List of inserts Preface 1 Overview and overture 1.1 The classical dynamics of geometry 1.2 Gravitons and photons 1.3 Beyond classical gravity: perturbative strings 1.4 Beyond perturbative strings: branes 1.5 The quantum dynamics of geometry 1.6 Things to do in the meantime 1.7 On with the show 2 Relativistic strings 2.1 Motion of classical point particles 2.2 Classical bosonic strings 2.3 Quantised bosonic strings 2.4 The sphere, the plane and the vertex operator 2.5 Chan-Paton factors 2.6 Unoriented strings 2.7 Strings in curved backgrounds 2.8 A quick look at geometry 3 A closer look at the world-sheet 3.1 Conformal invariance 3.2 Revisiting the relativistic string 3.3 Fixing the conformal gauge 3.4 The closed string partition function 4 Strings on circles and T-duality 4.1 Fields and strings on a circle 4.2 T-duality for closed strings 4.3 A special radius: enhanced gauge symmetry 4.4 The circle partition function 4.5 Toriodal compactifications 4.6 More on enhanced gauge symmetry 4.7 Another special radius: bosonisation 4.8 String theory on an orbifold 4.9 T-duality for open strings: D-branes 4.10 D-brane collective coordinates 4.11 T-duality for unoriented strings: orientifolds 5 Background fields and world-volume actions 5.1 T-duality in background fields 5.2 A first look at the D-brane world-volume action 5.3 The Dirac-Born-Infeld action 5.4 The action of T-duality 5.5 Non-Abelian extensions 5.6 D-branes and gauge theory 5.7 BPS lumps on the world-volume 6 D-brane tension and boundary states 6.1 The D-brane tension 6.2 The orientifold tension 6.3 The boundary state formalism 7 Supersymmetric strings 7.1 The three basic superstring theories 7.2 The two basic heterotic string theories 7.3 The ten dimensional supergravities 7.4 Heterotic toroidal compactifications 7.5 Superstring toroidal compactification 7.6 A superstring orbifold: discovering the K3 manifold 8 Supersymmetric strings and T-duality 8.1 T-duality of supersymmetric strings 8.2 D-branes as BPS solitons 8.3 The D-brane charge and tension 8.4 The orientifold charge and tension 8.5 Type I from type IIB, revisited 8.6 Dirac charge quantisation 8.7 D-branes in type I 9 World-volume curvature couplings 9.1 Tilted D-branes and branes within branes 9.2 Anomalous gauge couplings 9.3 Characteristic classes and invariant polynomials 9.4 Anomalous curvature couplings 9.5 A relation to anomalies 9.6 D-branes and K-theory 9.7 Further non-Abelian extensions 9.8 Further curvature couplings 10 The geometry of D-branes 10.1 A look at black holes in four dimensions 10.2 The geometry of D-branes 10.3 Probing p-brane geometry with Dp-branes 10.4 T-duality and supergravity solutions 11 Multiple D-branes and bound states 11.1 Dp and Dp from boundary conditions 11.2 The BPS bound for the Dp-Dp' system 11.3 Bound states of fundamental strings and D-strings 11.4 The three-string junction 11.5 Aspects of D-brane bound states 12 Strong coupling and string duality 12.1 Type IIB/type IIB duality 12.2 SO(32) Type I/heterotic' duality 12.3 Dual branes from 10D string-string duality 12.4 Type IIA/M-theory duality 12.5 Es x Es heterotic string/M-theory duality 12.6 M2-branes and M5-branes 12.7 U-duality 13 D-branes and geometry I 13.1 D-branes as probes of ALE spaces 13.2 Fractional D-branes and wrapped D-branes 13.3 Wrapped, fractional and stretched branes 13.4 D-branes as instantons 13.5 D-branes as monopoles 13.6 The D-brane dielectric effect 14 K3 orientifolds and compactification 14.1 ZN orientifolds and Chan-Paton factors 14.2 Loops and tadpoles for ALE ZM singularities 14.3 Solving the tadpole equations 14.4 Closed string spectra 14.5 Open string spectra 14.6 Anomalies for N=1 in six dimensions 15 D-branes and geometry II 15.1 Probing p with D(p-4) 15.2 Probing six-branes: Kaluza-Klein monopoles and M-theory 15.3 The moduli space of 3D supersymmetric gauge theory 15.4 Wrapped branes and the enhangon mechanism 15.5 The consistency of excision in supergravity 15.6 The moduli space of pure glue in 3D 16 Towards M- and F-theory 16.1 The type IIB string and F-theory 16.2 M-theory origins of F-theory 16.3 Matrix theory 17 D-branes and black holes 17.1 Black hole thermodynamics 17.2 The Euclidean action calculus 17.3 D=5 Reissner-NordstrSm black holes 17.4 Near horizon geometry 17.5 Replacing T4 with K3 18 D-branes, gravity and gauge theory 18.1 The AdS/CFT correspondence 18.2 The correspondence at finite temperature 18.3 The correspondence with a chemical potential 18.4 The holographic principle 19 The holographic renormalisation group 19.1 Renormalisation group flows from gravity 19.2 Flowing on the Coulomb branch 19.3 An N=1 gauge dual RG flow 19.4 An N=2 gauge dual RG flow and the enhangon 19.5 Beyond gravity duals 20 Taking stock References Index