308
14 Amplitude Factorization and Feynman Diagrams
moduli space). A simple way to prevent overlaps is to tune the stub parameter s 0 to
a large value.
By construction, the integral over V g,n should be finite. If this is not the case, it
means that the propagator graphs also diverge and that the parametrization is not
good. This can also be solved by considering a sufficiently large value of the stub
parameter s 0 .
14.4 Suggested Readings
• Plumbing fixture and amplitude factorization [1, sec. 9.3, 9.4, 2, sec. 6].
References
1. J. Polchinski, String Theory: Volume 1, An Introduction to the Bosonic String (Cambridge
University Press, Cambridge, 2005)
2. E. Witten, Superstring perturbation theory revisited (2012). arXiv:1209. 5461
3. B. Zwiebach, Closed string field theory: quantum action and the BV master equation. Nucl.
Phys. B 390(1), 33–152 (1993). https://doi.org/10.1016/0550-3213(93)90388-6. arXiv: hepth/9206084
4. B. Zwiebach, Building string field theory around non-conformal backgrounds. Nucl. Phys.
B 480(3), 541–572 (1996). https://doi.org/10.1016/S0550-3213(96)00502-0. arXiv: hepth/9606153
14 Amplitude Factorization and Feynman Diagrams
moduli space). A simple way to prevent overlaps is to tune the stub parameter s 0 to
a large value.
By construction, the integral over V g,n should be finite. If this is not the case, it
means that the propagator graphs also diverge and that the parametrization is not
good. This can also be solved by considering a sufficiently large value of the stub
parameter s 0 .
14.4 Suggested Readings
• Plumbing fixture and amplitude factorization [1, sec. 9.3, 9.4, 2, sec. 6].
References
1. J. Polchinski, String Theory: Volume 1, An Introduction to the Bosonic String (Cambridge
University Press, Cambridge, 2005)
2. E. Witten, Superstring perturbation theory revisited (2012). arXiv:1209. 5461
3. B. Zwiebach, Closed string field theory: quantum action and the BV master equation. Nucl.
Phys. B 390(1), 33–152 (1993). https://doi.org/10.1016/0550-3213(93)90388-6. arXiv: hepth/9206084
4. B. Zwiebach, Building string field theory around non-conformal backgrounds. Nucl. Phys.
B 480(3), 541–572 (1996). https://doi.org/10.1016/S0550-3213(96)00502-0. arXiv: hepth/9606153