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Feb
12
awarded  Nice Answer
Feb
11
awarded  Nice Answer
Feb
3
awarded  Announcer
Feb
3
answered Haag's theorem and practical QFT computations
Feb
2
answered twistor-spacetime correspondence
Feb
2
comment How could spacetime become discretised at the Planck scale?
@qftme: i didn't mean to bury you in refs, sorry if i gave that impression. But your questions were so 'open ended' that i didn't know a better way to address them (but to point you towards more comprehensive papers).
Feb
2
answered Your favorite Physics/Astrophysics blogs?
Feb
2
answered How could spacetime become discretised at the Planck scale?
Feb
2
comment Give a description of Loop Quantum Gravity your grandmother could understand
@Marek: that's exactly right: the term "loops" come precisely from this decomposition in terms of Ashtekar variables and how they relate to Wilson loops, etc. In this sense, i think it's very fitting that both, String Theory and LQG, hinge on the same object: flux algebras. ;-) (Glad to be back! :-)
Feb
2
answered How do we resolve operator ordering ambiguities when quantizing generic nonlinear second-class constraints?
Feb
2
answered Give a description of Loop Quantum Gravity your grandmother could understand
Dec
9
awarded  Precognitive
Nov
25
comment Can special relativity be deduced from $E=mc^2$?
@David: I had the low speed expansion in mind when i made the comment above — of course, the case where $p = 0$ is contained in this expansion. ;-)
Nov
25
answered Correspondence principle
Nov
24
answered Can special relativity be deduced from $E=mc^2$?
Nov
23
comment Introductions to discrete space-time
@mtrencseni: Yup. But, i think you can understand CDTs as a Discrete Differential Geometry endowed with a Causal Structure. So, in the sense of "reducing to the basics", i think it'd be best to understand what it means to discretize geometrical objects (eg, Diff Forms), and then add causality to the mix.
Nov
23
comment Why is it hopeless to view differential geometry as the limit of a discrete geometry?
@dmckee @Hans: Discrete Differential Geometry is the name of the game — there's much that can be done.
Nov
23
comment Why is it hopeless to view differential geometry as the limit of a discrete geometry?
@Hans: when you say that $\hbar\rightarrow 0$ recovers classical mechanics, i objected, correct? So, i provided a link to explain the tip of the iceberg behind my objection.
Nov
23
revised Introductions to discrete space-time
added 170 characters in body
Nov
23
comment Why is it hopeless to view differential geometry as the limit of a discrete geometry?
@Hans: you can look for decoherence in quantum mechanics and also Bose-Einstein condensates, etc.