Comments on D-Instantons in c<1 Strings

Abstract

We suggest that the boundary cosmological constant ζin c<1 unitary string theory be regarded as the one-dimensional complex coordinate of the target space on which the boundaries of world-sheets can live. From this viewpoint we explicitly construct analogues of D-instantons which satisfy Polchinski's ``combinatorics of boundaries.'' We further show that our operator formalism developed in the preceding articles is powerful in evaluating D-instanton effects, and also demonstrate for simple cases that these effects exactly coincide with the stringy nonperturbative effects found in the exact solutions of string equations.

12 pages with 1 figure, LaTex, Version to appear in PLB

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• On the Chemical Potential of D-instantons in c=0 Noncritical String Theory
• Comments on the D-instanton calculus in (p,p+1) minimal string theory
• Universality of Nonperturbative Effects in c<1 Noncritical String Theory
• Stokes Phenomena and Non-perturbative Completion in the Multi-cut Two-matrix Models
• Notes on the algebraic curves in (p,q) minimal string theory
• A string field theoretical description of (p,q) minimal superstrings
• Stokes Phenomena and Quantum Integrability in Non-critical String/M Theory
• T-duality of ZZ-brane
• Fractional supersymmetric Liouville theory and the multi-cut matrix models
• Macroscopic loop amplitudes in the multi-cut two-matrix models
• Notes on D-branes and dualities in (p,q) minimal superstring theory
• Supermatrix models and multi ZZ-brane partition functions in minimal superstring theories
• Fractional-Superstring Amplitudes, Multi-Cut Matrix Models and Non-Critical M Theory
• Analytic Study for the String Theory Landscapes via Matrix Models
• Tachyon Condensation, Open-Closed Duality, Resolvents, and Minimal Bosonic and Type 0 Strings
• Matrix Model For Polyakov Loops, String Field Theory In The Temporal Gauge, Winding String Condensation In Anti-de Sitter Space And Field Theory Of D-branes
• Duality Constraints on String Theory: Instantons and spectral networks
• Multi-boundary correlators in JT gravity
• Emergent quantum geometry from stochastic random matrices
• Random Matrices, Boundaries and Branes
• Wronskians, dualities and FZZT-Cardy branes