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## Main Question or Discussion Point

Hi all,

I've been reading on phase changes that occur in manifolds such as flop transitions and conifold transitions for some time but I don't quite understand this one thing: flop transitions mathematically describe how one calabi-yau can change into another and most books mention that but what really causes this change? The book I am reading elegantly describes what happens to a calabi-yau manifold as it goes through but it doesn't say what causes it? I would love to know the name/description of the process that causes these phase changes, also any links to papers and such would be greatly appreciated. Thanks a lot :)

- Vikram

I've been reading on phase changes that occur in manifolds such as flop transitions and conifold transitions for some time but I don't quite understand this one thing: flop transitions mathematically describe how one calabi-yau can change into another and most books mention that but what really causes this change? The book I am reading elegantly describes what happens to a calabi-yau manifold as it goes through but it doesn't say what causes it? I would love to know the name/description of the process that causes these phase changes, also any links to papers and such would be greatly appreciated. Thanks a lot :)

- Vikram