The possible astrophysical role of superstrings is discussed. Type II superstrings (if somehow phenomenologically viable) might be seen as gravitational lenses. The superstrings of the new O(32) and E8×E8 string theories are boundaries of axion domain walls. These theories are also likely to generate more “conventional” string-like objects-stable vortex lines and flux tubes.
T. J.-L. Courvoisier, A. Blécha, P. Bouchet, P. Bratschi, M. T. Carini, Megan Donahue, Rick Edelson, Eric D. Feigelson, Alexei V Filippenko, I. S. Glass, J. Heidt, R. I. Kollgaard, T. Matheson, H. R. Miller, J. C. Noble, K. Sekiguchi, Paul S. Smith, C. M. Urry, S. J. Wagner
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