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Closed strings from decaying D-branes
We compute the emission of closed string radiation from homogeneous rolling
tachyons. For an unstable decaying D-brane the radiated energy is infinite
to leading order for and finite for . 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 . 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.Comment: harvmac, 30 pages, 2 figures. v3: Improved discussion for non compact
brane
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