منابع مشابه
General effective actions.
We investigate the structure of the most general actions with symmetry group G, spontaneously broken down to a subgroup H . We show that the only possible terms in the Lagrangian density that, although not G-invariant, yield G-invariant terms in the action, are in one to one correspondence with the generators of the fifth cohomology classes. For the special case of G = SU(N)L × SU(N)R broken do...
متن کاملEffective Actions near Singularities
We study the heterotic string compactified on K3× T 2 near the line T = U , where the effective action becomes singular due to an SU(2) gauge symmetry enhancement. By ‘integrating in’ the light W± vector multiplets we derive a quantum corrected effective action which is manifestly SU(2) invariant and non-singular. This effective action is found to be consistent with a residual SL(2,Z) quantum s...
متن کاملHighly Effective Actions
It is conjectured that the world-volume action of a probe D3-brane in an AdS5 × S background of type IIB superstring theory, with one unit of flux, can be reinterpreted as the exact effective action (or highly effective action) for U(2) N = 4 super Yang-Mills theory on the Coulomb branch. An analogous conjecture for U(2)k×U(2)−k ABJM theory is also presented. The main evidence supporting these ...
متن کاملConsistency of Wilsonian effective actions
Wilsonian effective actions are interpreted as free energies in ensembles with prescribed field expectation values and prescribed connected two-point functions. Since such free energies are directly obtained from two-particle-irreducible functionals, it follows that Wilsonian effective actions satisfy elementary perturbative consistency conditions, and non-perturbative convexity conditions. In ...
متن کاملEffective actions with fixed points.
The specific form of the constant term in the asymptotic expansion of the heat-kernel on an axially-symmetric space with a codimension two fixed-point set of conical singularities is used to determine the conformal change of the effective action in four dimensions. Another
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ژورنال
عنوان ژورنال: ATZ worldwide
سال: 2020
ISSN: 2192-9076
DOI: 10.1007/s38311-020-0215-z