2,220 reputation
418
bio website azimuthproject.org/azimuth/…
location Munich, Germany
age 39
visits member for 3 years, 2 months
seen Jun 20 '13 at 19:28

I'm a physics graduate working as an IT-developer and -consultant.


Jan
7
comment Analog Hawking radiation
FWIF John Baez had a blog post over at Azimuth about this topic: johncarlosbaez.wordpress.com/2011/11/28/liquid-light
Oct
10
comment Quantum Field Theory from a mathematical point of view
If I had to guess I'd say that "vague and speculative" may be considered to be "polemical". I remember writing something along these lines two years ago at the nCafe :-) (golem.ph.utexas.edu/category/2009/10/…)
Oct
7
comment Extensions of DHR superselection theory to long range forces
Thanks for the tip! I am curious about Bucholz's conlcusion "Origin of infrared difficulties can be traced back to unreasonable idealization of observations covering all of Minkowski space". I remember asking about this idealization in all QFT calculations in an introductory class, but had no idea that this would reappier in such a context :-)
Sep
28
comment Extensions of DHR superselection theory to long range forces
Well, that's a good start :-) But I'll leave the question open for now.
Sep
26
comment Status of local gauge invariance in axiomatic quantum field theory
@Urs, thanks, so a better question to ask would be how to classify nets coming from certain quantization procedures of gauge theories, or maybe to classify gauge theories which produce Haag-Kastler nets. BTW, I think it is also possible to chat in certain chat rooms here, which would be - maybe - easier for a longer conversation like the one that happened here.
Sep
23
comment Status of local gauge invariance in axiomatic quantum field theory
Well, maybe, but how? But please note that the question is not "do we need local gauge symmetry" but "do we need local gauge symmetry in the framework of AQFT", with the latter being somewhat more precise than the former.
Sep
23
comment Status of local gauge invariance in axiomatic quantum field theory
Ok, maybe I should explain my own viewpoint of what AQFT is: That it should be able to describe the same phenomena as the standard model.
Sep
16
comment Significance of the hyperfinite $III_1$ factor for axiomatic quantum field theory
Feel free to expand you answer later, even though I will accept it already.
Sep
16
comment Significance of the hyperfinite $III_1$ factor for axiomatic quantum field theory
Ok, I somehow missed that paper, although Yngvason is on my watch list :-)
May
10
comment spectral function
Please try <a href="math.stackexchange.com/">math stackexchange</a> for math problems and add both the equations and your definition of "spectral function" to your post over there :-)
Feb
28
comment Recommendations for good Newtonian mechanics and kinematics books
+1: The Feynman lectures are for college freshmen taking their first class in classical mechanics and go from there. You'll find both a nice exposition of basic topics and will get a feeling for the enthusiasm of Feynman for physics: Why it is exciting and worthwhile to study.
Feb
16
comment Time evolution in quantum mechanics
Is the question about the differentiability of exponential functions of operators? Or about the definition of exponential functions of operators? Or what can be done with the "formal" solution to get more information about the time dependent behaviour of the system?
Feb
15
comment Number of dimensions in string theory and possible link with number theory
Sorry for being off-topic, but I thought the relationship I mention interesting enough in the given context in its own right.
Feb
14
comment What is the status of applying numerical analysis to QM/QFT problems
A good start place to start is Heinz J. Rothe: "Lattice gauge theories. An introduction."
Feb
13
comment Why is there a search for an exchange particle for gravity?
@Daniel: Indirect evidence for gravitational wave emmision: yes. The existence of gravitational waves is not identical to the existence of gravitons, there is one additional conceputal step (gravitational waves exhibit particle wave duality in the quantum realm with the graviton being the particle). It's not one and the same concept.
Feb
12
comment Does string theory provide quantitative experimental predictions?
"Extra Dimensions" is not an (Gedanken-)experiment, an Gedankenexperiment would be "what would we see if we had a magnifying glass for the Planck scale" (no extra dimensions, I'd guess, because photons ignore those).
Feb
12
comment Does string theory provide quantitative experimental predictions?
What are the predictions on the Planck scale?
Feb
12
comment Does string theory provide quantitative experimental predictions?
This question is a duplicate, voting to close.
Feb
12
comment What is the 4th dimension?
Dear Cameron, this question will be answered in any introductory class to physics, which means that it is not appropriate for this site, which is for students and researchers (see faq). In case you are not a student of physics: there are a lot of nice introductions to special relativity for non-experts, like N. David Mermin:"Space and Time in Special Relativity". I'm voting to close.
Feb
12
comment CFTs and formalizing quantum field theory
@Matt: Yes, vertex algebras formalize 2d CFTs. I assume you allude to the work of Connes-Kreimer on renormalization? That seems to be widely ignored by physicists - just like AQFT :-)