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We study inflation arising from the motion of a BPS D3-brane in thebackground of a stack of k parallel D5-branes. There are two scalar fields inthis set up-- (i) the radion field R, a real scalar field, and (ii) a complextachyonic scalar field chi living on the world volume of the open stringstretched between the D3 and D5 branes. We find that inflation is realized bythe potential of the radion field, which satisfies observational constraintscoming from the Cosmic Microwave Background. After the radion becomes of orderthe string length scale l_s, the dynamics is governed by the potential of thecomplex scalar field. Since this field has a standard kinematic term, reheatingcan be successfully realized by the mechanism of tachyonic preheating withspontaneous symmetry breaking.Comment: 10 pages, 4 figures. Minor clarifications and references added.  Version to appear in Phys. Rev.

Inflation from D3-brane motion in the background of D5-branes