242 research outputs found
Constraints on Higher Derivative Operators in Maximally Supersymmetric Gauge Theory
Following the work of Dine and Seiberg for SU(2), we study the leading
irrelevant operators on the moduli space of N=4 supersymmetric SU(N) gauge
theory. These operators are argued to be one-loop exact, and are explicitly
computed.Comment: 6 pages, harvmac. Note added. (Only a subset of the leading
irrelevant operators have been shown to be one-loop exact.
Supersymmetry Breaking and Inflation from Higher Curvature Supergravity
The generic embedding of the higher curvature theory into old-minimal
supergravity leads to models with rich vacuum structure in addition to its
well-known inflationary properties. When the model enjoys an exact R-symmetry,
there is an inflationary phase with a single supersymmetric Minkowski vacuum.
This appears to be a special case of a more generic set-up, which in principle
may include R-symmetry violating terms which are still of pure supergravity
origin. By including the latter terms, we find new supersymmetry breaking vacua
compatible with single-field inflationary trajectories. We discuss explicitly
two such models and we illustrate how the inflaton is driven towards the
supersymmetry breaking vacuum after the inflationary phase. In these models the
gravitino mass is of the same order as the inflaton mass. Therefore, pure
higher curvature supergravity may not only accommodate the proper inflaton
field, but it may also provide the appropriate hidden sector for supersymmetry
breaking after inflation has ended.Comment: 41 pages, 21 figures, published versio
Ricci-flat supertwistor spaces
We show that supertwistor spaces constructed as a Kahler quotient of a
hyperkahler cone (HKC) with equal numbers of bosonic and fermionic coordinates
are Ricci-flat, and hence, Calabi-Yau. We study deformations of the
supertwistor space induced from deformations of the HKC. We also discuss
general infinitesimal deformations that preserve Ricci-flatness.Comment: 13 pages, references and comments adde
Topological twisted sigma model with H-flux revisited
In this paper we revisit the topological twisted sigma model with H-flux. We
explicitly expand and then twist the worldsheet Lagrangian for bi-Hermitian
geometry. we show that the resulting action consists of a BRST exact term and
pullback terms, which only depend on one of the two generalized complex
structures and the B-field. We then discuss the topological feature of the
model.Comment: 16 pages. Appendix adde
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