Closed String Tachyon Condensation at c=1

Abstract

The c=1 matrix model, with or without a type 0 hat, has an exact quantum solution corresponding to closed string tachyon condensation along a null surface. The condensation occurs, and spacetime dissolves, at a finite retarded time on I^+. The outgoing quantum state of tachyon fluctuations in this time-dependent background is computed using both the collective field and exact fermion pictures. Perturbative particle production induced by the moving tachyon wall is shown to be similar to that induced by a soft moving mirror. Hence, despite the fact that I^+ for the tachyon is geodesicaly incomplete, quantum correlations in the incoming state are unitarily transmitted to the outgoing state in perturbation theory. It is also shown that, non-perturbatively, information can leak across the tachyon wall, and tachyon scattering is not unitary. Exact unitarity remains intact only in the free fermion picture.

Minor corrections; References added; 24 pages, 2 figures, harvmac

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• Matrix Cosmology
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• Matrix Quantum Mechanics and Two-dimensional String Theory in Non-trivial Backgrounds
• Decay of C/Z_n: exact supergravity solutions
• On decay of Bulk Tachyons
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