214 research outputs found
Application of symbol-operator technique for effective action computation
In the present talk we briefly demonstrate an elegant and effective technique
for calculation of the trace expansion in the derivatives of background fields.
One of main advantages of the technique is manifestly (super)symmetrical and
gauge invariant form of expressions on all stages of calculations. Other
advantage is the universality of the calculation method. Some particular
examples and results are presented.Comment: 11 pages, LaTex, Extended version of the talk given at the Fifth
Workshop on Quantum Field Theory under the Influence of External Conditions,
Leipzig, 10-15 Sept. 200
Construction of 6D supersymmetric field models in N=(1,0) harmonic superspace
We consider the six dimensional hypermultiplet, vector and tensor multiplet
models in (1,0) harmonic superspace and discuss the corresponding superfield
actions. The actions for free (2,0) tensor multiplet and for interacting
vector/tensor multiplet system are constructed. Using the superfield
formulation of the hypermultiplet coupled to the vector/tensor system we
develop an approach to calculation of the one-loop superfield effective action
and find its divergent structure.Comment: 32 pages; v4: Published versio
Leading low-energy effective action in the 6D hypermultiplet theory on a vector/tensor background
We consider a six dimensional (1,0) hypermultiplet model coupled to an
external field of vector/tensor system and study the structure of the
low-energy effective action of this model. Manifestly a (1,0) supersymmetric
procedure of computing the effective action is developed in the framework of
the superfield proper-time technique. The leading low-energy contribution to
the effective action is calculated.Comment: 12 pages, minor correction
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