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We discuss novel properties of the string field and the Open String FieldTheory action arising in a system with multiple D-branes, then use the leveltruncation scheme to study marginal deformations and tachyon condensation in asystem with two parallel but separated branes. We find string fieldscorresponding to D-brane decay combined with a finite change in the distancebetween the two D-branes. Using D-brane separation as a yardstick, we are ableto continuously control the spacetime displacement of the D-branes and findthat our solutions exist only for a finite range of this displacement. Thus, atleast in level truncation, Open String Field Theory seems unable to describethe entire CFT moduli space.

SFT on separated D-branes and D-brane translation