| Foreword | p. xiii |
| Preface | p. xv |
| Notation | p. xviii |
| A first look at strings | p. 1 |
| Why strings? | p. 1 |
| Action principles | p. 9 |
| The open string spectrum | p. 16 |
| Closed and unoriented strings | p. 25 |
| Exercises | p. 30 |
| Conformal field theory | p. 32 |
| Massless scalars in two dimensions | p. 32 |
| The operator product expansion | p. 36 |
| Ward identities and Noether's theorem | p. 41 |
| Conformal invariance | p. 43 |
| Free CFTs | p. 49 |
| The Virasoro algebra | p. 52 |
| Mode expansions | p. 58 |
| Vertex operators | p. 63 |
| More on states and operators | p. 68 |
| Exercises | p. 74 |
| The Polyakov path integral | p. 77 |
| Sums over world-sheets | p. 77 |
| The Polyakov path integral | p. 82 |
| Gauge fixing | p. 84 |
| The Weyl anomaly | p. 90 |
| Scattering amplitudes | p. 97 |
| Vertex operators | p. 101 |
| Strings in curved spacetime | p. 108 |
| Exercises | p. 118 |
| The string spectrum | p. 121 |
| Old covariant quantization | p. 121 |
| BRST quantization | p. 126 |
| BRST quantization of the string | p. 131 |
| The no-ghost theorem | p. 137 |
| Exercises | p. 143 |
| The string S-matrix | p. 145 |
| The circle and the torus | p. 145 |
| Moduli and Riemann surfaces | p. 150 |
| The measure for moduli | p. 154 |
| More about the measure | p. 159 |
| Exercise | p. 164 |
| Tree-level amplitudes | p. 166 |
| Riemann surfaces | p. 166 |
| Scalar expectation values | p. 169 |
| The bc CFT | p. 176 |
| The Veneziano amplitude | p. 178 |
| Chan-Paton factors and gauge interactions | p. 184 |
| Closed string tree amplitudes | p. 192 |
| General results | p. 198 |
| Exercises | p. 204 |
| One-loop amplitudes | p. 206 |
| Riemann surfaces | p. 206 |
| CFT on the torus | p. 208 |
| The torus amplitude | p. 216 |
| Open and unoriented one-loop graphs | p. 222 |
| Exercises | p. 229 |
| Toroidal compactification and T-duality | p. 231 |
| Toroidal compactification in field theory | p. 231 |
| Toroidal compactification in CFT | p. 235 |
| Closed strings and T-duality | p. 241 |
| Compactification of several dimensions | p. 249 |
| Orbifolds | p. 256 |
| Open strings | p. 263 |
| D-branes | p. 268 |
| T-duality of unoriented theories | p. 277 |
| Exercises | p. 280 |
| Higher order amplitudes | p. 283 |
| General tree-level amplitudes | p. 283 |
| Higer genus Riemann surfaces | p. 290 |
| Sewing and cutting world-sheets | p. 294 |
| Sewing and cutting CFTs | p. 300 |
| General amplitudes | p. 305 |
| String field theory | p. 310 |
| Large order behavior | p. 315 |
| High energy and high temperature | p. 317 |
| Low dimensions and noncritical strings | p. 322 |
| Exercises | p. 327 |
| A short course on path integrals | p. 329 |
| Bosonic fields | p. 329 |
| Fermionic fields | p. 341 |
| Exercises | p. 345 |
| References | p. 347 |
| Glossary | p. 359 |
| Index | p. 389 |
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