Closed String Tachyon Condensation at c=1
Closed String Tachyon Condensation at c=1
复制标题
c=1 时的闭弦快子凝聚
DOI：
10.1088/1126-6708/2004/05/062
复制
发表时间：
2004
影响因子：
5.4
通讯作者：
A. Strominger
中科院分区：
文献类型：
--
作者：
Joanna L. Karczmarek;A. Strominger
c = 1的矩阵模型，有或没有0型帽子，有一个精确的量子解对应于封闭弦快子凝聚沿着一个零表面。凝聚发生，时空溶解，在一个有限的延迟时间+。在这种依赖于时间的背景下，快子涨落的出射量子态的计算使用的集体场和精确的费米子图片。微扰粒子生产所引起的移动快子壁所示的是类似的软运动镜所引起的。因此，尽管快子的+是测地线不完全的，但在微扰理论中，入射态的量子关联是幺正地传递到出射态的。它还表明，非微扰，信息可以泄漏整个快子壁，和快子散射不是单一的。精确么正性只在自由费米子图中保持不变。
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 +. 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 + 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.