“…Similar to the beauty events, instanton or instanton-induced events involving heavy flavour can also be a source for non-isolated, both like- and unlike-sign muon pairs. …”
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“…In particular, the small instanton transition for which a tensor multiplet is traded for 29 hypermultiplets is explicitly demonstrated. …”
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“…Our solution gives an explicit description of the geometry in the core of Nekrasov and Witten's realization of the instanton partition function, far from the asymptotic region of their background. …”
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“…Topics covered include the relations between mass densities, charge densities and the preservation of unbroken supersymmetry; interpolating-soliton structure; diagonal and vertical Kaluza-Klein reduction families; multiple-charge solutions and the four D=11 elements; duality-symmetry multiplets; charge quantisation; low-velocity scattering and the geometry of worldvolume supersymmetric $\sigma$-models; and the target-space geometry of BPS instanton solutions obtained by the dimensional reduction of static $p$-branes.…”
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“…Flat coordinates, an N=1 mirror map for chiral multiplets and the exact instanton corrected superpotential are obtained from the periods of a system of differential equations. …”
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“…In Calabi-Yau string vacua, such theta series encode instanton corrections from $k$ Neveu-Schwarz five-branes. …”
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“…We find contributions that can be interpreted as 't Hooft anomalies involving the 1-form symmetry which originate from a fractionalization of the instanton number of non-Abelian gauge theories in F-/M-theory compactifications to 8d/7d and 6d/5d.…”
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“…In the supersymmetric case this is done by adapting Witten's index to the present situation, and in the nonsupersymmetric case by studying the dependence of energy levels on the instanton angle. We find that regularizations which restore supersymmetry at high energies seem to preserve Theta-smoothness whereas nonsupersymmetric asymptotically free theories seem to violate it. …”
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“…In particular they examine the case of a Yang-Mills theory and of a four-dimensional nonlinear sigma model, both coupled to 'strong gravitation'. Instanton, meron and multimeron configurations are obtained and their properties discussed. (25 refs).…”
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“…We use this connection to determine the instanton effects that control the large order behavior of topological string theory on these backgrounds.…”
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“…I begin with the axionic instanton and related solutions of bosonic and heterotic string theory. …”
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“…In the dual heterotic string on T^6, the amplitudes describe non-perturbative gravitational corrections due to bound states of fivebrane instantons with heterotic world-sheet instantons. We argue, as a consequence, that our results give information about instanton configurations in six dimensional Sp(2k) gauge theories on T^6.…”
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“…<!--HTML-->Instantons I am starting my fourth and final year of MPhys at Durham University, United Kingdom, in theoretical physics. …”
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“…The type IIA result is then used to predict the full, non- perturbative correction to the heterotic effective action. We determine the instanton numbers and the Olive-Montonen duality groups. (34 refs).…”
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“…The redefinition of matter fields can be read directly from the perturbative Yukawa couplings, whereas closed string moduli redefinitions are obtained from D-brane instanton superpotential couplings. The resulting expressions reproduce and generalize, in the presence of internal magnetic fields, previous results in the literature.…”
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“…The bubbling terms arise from residues of specific instanton sectors of 5d line operators in this context.…”
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“…Thus, the BCFT fixed points appear to carry two-fold geometrical information: on the one hand they probe the boundary of the instanton moduli space on K3, on the other hand they probe discrete torsion in D-geometry.…”
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“…At one-loop this is familiar from instanton physics, but we find that at two-loop the role of the zero modes, and the interplay between IR and UV effects in the renormalization, is quite different. …”
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“…For each case, the complete structure of Borel singularities is exactly determined, and the relation of these singularities with the large-order behavior of (multi-instanton) perturbative expansions is made fully precise.…”
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“…By including also a bulk axion (dual to an instanton density of the holographic QFT), we consider the interplay of the self-tuning mechanism and the Electroweak symmetry breaking on the universe brane. …”
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