new stuff with Bob Wald on stability of black holes to axisymmetric electromagnetic perturbations
OK everyone, back to work. Quantum Gravity is not going to figure itself out!
In which signature is the “conservation of convention law” stated?
‘I know, I’ll use Latex macros’ Now you have two problems (also see
https://xkcd.com/208/ and https://xkcd.com/927/)
hopefully you are using the maths convention — phi_^* for pullback since it is a “dual map”
there are worse convention-violations in GR; signature, Riemann tensor, extrinsic curvature… comparatively this is not a big deal!
because it is consistent with the index positions for objects being pulled-back, forms, vs objects being pushed-forward, vectors.
lot of awesome number theory here — primes, factorisation, Gaussian primes, character functions — pretty neat!
I never realised that you can get all Pythagorean triples from complex numbers!
“but much to say about humanity”
nice thoughts on Minority Report and Artificial Intelligence. Sci-fi is best when it is not about the technology but about humans.
nice demonstration of equilibrium and stability.
Bob Wald’s advice on doing science: Drink lots of coffee and talk to people. #apsapril
this video by @TheeNerdwriter summarises everything that I disliked about Interstellar… and yes I am a physicist.