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Title:Enumerative invariants for local Calabi-Yau threefolds
Author(s):Choi, Jinwon
Director of Research:Katz, Sheldon
Doctoral Committee Chair(s):Haboush, William J.
Doctoral Committee Member(s):Katz, Sheldon; Schenck, Henry K.; Nevins, Thomas A.
Department / Program:Mathematics
Discipline:Mathematics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Bogomol'nyi-Prasad-Sommerfeld (BPS) invariant
moduli space
equivariant sheaf
toric variety
wall crossing
Abstract:This thesis consists of three parts. In the first part, we compute the topological Euler characteristics of the moduli spaces of stable sheaves of dimension one on the total space of rank 2 bundle on P1 whose determinant is O(−2). We count the torus fixed stable sheaves of low degrees and show the results verify the predictions in physics and the local Gromov-Witten theory. In the second part, we compute the Poincar´e polynomial of the moduli space of stable sheaves with Hilbert polynomial 4n + 1 on P2. This is done by classifying all torus fixed points in the moduli space and computing the torus representation of their tangent spaces. The result is also in agreement with a computation in physics. In the third part, we propose an algorithm to compute the Euler characteristics of the moduli spaces of stable sheaves of dimension one on P2 by means of Joyce’s wall crossing formula. The wall crossing takes place over the moduli spaces of α-stable pairs as the stability parameter α varies. The results verify a conjecture in the theory of curve counting invariants motivated by physics.
Issue Date:2012-09-18
URI:http://hdl.handle.net/2142/34220
Rights Information:Copyright 2012 Jinwon Choi
Date Available in IDEALS:2012-09-18
Date Deposited:2012-08


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