2cid=121423215 |issn=0020-739X}}</ref>