Daniel

2,568 reputation

416

bio	website	about.me/danieldf
	location	Providence, RI
	age	37
visits	member for	2 years, 6 months
	seen	Feb 22 at 21:12
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Research Faculty at Brown University, Theoretical Physics (hep-th, math-ph, hep-lat, gr-qc).

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	2,568 reputation	bio	website	about.me/danieldf	visits	member for	2 years, 6 months
416 badges		location	Providence, RI		seen	Feb 22 at 21:12

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Nov 3	awarded	Yearling
Jun 8	awarded	Constituent
Jun 8	awarded	Caucus
May 4	awarded	Nice Answer
Nov 3	awarded	Yearling
Oct 11	answered	Other processes than formal power series expansions in quantum field theory calculations
Sep 21	answered	Do Gauge Theories (CFTs) Have Phase Transitions as the 't Hooft Coupling is Varied?
Sep 21	answered	Connections and applications of SLE in physics
Apr 17	comment	Who works professionally on reformulation of QFT? It's very frustrating to sit down and take the time to write a meaningful and relevant answer (including refs to original work), just to get downvoted without a single comment explaining the reasons of such action. Where i come from, this has a very clear name: trolling. Maybe this is the tip-of-the-iceberg of having a question-&-answer site for topics such as Physics: to be trolled by folks that don't understand what's written. :-P
Apr 13	comment	Who works professionally on reformulation of QFT? @Vladimir: regarding your comments about regulators… i think there's something missing, for the VOA (or OPE) uniquely determines the interactions of the theory: this algebraic structure encodes the interactions. What you described above is just a rudimentary way of saying the same thing.
Apr 13	comment	Who works professionally on reformulation of QFT? @Vladimir: I know people trying a few different things, but some (if not most) of them requires much more 'hardcore' math — which you have already dismissed above. In any case, the Clay Institute is offering a big prize for whomever can pull this off…
Apr 13	comment	Who works professionally on reformulation of QFT? @Vladimir: both of your points above — as expressed — have to do with the same question, the so-called UV-completeness of the theory. This, in turn, is related to Renormalization, VOAs, and so on.
Apr 13	answered	Is there something similar to Noether's theorem for discrete symmetries?
Apr 13	comment	Who works professionally on reformulation of QFT? Regarding your first comment above, i explicitly addressed it in my "PS" — in fact, this was the raison d'être for my editing my original answer in order to add the "PS". So, i simply don't understand what you meant. Further, "these points" are not "quite distant" as you seem to think: they are $1/\Lambda$ from each other, where $\Lambda$ is the energy scale of your problem: the more energy, the less apart they are.
Apr 12	revised	Who works professionally on reformulation of QFT? Added new material not mentioned firstly.
Apr 12	answered	Who works professionally on reformulation of QFT?
Apr 3	comment	What are some approaches to discrete space-time used in modern physics? @Deepak: don't sweat it. Living and learning…
Apr 1	comment	What are some approaches to discrete space-time used in modern physics? @Deepak: don't mistake your lack of knowledge for "random facts": the fact that you can't put these arguments together and understand my points says absolutely nothing about their validity (it only speaks about you). It's not my fault you don't know certain aspects of QFT: i even provided a reference that expands on some of my points (on top of giving you more references to clarify further doubts). I have been very honest and forthcoming, but can't fit in ~350 characters what i understand to be the answers you're looking for.
Apr 1	comment	What are some approaches to discrete space-time used in modern physics? @Deepak: "(…) they are as silly as these two." I haven't used adjectives to characterize your comments so far and i'd have appreciated you keeping this discussion at the Physics level. However, i understand your inability to do so, granted that you don't even appreciate what a 'Cauchy problem' is. So, if you want to keep on trolling, go right ahead — i have better things to do.
Mar 31	comment	What are some approaches to discrete space-time used in modern physics? As for your other points, suffices to say that QFTs over curved backgrounds are a hairball. And i would love to see you do QFT over a de Sitter background (as opposed to its more famous cousing, anti-de Sitter): can you define the Cauchy problem for a simple (bosonic, spin 0 — free scalar; or maybe even $\phi^4$) QFT over de Sitter space? If you can do this, would you be able to do very same for Gauge Theories (Yang-Mills)? Maybe our definitions of "frontier research" are slightly different...