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本文较为详细地介绍了作者之一及其合作者近期在Type II弦理论中有关D膜间相互作用, 开弦对产生以及这种对产生在一定情况下的增强效应的系列研究工作. 具体包括计算了带有一般世界体常数电磁场情况下平行放置且有一定间距的两张D膜间的相互作用, 讨论了相关特性, 比如相互作用的吸引或排斥情况. 当其中至少一张膜带电场时, 这种相互作用振幅通常有一个虚部, 反映了该系统的一种不稳定性即开弦对的产生, 并给出相应的衰变率和开弦对产生率. 另外, 探讨了这种开弦对产生率的增强效应, 发现其与所加的电场和磁场的方向和大小相关联. 当其中一个膜的空间维度为3, 另一个膜的空间维度为1时, 这种开弦对产生率可以大到人类实验室条件下得以检验. 开弦对的产生率与两膜沿额外维方向的间距密切关联, 如果假定弦理论的正确性及人类的4维时空可以看成一张D3膜的话, 测量开弦对产生所给出的(比如)电流并验证其与所加电磁场的关系符合预言, 由此可以检验额外维的存在性. 同时, 这也为弦理论提供了一种实验检验, 并且这是一种无须将该理论紧化到四维时空的全新方式.This review article reports the recent studies, based on a series of publications by one of the present authors along with his collaborators, regarding the interaction between two D-branes, the open string pair production and its possible enhancement in Type II superstring theories. Specifically, computed is the interaction amplitude between two D-branes, placed parallel at a separation, with each carrying a general worldvolume constant flux, and discussed are the amplitude properties, say, the repulsive or attractive nature of the interaction. When at least one of the D-branes carries an electric flux, the interaction amplitude can have an imaginary part, reflecting the instability of the underlying system via the open string pair production. The decay rate and the pair production rate are both computed. In addition, the enhancement of the latter is found when the added electric and magnetic fluxes are correlated in both magnitude and direction in a certain manner. In particular, when one of the branes is D3 and the other is D1, the corresponding pair production rate becomes large enough to be tested in an earthbound laboratory. Note that the pair production rate is related to the brane separation along the direction transverse to both branes, therefore, to the extra-dimensions with respect to the brane observer. So if the underlying string theory is relevant and the D3 can be taken as our own 4-dimensional world, measuring, say, the electric current due to the pair production and comparing it against the added electric and magnetic fields to see if the measurements agree with the prediction of the computations. This can be used to verify the existence of extra-dimensions. Further, this provides also a potential new means to test the underlying string theory without the need of compactifying it to four dimensions.
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Keywords:
- D-branes /
- strings and branes
[1] Dai J, Leigh R G, Polchinski J 1989 Mod. Phys. Lett. A 4 2073
Google Scholar
[2] Duff M J, Lu J X 1991 Phys. Lett. B 273 409
Google Scholar
[3] Duff M J, Lu J X 1994 Nucl. Phys. B 416 301
Google Scholar
[4] Duff M J, Khuri R R, Lu J X 1995 Phys. Rep. 259 213
Google Scholar
[5] Polchinski J 1995 Phys. Rev. Lett. 75 4724
Google Scholar
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Google Scholar
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Google Scholar
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图 3 闭弦树图相互作用与开弦单圈相互作用的等价性
Fig. 3. The equivalence of a closed string tree-level cylinder amplitude and an open string one-loop annulus amplitude
图 4 一根虚开弦转一个闭合时间圈等价于虚正反开弦对的产生和湮灭
Fig. 4. A virtual open string circulating a closed time loop can be viewed as a pair of virtual open stringand virtual anti open string creating and annihilating.
