Abstract
We investigate the general solution with the symmetry ISO (1, p) × SO (9-p) of Type II supergravity (the three-parameter solution) from the viewpoint of the superstring theory. We find that one of the three parameters (c1) is closely related to the "dilaton charge" and the appearance of the dilaton charge is a consequence of deformations of the boundary condition from that of the boundary state for BPS D-branes. We give three examples of the deformed D-branes by considering the tachyon condensation from systems of [Formula: see text]-branes, unstable D9-branes and unstable D-instantons to the BPS saturated D p-branes, respectively. We argue that the deformed systems are generally regarded as tachyonic and/or massive excitations of the open strings on [Formula: see text]-brane systems.
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