We construct a system of bosonic closed string field theory coupled to a<br />
D-brane. The interaction between the D-brane and closed string field is<br />
introduced using the boundary state which is a function of constant field<br />
strength $F_{\mu\nu}$ and the tilt $\theta_\mu^i$ of the D-brane. We find that<br />
the gauge invariance requirement on the system determines the<br />
$(F_{\mu\nu},\theta_\mu^i)$-dependence of the normalization factor of the<br />
boundary state as well as the form of the purely $(F_{\mu\nu},\theta_\mu^i)$<br />
term of the action. Correspondence between the action in the present formalism<br />
and the...