表 1 对于
$p \leqslant 6$ , 决定相应本征值所需要的方程Table 1. The equations needed to determine the corresponding eigenvalues for
$ p \leqslant 6$ .p 本征值满足的关系 0 $\lambda = 1$ 1 $\lambda_{0} + \lambda^{-1}_{0} = {\rm{tr} } { {w}}$ 2 $\lambda_{0} + \lambda^{-1}_{0} = {\rm{tr} } { {w}} - 1$, $\lambda = 1$ 3 $\displaystyle\sum_{\alpha =0}^{1} (\lambda_{\alpha} + \lambda^{-1}_{\alpha}) = {\rm{tr} } { {w}}, \;\;\displaystyle\sum_{\alpha =0}^{1} (\lambda^{2}_{\alpha} + \lambda^{-2}_{\alpha}) = {\rm{tr} } { {w}}^{2}$ 4 $\displaystyle\sum_{\alpha =0}^{1} (\lambda_{\alpha} + \lambda^{-1}_{\alpha}) = {\rm{tr} } { {w}} - 1, \;\;\displaystyle\sum_{\alpha =0}^{1} (\lambda^{2}_{\alpha} + \lambda^{-2}_{\alpha}) = {\rm{tr} } { {w}}^{2} - 1, \, \lambda = 1$ 5 $\displaystyle\sum_{\alpha =0}^{2} (\lambda_{\alpha} + \lambda^{-1}_{\alpha}) = {\rm{tr} } { {w}}, \;\;\displaystyle\sum_{\alpha =0}^{2} (\lambda^{2}_{\alpha} + \lambda^{-2}_{\alpha}) = {\rm{tr} } { {w}}^{2}, \;\;\displaystyle\sum_{\alpha =0}^{2} (\lambda^{3}_{\alpha} + \lambda^{-3}_{\alpha}) = {\rm{tr} } { {w}}^{3}$ 6 $\displaystyle\sum_{\alpha =0}^{2} (\lambda_{\alpha} + \lambda^{-1}_{\alpha}) = {\rm{tr} } { {w}} - 1, \;\;\displaystyle\sum_{\alpha =0}^{2} (\lambda^{2}_{\alpha} + \lambda^{-2}_{\alpha}) = {\rm{tr} } { {w}}^{2} - 1, $ $\displaystyle\sum_{\alpha =0}^{2} (\lambda^{3}_{\alpha} + \lambda^{-3}_{\alpha}) = {\rm{tr} } { {w}}^{3} - 1,$ $ \lambda = 1$ 
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表 2 振幅表达式((44)式)方括号中
$\theta$ 项及其简化Table 2. The
$\theta$ -terms in the square bracket in Eq. (44) and their simplification.p 振幅表达式((44)式)方括号中$\theta$项及其简化 0 $\theta^{4}_{3} (0 |it) - \theta^{4}_{4} (0 |it) - \theta^{4}_{2} (0 | it) = 2\, \theta^{4}_{1} (0 | it) = 0$ 1 或 2 $\theta^{3}_{3} (0 |it) \theta_{3} (\nu_{0} |it) - \theta^{3}_{4} (0 |it) \theta_{4} (\nu_{0} |it) - \theta^{3}_{2} (0 |it) \theta_{2} (\nu_{0} | it) = 2\, \theta^{4}_{1} \left(\left.\dfrac{\nu_{0}}{2}\right| it \right)$ 3 或 4 $\theta^{2}_{3} (0 |it) \theta_{3} (\nu_{0} |it) \theta_{3} (\nu_{1} |it)- \theta^{2}_{4} (0 |it) \theta_{4} (\nu_{0} |it) \theta_{4} (\nu_{1} |it)- \theta^{2}_{2} (0 |it) \theta_{2} (\nu_{0} | it)\theta_{2} (\nu_{1} | it)$$= 2\, \theta^{2}_{1} \left(\left.\dfrac{\nu_{0} + \nu_{1} }{2}\right|it \right) \theta^{2}_{1} \left(\left.\dfrac{\nu_{0} - \nu_{1} }{2}\right|it \right)$ 5 或 6 $\theta_{3} (0 |it) \theta_{3} (\nu_{0} |it) \theta_{3} (\nu_{1} |it) \theta_{3} (\nu_{2} |it) - \theta_{4} (0 |it) \theta_{4} (\nu_{0} |it) \theta_{4} (\nu_{1} |it) \theta_{4} (\nu_{2} |it)$$ - \theta_{2} (0 |it) \theta_{2} (\nu_{0} | it)\theta_{2} (\nu_{1} | it) \theta_{2} (\nu_{2} | it) $ $= 2\, \theta_{1} \left(\left.\dfrac{\nu_{0} + \nu_{1} + \nu_{2} }{2}\right| it \right) \theta_{1} \left(\left.\dfrac{\nu_{0} - \nu_{1} + \nu_{2} }{2}\right| it \right) \theta_{1} \left(\left.\dfrac{\nu_{0} + \nu_{1} - \nu_{2} }{2}\right| it \right)\theta_{1} \left(\left.\dfrac{\nu_{0} - \nu_{1} - \nu_{2} }{2}\right| it \right) $
