Closed strings from decaying D-branes

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We compute the emission of closed string radiation from homogeneous rolling tachyons. For an unstable decaying Dp-brane the radiated energy is infinite to leading order for p≤ 2 and finite for p>2. The closed string state produced by a decaying brane is closely related to the state produced by D-instantons at a critical Euclidean distance from t=0. In the case of a D0 brane one can cutoff this divergence so that we get a finite energy final state which would be the state that the brane decays into.