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String Theory Demystified

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INDEX 301<br />

Cyclic model, 277<br />

Cylinders, 37<br />

D<br />

D0-brane, 165, 176<br />

D1-brane, 165<br />

D3-brane, 165<br />

D-branes<br />

compactifi cation, 164–165<br />

multiple, 230–234<br />

overview, 221–222<br />

quantization, 225–230<br />

space-time arena, 223–224<br />

in string theory, 15–16<br />

in superstring theory, 230<br />

tachyons and decay, 235–237<br />

DD coordinates, 224–226<br />

De Sitter universe, 266<br />

Decay, D-brane, 235–237<br />

Diffeomorphism, 57–58<br />

Dilaton, 85, 188<br />

Dimensions<br />

compactifi cation, 153–155<br />

conformal, 111<br />

critical<br />

bosonic string theory, 82<br />

RNS superstrings, 149–150<br />

higher, 16–17<br />

spatial, 188<br />

Dirac delta function, 71<br />

Dirichlet boundary conditions<br />

equations of motion for string, 33<br />

open strings with fi xed endpoints, 47<br />

space-time arena, 223–224<br />

and T-duality, 164<br />

Distinct particles, 156<br />

Dp-branes, 221. See also D-branes<br />

Dualities<br />

overview, 15<br />

S-duality, 193<br />

T-duality<br />

for closed strings, 159–161<br />

D-branes, 164–165<br />

open strings and, 162–164<br />

overview, 192–193<br />

E<br />

E 8 × E 8 theory, 192<br />

Einstein fi eld equations, 266<br />

Einstein’s equation, 3<br />

Ekpyrotic temperature, 276<br />

Ekpyrotic universe, 275–278<br />

Electromagnetic interactions, 8<br />

Electron-positron pair, 7f<br />

Electrons, heavy, 17<br />

Electroweak theory, 232<br />

Endpoints, dual string, 164<br />

Energy-momentum tensor, 3, 52, 106, 136–139<br />

Entropy, 249–253, 257<br />

Equal-time anticommutation relations, 184<br />

Equations of motion<br />

closed strings, 46–47<br />

Euler characteristic, 36–39<br />

light-cone coordinates, 39–43<br />

open strings<br />

with fi xed endpoints, 47–48<br />

with free endpoints, 44–46<br />

overview, 21–22<br />

Poisson brackets, 49<br />

Polyakov action, 36<br />

relativistic point particle, 22–28<br />

for string, 32–35<br />

strings in space-time, 28–32<br />

wave equation solutions, 43–44<br />

Euclidean metrics, 93<br />

Euclidean quantum fi eld theories, 90<br />

Euler characteristic (χ), 36–39<br />

Euler-Lagrange equations, 39, 55<br />

Event horizon, 242<br />

Extremal black hole, 245<br />

F<br />

Families of particles, 17<br />

Fermion number operators, 148<br />

Fermionic coordinates, 168–169, 176, 184–185<br />

Fermionic fi elds, 116<br />

Fermions, 5, 8, 22, 127, 138. See also RNS superstrings;<br />

Supersymmetry<br />

Feynman diagram, 6–7<br />

Fiducial metric, 59<br />

Fine structure constant, 11<br />

First quantization, 69<br />

Five-dimensional black holes, 249<br />

Five-dimensional gravity, 257<br />

Fixed point boundary conditions<br />

equations of motion for string, 33<br />

open strings with fi xed endpoints, 47<br />

space-time arena, 223–224<br />

and T-duality, 164<br />

Flat metrics, 59–63<br />

Flatness problem, 267<br />

Fluctuations, brane, 276<br />

Fock space, 76, 197, 201<br />

Force-mediating particles, 127<br />

Fourier expansion, 49<br />

Free endpoint boundary conditions<br />

equations of motion for string, 33<br />

open strings with free endpoints, 44–45<br />

space-time arena, 223<br />

and T-duality, 164<br />

Free point particles, 22–28, 176<br />

Fundamental constants, 11–12<br />

Fundamental particles, 13f<br />

G<br />

Gamma matrices, 197–198<br />

Gauge freedom, 59<br />

General relativity (GR), 1–3, 240–243

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