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Interactions of Strings Compactified on Orbifolds


Hamidi, Shahram (1987) Interactions of Strings Compactified on Orbifolds. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/gvyt-8e89.


It is very important to understand the process of string compactification before one can extract any reliable phenomenology. We consider an exactly solvable method of string compactification, in which the internal space is an orbifold. We compute various interaction amplitudes and describe how other amplitudes can be calculated.

Multi-valued string variables are handled by formulating the amplitudes on covering spaces where they become single-valued. In the computation of the amplitudes, stretched string intermediate states give rise to expressions that are non-perturbative from the non-linear sigma model point of view.

We also discuss, in the context of Z orbifold, the "blowing up" of the fixed points of an orbifold, to give rise to a Calabi-Yau manifold. The resulting Calabi-Yau manifold is shown to be non-perturbatively stable.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Frautschi, Steven C.
Thesis Committee:
  • Schwarz, John H. (chair)
  • Preskill, John P.
  • Fox, Geoffrey C.
  • Thorne, Kip S.
  • Frautschi, Steven C.
Defense Date:20 May 1987
Record Number:CaltechTHESIS:08012017-135315454
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10358
Deposited By: Benjamin Perez
Deposited On:01 Aug 2017 21:59
Last Modified:16 Apr 2021 23:24

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