The non-perturbative tag has no wiki summary.
4
votes
2answers
96 views
What constitutes a 'reliable' instanton calculation?
In Modern Supersymmetry, John Terning, on pgs 151, and 153 performs a so called 'reliable' instanton calculation when dealing with the ADS superpotential 'since the gauge group is completely broken'. ...
2
votes
4answers
169 views
Is there a non-perturbative remormalization? If so, how does it work?
Is there a method to renormalize a theory without using perturbative expansions for the divergences? For example, is there a method to get masses and other renormalized quantities without using ...
7
votes
1answer
219 views
What's the relation between perturbative and nonperturbative QFT?
In case of any miscommunication let me describe my understanding of the meaning of "perturbative" and "non-perturbative", and correct me if something is wrong:
In a perturbatively defined QFT the ...
4
votes
2answers
222 views
What does a non-perturbative theory mean?
I'm a science writer and I'm having difficulty understanding what a non-perturbative approach means. I thought I understood what perturbative meant, but in looking for explanations of ...
9
votes
1answer
218 views
Instantons, anomalies, and 1-loop effects
A symmetry is anomalous when the path-integral measure does not respect it. One way this manifests itself is in the inability to regularize certain diagrams containing fermion loops in a way ...
10
votes
3answers
397 views
How do we know that nonperturbative canonical quantum gravity is wrong?
In these forums and elsewhere it is routinely agreed that "we do not have a theory of quantum gravity." My question is, how do we know that canonical quantum gravity is "wrong"? I understand that the ...
3
votes
0answers
253 views
Is there a Non-perturbative renormalization algorithm? [duplicate]
Possible Duplicate:
is there non-perturbative RENORMALIZATION ?? if so how it works?
Is there a non-perturbative renormalization algorithm ???, for example to avoid the divergent integrals ...
5
votes
2answers
138 views
Advanced topics in string theory
I'm looking for texts about topics in string theory that are "advanced" in the sense that they go beyond perturbative string theory. Specifically I'm interested in
String field theory (including ...
3
votes
1answer
153 views
Do people confuse all-order perturbation theory with non-perturbative physics in QFT?
I've heard about people talking about the 1/N expansion as a mothod of nonperturbative QCD. This seems strange. In the 1/N expansion all you have is Feynman diagrams, which are by definition ...
3
votes
1answer
225 views
String matrix models with c>1
Question 1: What is the status of string random matrix models (~ triangulated random surfaces) with c>1?
In my limited search, I have just come across a few papers by Frank Ferrari (in 2000-2002) on ...
22
votes
6answers
2k views
Formalizing Quantum Field Theory
I'm wondering about current efforts to provide mathematical foundations and more solid definition for quantum field theories. I am aware of such efforts in the context of the simpler topological or ...
2
votes
1answer
294 views
Perturbative solution + Nonperturbative solution = Full solution?
I am having this silly confusion! Suppose I have a system (a Hamiltonian or an action say) and also suppose I have a perturbation parameter present (say only one in sight) in there, using which I can ...
