Ben Rathaus, Assaf Ben-David, Nissan Itzhaki
We extend our study of a universe with a non-classical stringy topology, and consider an orbifold line topology, R x R^2 / Z_p. This topology has a fixed line and identifies each point in space with p-1 other points. An observable imprint of an orbifold line on the CMB is the appearance of up to (p-1)/2 pairs of matching circles. Searching the WMAP data for matching circles, we can rule out an orbifold line topology with p up to 10, except for p=8. The significance of the peak at p=8, varies between data releases of WMAP, and therefore this peak remains to be explored further with future data.
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http://arxiv.org/abs/1302.7161
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