D-Branes, Moduli and Supersymmetry

Abstract

We study toroidal compactifications of Type II string theory with D-branes and nontrivial antisymmetric tensor moduli and show that turning on these fields modifies the supersymmetry projections imposed by D-branes. These modifications are seen to be necessary for the consistency of T-duality. We also show the existence of unusual BPS configurations of branes at angles that are supersymmetric because of conspiracies between moduli fields. Analysis of the problem from the point of view of the effective field theory of massless modes shows that the presence of a 2-form background must modify the realization of supersymmetry on the brane. In particular, the appropriate supersymmetry variation of the physical gaugino vanishes in any constant field strength background. These considerations are relevant for the $E_7$-symmetric counting of states of 4-dimensional black holes in Type II string theory compactified on $T^6$.

LaTeX, minor corrections, version to be published in PRD

References in corpus (21)

• Microscopic Origin of the Bekenstein-Hawking Entropy
• Dirichlet-Branes and Ramond-Ramond Charges
• Bound States Of Strings And $p$-Branes
• D-brane Approach to Black Hole Quantum Mechanics
• Supersymmetry and Attractors
• Branes Intersecting at Angles
• D--branes and Spinning Black Holes
• Counting States of Near-Extremal Black Holes
• Solitonic Strings and BPS Saturated Dyonic Black Holes
• Intersecting M-branes
• Boundary States of D-Branes and Dy-Strings
• Moduli, Scalar Charges, and the First Law of Black Hole Thermodynamics
• Intersecting M-branes as Four-Dimensional Black Holes
• Overlapping Branes in M-Theory
• Entropy of 4D Extremal Black Holes
• Light-cone supersymmetry and D-branes
• E(7) Symmetric Area of the Black Hole Horizon
• Black Holes and U-Duality
• Internal Structure of Black Holes
• On D-Branes and Black Holes in Four Dimensions
• Intersecting M-branes and bound states

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• Standard Model at Intersecting D5-branes: Lowering the String Scale
• Hyper-Kahler manifolds and multiply-intersecting branes
• Intersecting Brane Models of Particle Physics and the Higgs Mechanism
• Four Dimensional Black Hole Microstates: From D-branes to Spacetime Foam
• Long-distance interactions of branes: correspondence between supergravity and super Yang-Mills descriptions
• Charged and Uncharged D-branes in various String Theories
• Geometric Couplings and Brane Supersymmetry Breaking
• Magnetized Four-Dimensional $Z_2\times Z_2$ Orientifolds
• Branes at Angles and Black Holes
• String predictions for near future colliders from one-loop scattering amplitudes around D-brane worlds
• Intersecting brane solutions in string and M-theory
• Constituent Model of Extremal non-BPS Black Holes
• Fermionic Zero Mode and String Creation between D4-Branes at Angles
• Regular BPS black holes: macroscopic and microscopic description of the generating solution
• p-p' System with B-field, Branes at Angles and Noncommutative Geometry
• The open story of the magnetic fluxes
• Gauge thresholds in the presence of oblique magnetic fluxes
• Supersymmetry Enhancement of D-p-branes and M-branes
• Intersecting D-brane Models
• BPS-Saturated Bound States of Tilted P-Branes in Type II String Theory
• Constant field strengths on T^{2n}
• Born-Infeld Actions from Matrix Theory
• From 0-Branes to Torons
• Fluxbrane Inflation
• Non-threshold D-brane bound states and black holes with non-zero entropy
• A D-brane inspired U(3)_CxU(3)_LxU(3)_R model
• Extremal black holes, Holography & Coarse graining
• Abelian and Non-abelian D-brane Effective Actions
• Towards the Classification of Non-Marginal Bound States of M-branes and Their Construction Rules
• Supersymmetric non-linear sigma-models with boundaries revisited
• Gauge sector statistics of intersecting D-brane models
• On gauge couplings and thresholds in Type I Gepner models and otherwise
• Comments on Dirichlet Branes at Angles
• Realization of D4-Branes at Angles in Super Yang-Mills Theory
• Wrapped Branes and Supersymmetry
• Gauge coupling and fermion mass relations in low string scale brane models
• On D-brane interaction & its related properties
• Intersecting Noncommutative D-branes and Baryons in Magnetic Fields
• Contact interactions in low scale string models with intersecting $D6$-branes
• Intersecting Brane World from Type I Compactification
• Evidence for an Algebra of ${\mathbf{G}}_2$ Instantons
• Magnetic Fluxes, NS-NS $B$ Field and Shifts in Four-Dimensional Orientifolds
• Nucleon decay in gauge unified models with intersecting D6-branes
• Towards a supersymmetric non-abelian Born-Infeld theory
• Gauge Unification and Quark Masses in a Pati-Salam Model from Branes
• Unification and fermion mass relations in low string scale D-brane models