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Preface xv
Abbreviations xvii
Introduction 1
Prehistory 1
The Case for String Theory 3
A Stringy Historical Perspective 6
Conventions 8
Bibliography 9
Classical String Theory 10
The Point Particle 10
Relativistic Strings 14
Oscillator Expansions 20
Closed strings 20
Open strings 22
The Virasoro constraints 24
Bibliography 26
Exercises 26
Quantization of Bosonic Strings 28
Covariant Canonical Quantization 28
Light-cone Quantization 31
Spectrum of the Bosonic String 32
Unoriented Strings 33
Open strings and Chan-Paton factors 34
Path Integral Quantization 37
Topologically Nontrivial World-sheets 39
BRST Primer 40
BRST in String Theory and the Physical Spectrum 42
Bibliography 46
Exercises 46
Conformal Field Theory 49
Conformal Transformations 49
The case of two dimensions 51
Conformally Invariant Field Theory 52
Radial Quantization 54
Mode Expansions 57
The Virasoro Algebra and the Central Charge 58
The Hilbert Space 59
The Free Boson 60
The Free Fermion 63
The Conformal Anomaly 64
Representations of the Conformal Algebra 66
Affine Current Algebras 69
Free Fermions and O(N) Affine Symmetry 71
Superconformal Symmetry 77
N = (1,0)[subscript 2] superconformal symmetry 77
N = (2,0)[subscript 2] superconformal symmetry 79
N = (4,0)[subscript 2] superconformal symmetry 81
Scalars with Background Charge 82
The CFT of Ghosts 84
CFT on the Disk 86
Free massless bosons on the disk 86
Free massless fermions on the disk 88
The projective plane 90
CFT on the Torus 90
Compact Scalars 93
Modular invariance 97
Decompactification 97
The torus propagator 97
Marginal deformations 98
Multiple compact scalars 98
Enhanced symmetry and the string Brout-Englert-Higgs effect 100
T-duality 101
Free Fermions on the Torus 103
Bosonization 105
"Bosonization" of bosonic ghost system 106
Orbifolds 107
CFT on Other Surfaces of Euler Number Zero 112
CFT on Higher-genus Riemann Surfaces 116
Bibliography 117
Exercises 118
Scattering Amplitudes and Vertex Operators 126
Physical Vertex Operators 128
Calculation of Tree-level Tachyon Amplitudes 130
The closed string 130
The open string 131
The One-loop Vacuum Amplitudes 133
The torus 134
The cylinder 136
The Klein bottle 138
The Mobius strip 138
Tadpole cancellation 139
UV structure and UV-IR correspondence 140
Bibliography 141
Exercises 142
Strings in Background Fields 144
The Nonlinear [sigma]-model Approach 144
The Quest for Conformal Invariance 147
Linear Dilaton and Strings in D < 26 Dimensions 149
T-duality in Nontrivial Backgrounds 151
Bibliography 151
Exercises 152
Superstrings and Supersymmetry 155
N = (1,1)[subscript 2] World-sheet Superconformal Symmetry 155
Closed (Type-II) Superstrings 157
Massless R-R states 159
Type-I Superstrings 162
Heterotic Superstrings 165
Superstring Vertex Operators 168
One-loop Superstring Vacuum Amplitudes 170
The type-IIA/B superstring 170
The heterotic superstring 171
The type-I superstring 171
Closed Superstrings and T-duality 174
The type-II string theories 174
The heterotic string 175
Supersymmetric Effective Actions 175
Anomalies 176
Bibliography 182
Exercises 183
D-branes 187
Antisymmetric Tensors and p-branes 187
Open Strings and T-duality 188
D-branes 191
D-branes and R-R Charges 193
D-instantons 196
D-brane Effective Actions 197
The Dirac-Born-Infeld action 197
Anomaly-related terms 199
Multiple Branes and Nonabelian Symmetry 200
T-duality and Orientifolds 201
D-branes as Supergravity Solitons 205
The supergravity solutions 205
Horizons and singularities 207
The extremal branes and their near-horizon geometry 208
NS[subscript 5]-branes 211
Bibliography 213
Exercises 213
Compactifications and Supersymmetry Breaking 219
Narain Compactifications 219
World-sheet versus Space-time Supersymmetry 223
N = 1[subscript 4] space-time supersymmetry 225
N = 2[subscript 4] space-time supersymmetry 226
Orbifold Reduction of Supersymmetry 228
A Heterotic Orbifold with N = 2[subscript 4] Supersymmetry 231
Spontaneous Supersymmetry Breaking 235
A Heterotic N = 1[subscript 4] Orbifold and Chirality in Four Dimensions 237
Calabi-Yau Manifolds 239
Holonomy 241
Consequences of SU(3) holonomy 242
The CY moduli space 243
N = 1[subscript 4] Heterotic Compactifications 245
The low-energy N = 1[subscript 4] heterotic spectrum 246
K3 Compactification of the Type-II String 247
N = 2[subscript 6] Orbifolds of the Type-II String 250
CY Compactifications of Type-II Strings 252
Mirror Symmetry 253
Absence of Continuous Global Symmetries 255
Orientifolds 256
K3 orientifolds 257
The Klein bottle amplitude 258
D-branes on T[superscript 4]/Z[subscript 2] 260
The cylinder amplitude 263
The Mobius strip amplitude 265
Tadpole cancellation 266
The open string spectrum 267
D-branes at Orbifold Singularities 268
Magnetized Compactifications and Intersecting Branes 271
Open strings in an internal magnetic field 272
Intersecting branes 277
Intersecting D[subscript 6]-branes 278
Where is the Standard Model? 280
The heterotic string 280
Type-II string theory 282
The type-I string 283
