6 comments

[ 4.0 ms ] story [ 28.2 ms ] thread
Nice lecture about Dirac.

If you prefer to read, this 1939 paper by Dirac is a characteristically lucid discussion of similar themes:

The Relation between Mathematics and Physics [PDF]

http://mcs.une.edu.au/~pmth213/PapersOfInterest/Paul%20Dirac...

This has the perfect qoutation for the well known fact of the Galileo->Lorentz group overthrow from an indisputable source:

"The theory of relativity introduced mathematical beauty to an unprecedented extent into the description of Nature. The restricted theory { 1905 } changed our ideas of space and time in a way that may be summarised by stating that the group of transformations to which the space-time continuum is subject must be changed from the Galilean group to the Lorentz group. The latter group is a much more beautiful thing than the former - in fact, the former would be called mathematically a degenerate special case of the latter { c->∞ }. The general theory of relativity { 1915 } involved another step of a rather similar character" { diffeomorphism group/category }. I came to think lately that much of the basic groups in physics, Lorentz and gauge, have all more or less rotatory features.

Wonderful talk. I now have some reading material for the next week :)
(comment deleted)