Can someone help me understand exactly what a0 is in the following paper (page9)?(adsbygoogle = window.adsbygoogle || []).push({});

http://arxiv.org/pdf/1405.1283v1.pdf

"where a0 ≡ be−∆/2 (60) is a fixed length that can only be determined by experiment."

Found it in this article which has a better diagram:

http://www.kicc.cam.ac.uk/news/wormholes-negative-energy [Broken]

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# Wormhole paper

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