Unification 284
Bibliography 286
Exercises 287
Loop Corrections to String Effective Couplings 294
Calculation of Heterotic Gauge Thresholds 296
On-shell Infrared Regularization 301
Evaluation of the threshold 303
Heterotic Gravitational Thresholds 304
One-loop Fayet-Iliopoulos Terms 305
N = 1,2[subscript 4] Examples of Threshold Corrections 309
N = 2[subscript 4] Universality of Thresholds 312
Unification Revisited 315
Bibliography 317
Exercises 317
Duality Connections and Nonperturbative Effects 320
Perturbative Connections 322
BPS States and BPS Bounds 323
Nonrenormalization Theorems and BPS-saturated Couplings 325
Type-IIA versus M-theory 328
Self-duality of the Type-IIB String 331
U-duality of Type-Il String Theory 334
U-duality and bound states 335
Heterotic/Type I Duality in Ten Dimensions 336
The type-I D[subscript 1]-string 339
The type-I D[subscript 5]-brane 341
Further consistency checks 343
M-theory and the E[subscript 8] x E[subscript 8] Heterotic String 344
Unification at strong heterotic coupling 347
Heterotic/Type II Duality in Six Dimensions 348
Gauge symmetry enhancement and singular K3 surfaces 352
Heterotic/type II duality in four dimensions 355
Conifold Singularities and Conifold Transitions 356
Bibliography 362
Exercises 363
Black Holes and Entropy in String Theory 369
A Brief History 369
The Strategy 369
Black-hole Thermodynamics 371
The Euclidean continuation 372
Hawking evaporation and greybody factors 374
The Information Problem and the Holographic Hypothesis 375
Five-dimensional Extremal Charged Black Holes 377
Five-dimensional Nonextremal RN Black Holes 379
The Near-horizon Region 381
Semiclassical Derivation of the Hawking Rate 383
The Microscopic Realization 386
The world-volume theory of the bound state 387
The low-energy SCFT of the D[subscript 1]-D[subscript 5] bound state 389
Microscopic calculation of the entropy 391
Microscopic derivation of Hawking evaporation rates 394
Epilogue 396
Bibliography 398
Exercises 399
The Bulk/Boundary Correspondence 403
Large-N Gauge Theories and String Theory 405
The Decoupling Principle 408
The Near-horizon Limit 409
Elements of the Correspondence 410
Bulk Fields and Boundary Operators 413
Holography 416
Testing the AdS[subscript 5]/CFT[subscript 4] Correspondence 417
The chiral spectrum of N = 4 gauge theory 418
Matching to the string theory spectrum 420
N = 8 five-dimensional gauged supergravity 422
Protected correlation functions and anomalies 422
Correlation Functions 424
Two-point functions 425
Three-point functions 427
The gravitational action and the conformal anomaly 428
Wilson Loops 433
AdS[subscript 5]/CFT[subscript 4] Correspondence at Finite Temperature 436
N = 4 super Yang-Mills theory at finite temperature 436
The near-horizon limit of black D[subscript 3]-branes 438
Finite-volume and large-N phase transitions 440
Thermal holographic physics 443
Spatial Wilson loops in (a version of) QCD[subscript 3] 444
The glueball mass spectrum 446
AdS[subscript 3]/CFT[subscript 2] Correspondence 447
The greybody factors revisited 450
The Holographic Renormalization Group 450
Perturbations of the CFT[subscript 4] 451
Domain walls and flow equations 452
A RG flow preserving N = 1 supersymmetry 454
The Randall-Sundrum Geometry 456
An alternative to compactification 459
Bibliography 462
Exercises 463
String Theory and Matrix Models 470
M(atrix) Theory 471
Membrane quantization 471
Type-IIA D[subscript 0]-branes and DLCQ 473
Gravitons and branes in M(atrix) theory 476
The two-graviton interaction from M(atrix) theory 477
Matrix Models and D = 1 Bosonic String Theory 479
The continuum limit 481
Solving the matrix model 482
The double-scaling limit 485
The free-fermion picture 487
Matrix Description of D = 2 String Theory 488
Matrix quantum mechanics and free fermions on the line 490
The continuum limit 492
The double-scaling limit 494
D-particles, tachyons, and holography 496
Bibliography 498
Exercises 498
Two-dimensional Complex Geometry 503
Differential Forms 505
Theta and Other Elliptic Functions 507
[theta] and Related Functions 507
The Weierstrass Function 510
Modular Forms 510
Poisson Resummation 512
Toroidal Lattice Sums 513
Toroidal Kaluza-Klein Reduction 516
The Reissner-Nordstrom Black Hole 519
Electric-magnetic Duality in D = 4 522
Supersymmetric Actions in Ten and Eleven Dimensions 525
The N = 1[subscript 11] Supergravity 526
Type-IIA Supergravity 527
Type-IIB Supergravity 528
Type-II Supergravities: The Democratic Formulation 529
N = 1[subscript 10] Supersymmetry 530
N = 1,2, Four-dimensional Supergravity Coupled to Matter 533
N = 1[subscript 4] Supergravity 533
N = 2[subscript 4] Supergravity 535
BPS Multiplets in Four Dimensions 537
The Geometry of Anti-de Sitter Space 541
The Minkowski Signature AdS 541
Euclidean AdS 544
The Conformal Structure of Flat Space 546
Fields in AdS 548
The wave equation in Poincare coordinates 549
The bulk-boundary propagator 550
The bulk-to-bulk propagator 551
Bibliography 553
Index 575
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