“…We argue that the Gopakumar-Vafa interpretation of the topological string partition function can be used to compute and resum certain non-perturbative brane instanton effects of type II CY compactifications. …”
Enlace del recurso
Enlace del recurso

“…We calculate the Voros symbols, or quantum periods, in four different ways: Borel summation of the WKB series, direct computation of Wronskians of exponentially decaying solutions, the TBA equations of Gaiotto-Moore-Neitzke/Gaiotto, and instanton counting. We make computations by all of these methods, finding good agreement. …”
Enlace del recurso
Enlace del recurso

“…The O(g^2) value found in this way is in agreement with previous results. We also find that instanton contributions to the above correlators vanish. …”
Enlace del recurso
Enlace del recurso

“…We compute exact 2- and 3-point functions of chiral primaries in four-dimensional N=2 superconformal field theories, including all perturbative and instanton contributions. We demonstrate that these correlation functions are nontrivial and satisfy exact differential equations with respect to the coupling constants. …”
Enlace del recurso
Enlace del recurso

“…This book introduces recent concepts and achievements with particular emphasis on a dynamical formulation and relations to specific systems in mesoscopic, molecular, and atomic physics. Advanced instanton techniques, e.g. for decay rates and tunnel splittings, are discussed in the first part. …”
Enlace del recurso
Enlace del recurso

“…Our results disfavour the theta behaviour of the vacuum energy predicted by instanton models, while they are compatible with the expectation from the large Nc expansion.…”
Enlace del recurso
Enlace del recurso

“…The preferred value of the shift, noted previously in other contexts, restores the Z_2 symmetry of the instanton partition function under inversion of the Omega-background, and removes the extension. …”
Enlace del recurso

“…The solution of the U(1) problem and the vacuum structure in QCD are obtained without recourse to the problematic semiclassical instanton approximation, by rather exploiting the topology of the gauge group.…”
Enlace del recurso
Enlace del recurso

“…We also point out how the eleven-dimensional Planck scale arises in the classical 0-brane solution, as well as the ten-dimensional Planck scale in the D-instanton solution.…”
Enlace del recurso
Enlace del recurso

“…We study the non-perturbative, instanton-corrected effective action of the N=2 SU(2) x SU(2) supersymmetric Yang-Mills theory with a massless hypermultiplet in the bifundamental representation. …”
Enlace del recurso
Enlace del recurso

“…We include the effects of instanton-induced interactions and study the mass pattern of the pseudoscalar mesons. …”
Enlace del recurso
Enlace del recurso

“…The effect is manifested in the existence of an instanton configuration contributing to the vacuum expectation value of the Higgs field. …”
Enlace del recurso

“…In particular, we show how to explicitly determine the low energy quantum effective action for G=SU(3) from the underlying hyperelliptic Riemann surface, and calculate the leading instanton corrections. This is done by solving Picard-Fuchs equations and asymptotically evaluating period integrals. …”
Enlace del recurso
Enlace del recurso

“…Sum rules, chiral perturbation theory and the formulation of QCD on a lattice are some of the tools used to test models, like the stochastic vacuum, the instanton liquid or the consideration of monopoles in the vacuum to produce dual superconductivity and confinement. …”
Enlace del recurso

“…Two models developed for the description of duality violations are considered in some detail: one is instanton-based, another resonance-based. The mechanisms they represent are complementary. …”
Enlace del recurso
Enlace del recurso

“…In this novel approach, the initial singularity of space-time corresponds to a 0 size singular gravitational instanton, characterised by a Riemannian metric configuration (++++) in dimension D = 4. …”
Enlace del recurso

“…Mirror symmetry of the four-fold computes non-perturbative corrections to mirror symmetry on the three-folds, including D-instanton corrections. We also propose a physical interpretation for the observation by Warner that relates the deformation spaces of certain matrix factorizations and the periods of non-compact 4-folds that are ALE fibrations.…”
Enlace del recurso
Enlace del recurso

“…This matrix model complements the instanton soliton picture of holographic baryons, whose small size turned out to be well below the natural length scale of the approximation involved there. …”
Enlace del recurso
Enlace del recurso

“…When formulated in twistor space, the D-instanton corrected hypermultiplet moduli space in N=2 string vacua and the Coulomb branch of rigid N=2 gauge theories on $R^3 \times S^1$ are strikingly similar and, to a large extent, dictated by consistency with wall-crossing. …”
Enlace del recurso
Enlace del recurso

“…Correspondingly a system of coupled instanton equations emerges mixing gravitational and Yang--Mills instantons with triholomorphic hyperinstantons and axion-instantons. …”
Enlace del recurso
Enlace del recurso