Rolling Tachyon Boundary State , Conserved Charges and Two Dimensional String Theory
Rolling Tachyon Boundary State , Conserved Charges and Two Dimensional String Theory
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滚动快子边界态,守恒电荷和二维弦理论
DOI：
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发表时间：
2004
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通讯作者：
Harish
中科院分区：
文献类型：
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作者：
Harish
与不稳定D膜上滚动的快子解相关的边界态包含在渐近的过去和渐近的未来中指数衰减的一部分，但它也包含在过去或未来保持不变或指数增长的其他部分。我们认为，后半部分的时间依赖性完全由边界态的BRST不变性的要求决定，因此它们包含了关于系统中某些守恒电荷的信息。我们还在二维弦理论中不稳定的D0膜的背景下研究了这一点，其中这些保留的电荷产生了与离散状态相关的闭合弦背景，并表明这些电荷与该理论的矩阵模型描述中的对称生成元一一对应。
The boundary state associated with the rolling tachyon solution on an unstable D-brane contains a part that decays exponentially in the asymptotic past and the asymptotic future, but it also contains other parts which either remain constant or grow exponentially in the past or future. We argue that the time dependence of the latter parts is completely determined by the requirement of BRST invariance of the boundary state, and hence they contain information about certain conserved charges in the system. We also examine this in the context of the unstable D0-brane in two dimensional string theory where these conseved charges produce closed string background associated with the discrete states, and show that these charges are in one to one correspondence with the symmetry generators in the matrix model description of this theory.