YuWei Fan / 范祐維
Department of Mathematics
Harvard University
One Oxford Street, Cambridge, MA 02138
Email:
Office: Science Center 425c
I am a fourth (becoming fifth) year graduate student at Harvard, working with
ShingTung Yau.
We have a
student seminar
in which we talk about lots of different topics.
I have pretty broad interests in algebraic geometry, symplectic geometry, dynamics and mathematical physics.
These days I am working on projects surrounding
mirror symmetry,
which is a conjectural duality between algebraic geometry and symplectic geometry.
More specifically, I am thinking about its interplays with Bridgeland stability conditions,
wallcrossings, autoequivalences and Teichmüller theory.
Curriculum Vitae
Papers
My papers are all available on the
arXiv.

 
Systoles, Special Lagrangians, and Bridgeland stability conditions.
[
Abstract,
PDF,
Notes
]
Loewner's torus systolic inequality says that the systole (least length of a noncontractible loop) on a twotorus
can't be too large compare to its volume.
We propose to generalize the systolic inequality from the viewpoint of CalabiYau geometry.
This naturally leads to the notions of categorical systole and systolic ratio of a Bridgeland stability condition.
Then we study the systolic problem in the case of a K3 surface.

2018 
 
On entropy of Ptwists.
[
Abstract,
PDF
]
Ptwists are the mirror of Dehn twists along Lagrangian complex projective space under mirror symmetry.
We compute the categorical entropy of autoequivalences given by Ptwists,
and show that these autoequivalences satisfy a GromovYomdin type conjecture.


 
WeilPetersson geometry on the space of Bridgeland stability conditions
(with A. Kanazawa and S.T. Yau).
[
Abstract,
PDF,
Notes
]
We define a WeilPetersson potential function on the space of Bridgeland stability conditions,
with the hope of further understand the stringy Kähler moduli space of CalabiYau manifolds.
We show that the induced WeilPetersson metric coincides with the Bergman metric in some twodimensional cases.


 
Mirror of Atiyah flop in symplectic geometry and stability conditions
(with H. Hong, S.C. Lau and S.T. Yau).
[
Abstract,
PDF
]
We study the mirror operation of the Atiyah flop in symplectic geometry.
We formulate the operation for a symplectic manifold with a Lagrangian fibration.
Furthermore we construct geometric stability conditions on the derived Fukaya category of the deformed conifold
and study the action of the mirror Atiyah flop on these stability conditions.

2017 
 
Entropy of an autoequivalence on CalabiYau manifolds.
To appear in Mathematical Research Letters.
[
Abstract,
PDF,
Notes,
Slides
]
We construct the first counterexamples of a conjecture on categorical entropy.
While the construction is purely algebrogeometric,
the reason to expect counterexamples actually comes from the symplectic side of mirror symmetry.
