Massless Boundary Sine-Gordon Model Coupled to External Fields

Details Massless Boundary Sine-Gordon Model Coupled to External Fields Massless Boundary Sine-Gordon Model Coupled to External Fields

2004-10-19

arxiv.org/abs/hep-th/0410197v1

JHEP0501:048,2005

Physics

High Energy Physics

High Energy Physics - Theory

11pages, LaTeX

Scientific paper

10.1088/1126-6708/2005/01/048

We investigate a generalization of the massless boundary sine-Gordon model with conformal invariance, which has been used to describe an array of D-branes (or rolling tachyon). We consider a similar action whose couplings are replaced with external fields depending on the boundary coordinate. Even in the presence of the external fields, this model is still solvable, though it does not maintain the whole conformal symmetry. We obtain, to all orders in perturbation theory in terms of the external fields, a simpler expression of the boundary state and the disc partition function. As a by-product, we fix the relation between the bare couplings and the renormalized couplings which has been appeared in papers on tachyon lump and rolling tachyon.

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