flop transition

The *flop transition* is a continuous path in a space of *noncommutative 2-geometries* that starts at an ordinary complex 3-dimensional Calabi-Yau space, then passes through a point that does not correspond to an ordinary geometry (the *Gepner point*) and emerges afterwards again as an ordinary CY-geometry – but now with different topology.

This was found and discussed in the context of string theory but the phenomenon is a general abstract one in the theory of 2d SCFTs regarded as generalized geometries – as described at 2-spectral triple.

A survey is in

- Brian Greene,
*String Theory on Calabi-Yau Manifolds*(arXiv:hep-th/9702155)

A rough and brief survey of the flop transition and related phenomena with many pointers to original literature is also given in

- Brian Greene,
*Aspects of collapsing cocycles*(ps)

Revised on March 20, 2014 03:05:52
by Urs Schreiber
(89.204.138.150)