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String Theory Demystified

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Quiz Solutions 287<br />

3. i( − )<br />

4. 1<br />

4<br />

1 1<br />

µν 2 µν 2<br />

µ ν η η <br />

s s<br />

0 x x 0 + ln z − ln( z − z′<br />

)<br />

4 2<br />

5. ηµν 2<br />

s 1<br />

2 ( z − z′<br />

)<br />

µ ν<br />

6. 0 x x 0<br />

µν<br />

µ ν η<br />

7. 0 x x 0 − (ln z+ ln z)<br />

2πT<br />

2<br />

− − ′ ⎛ ⎞<br />

⎝<br />

⎜<br />

⎠<br />

⎟ + − ′ ⎛ ⎞<br />

⎝<br />

⎜<br />

⎠<br />

⎟ + − ′ ⎛<br />

η<br />

µν<br />

z z z<br />

ln 1 ln 1 ln 1<br />

4πT<br />

z z ⎝ z<br />

⎜<br />

⎞<br />

⎠<br />

⎟ + + ′ ⎛<br />

⎧<br />

⎞ ⎫<br />

⎨<br />

ln<br />

⎝<br />

⎜1<br />

⎠<br />

⎟ ⎬<br />

⎩<br />

⎭<br />

z<br />

z<br />

µν<br />

η<br />

8. − ln( z− z′ )( z− z′ ) + ln( z − z′ )( z − z′<br />

)<br />

4πT { }<br />

⎛ k<br />

⎞<br />

s ik⋅ X( w)<br />

ik⋅ X( w)<br />

9. −<br />

+ ∂<br />

s<br />

⎝<br />

⎜<br />

w<br />

z−w − e<br />

z w e<br />

2 2<br />

2<br />

1<br />

2<br />

2(<br />

) ⎠ ⎟<br />

Chapter 6<br />

1. 0<br />

3 2 ⎛ 2⎞<br />

3<br />

2. ∂ ∂ + −<br />

2 ⎝<br />

⎜<br />

12 3⎠<br />

⎟ ∂<br />

⎛ D ⎞<br />

∫<br />

⎝<br />

⎜ cc<br />

cc<br />

⎠<br />

⎟<br />

3. 26<br />

4. k 2<br />

1<br />

=<br />

α ′<br />

Chapter 7<br />

1. You will need the supplementary boundary condition<br />

2π<br />

∞<br />

dσ dτ[<br />

∂ + ( ψ−δψ−) +∂−<br />

( ψ+ δψ+<br />

) ]= 0<br />

∫0∫−∞ 2. i T µ ν<br />

ψ ραψ .<br />

2

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