arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1106.3307hep-th
收藏

圆盘振幅、图像变化与时空作用

Disc amplitudes, picture changing and space-time actions

Katrin Becker, Guangyu Guo, Daniel Robbins

摘要:

我们详细研究了通过计算弦论圆盘振幅来获得D-膜与闭弦场耦合的过程。我们进行了仔细的建设相关的顶点运营商和讨论的影响,插入的边界状态编码的D-膜的存在。我们面临的问题,非去耦的BRST精确状态,并证明了这个问题是逃避我们需要的计算,从而表明,我们的振幅自动规范不变的和独立的图像电荷的分布。最后,我们显式地计算了圆盘上两个NS-NS场或一个NS-NS场和一个R-R场的两点振幅,并将所有的最低阶项与超引力的预言进行了仔细的比较。

英文摘要:

We study in detail the procedure for obtaining couplings of D-branes to closed string fields by evaluating string theory disc amplitudes. We perform a careful construction of the relevant vertex operators and discuss the effects of inserting the boundary state which encodes the presence of the D-brane. We confront the issue of non-decoupling of BRST-exact states and prove that the problem is evaded for the computations we need, thus demonstrating that our amplitudes are automatically gauge-invariant and independent of the distribution of picture charge. Finally, we compute explicitly the two-point amplitudes of two NS-NS fields or one NS-NS and one R-R field on the disc, and we carefully compare all the lowest order terms with predictions from supergravity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