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A Worldsheet Derivation of the Classical Off-shell Boundary Action for the Dilaton in Half-Space
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abstract
We use the method of images to present a worldsheet derivation of the sphere partition function for the dilaton in half-space to leading order in $\alpha'$ with Neumann boundary conditions. We use Tseytlin's sphere prescription to obtain the total (bulk and boundary) off-shell classical bosonic string action for the dilaton in half-space and show that it satisfies the requirement for a well-defined variational principle
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