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[1] Dai J, Leigh R G, Polchinski J 1989 Mod. Phys. Lett. A 4 2073
Google Scholar
[2] Duff M J, Lu J X 1991 Phys. Lett. B 273 409
Google Scholar
[3] Duff M J, Lu J X 1994 Nucl. Phys. B 416 301
Google Scholar
[4] Duff M J, Khuri R R, Lu J X 1995 Phys. Rep. 259 213
Google Scholar
[5] Polchinski J 1995 Phys. Rev. Lett. 75 4724
Google Scholar
[6] Lu J X, Ning B, Roy S, Xu S S 2007 JHEP 0708 042
[7] Lu J X, Ning B, Wei R, Xu S S 2009 Phys. Rev. D 79 126002
Google Scholar
[8] Lu J X, Xu S S 2009 JHEP 0909 093
[9] Lu J X, Xu S S 2009 Phys. Lett. B 680 387
Google Scholar
[10] Lu J X 2017 JHEP 1712 076
[11] Lu J X 2018 Nucl. Phys. B 934 39
Google Scholar
[12] Jia Q, Lu J X 2019 Phys. Lett. B 789 568
Google Scholar
[13] Lu J X 2019 Phys. Lett. B 788 480
Google Scholar
[14] Jia Q, Lu J X, Wu Z, Zhu X 2020 Nucl.Phys. B 953 114947
Google Scholar
[15] Lu J X 2019 JHEP 1910 238
[16] Vecchia P Di, Liccardo A 2000 NATO Adv. Study Inst. Ser. C. Math. Phys. Sci. 556 1
[17] Vecchia P Di, Liccardo A 1999 arXiv: hep-th/9912275 [hep-th]
[18] Schwinger J S 1951 Phys. Rev. 82 664
Google Scholar
[19] Bachas C, Porrati M 1992 Phys. Lett. B 296 77
Google Scholar
[20] Porrati M 1993 arXiv: hep-th/9309114 [hep-th]
[21] Billo M, Vecchia P Di, Frau M, Lerda A, Pesando I, Russo R, Sciuto S 1998 Nucl. Phys. B 526 199
Google Scholar
[22] Vecchia P Di, Frau M, Lerda A, Liccardo A 2000 Nucl. Phys. B 565 397
Google Scholar
[23] Callan C G, Lovelace C, Nappi C R, Yost S A 1987 Nucl. Phys. B 288 525
Google Scholar
[24] Callan C G, Lovelace C, Nappi C R, Yost S A 1987 Nucl. Phys. B 293 83
Google Scholar
[25] Callan C G, Lovelace C, Nappi C R, Yost S A 1988 Nucl. Phys. B 308 221
Google Scholar
[26] Yost S A 1989 Nucl. Phys. B 321 629
Google Scholar
[27] Polchinski J 1998 String Theory (Vol. 1) (Cambridge: Cambridge University Press) pp214–216
[28] Whittaker E T, Watson G N 1963 A Course of Modern Analysis (4th Ed. reprinted) (Cambridge: Cambridge University Press) pp467–468
[29] Hahn S, Kim Kwanglok, Kim Kwangmin, et al. 2019 Nature 570 496
Google Scholar
[30] Berenstein D 2014 Ann. Rev. Nucl. Part. Sci. 64 197
Google Scholar
[31] Nikishov A I 1970 Sov. Phys. JETP 30 660
[32] Nikishov A I 1970 Nucl. Phys. B 21 346
Google Scholar
[33] Kruglov S I 2001 Eur. Phys. J. C 22 89
[34] Ferrara S, Porrati M 1993 Mod. Phys. Lett. A 8 2497
Google Scholar
[35] Bolognesi S, Kiefer F, Rabinovici E 2013 JHEP 1301 174
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