302 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
"Induced" N=4 conformal supergravity
We consider an abelian N=4 super Yang-Mills theory coupled to background N=4
conformal supergravity fields. At the classical level, this coupling is
invariant under global SU(1,1) transformation of the complex ("dilaton-axion")
supergravity scalar combined with an on-shell vector-vector duality. We compute
the divergent part of the corresponding quantum effective action found by
integrating over the super Yang-Mills fields and demonstrate its SU(1,1)
invariance. This divergent part related to the conformal anomaly is one-loop
exact and should be given by the N=4 conformal supergravity action containing
the Weyl tensor squared term. This allows us to determine the full non-linear
form of the bosonic part of the N=4 conformal supergravity action which has
manifest SU(1,1) invariance.Comment: 13 pages. v2: minor misprints corrected; v3: note added about missed
terms in the actio
One-loop effective potential in generic chiral superfield model
We obtain the one-loop quantum corrections to the K\"ahlerian and
superpotentials in the generic chiral superfield model on the
nonanticommutative superspace. Unlike all previous works, we use a method which
does not require to rewrite a star-product of superfields in terms of ordinary
products. In the K\"ahlerian potential sector the one-loop contributions are
analogous to ones in the undeformed theory while in the chiral potential sector
the quantum corrections contain a deformation parameter.Comment: LaTeX, 9 pages, Typos correcte
Attenuation of the Langat tick-borne flavivirus by chimerization with mosquito-borne flavivirus dengue type 4
- …