Reply To: Questions regarding DPF.
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plutoG’day
You may find this link interesting, please excuse the non explanation by me.
http://arxiv.org/abs/1001.1415
Thin-shell wormholes from charged black holes in generalized dilaton-axion gravity
Authors: A. A. Usmani, F. Rahaman, Saibal Ray, Sk. A. Rakib, Z. Hasan, Peter K. F. Kuhfittig
(Submitted on 9 Jan 2010)
Abstract: This paper discusses a new type of thin-shell wormhole constructed by applying the cut-and-paste technique to two copies of a charged black hole in generalized dilaton-axion gravity, which was inspired by low-energy string theory. After analyzing various aspects of this thin-shell wormhole, we discuss its stability to linearized spherically symmetric perturbations.
You may need to go to wiki for terms.