Notes on the geography of the plane at infinity
arXiv:math/0610048
Abstract
The second relative homotopy group Ï_2(V(\C),V(\R)) (of the complex relative to the real points of an algebraic variety) encodes interesting information about the `bubbling' phenomena of quantum cohomology. We consider these groups in particular for genus zero Deligne-Mumford moduli spaces, as well as for certain generalizations introduced more recently by Manin and Losev.
An attempt to encode bubbling into the fundamental group(oid)