Algebraic Geometry: Seattle 2005, Summer Research Institute by D. Abramovich, A. Bertram, L. Katzarkov, R. Pandharipande, PDF

By D. Abramovich, A. Bertram, L. Katzarkov, R. Pandharipande, M. Thaddeus (ed.)

ISBN-10: 0821847023

ISBN-13: 9780821847022

ISBN-10: 0821847031

ISBN-13: 9780821847039

The 2005 AMS summer time Institute on Algebraic Geometry in Seattle used to be a massive occasion. With over 500 members, together with the various world's prime specialists, it was once possibly the most important convention on algebraic geometry ever held. those court cases volumes current learn and expository papers by way of the most impressive audio system on the assembly, vividly conveying the grandeur and energy of the topic. the main interesting themes in present algebraic geometry learn obtain very plentiful remedy. for example, there's enlightening info on a number of the newest technical instruments, from jet schemes and derived different types to algebraic stacks. a variety of papers delve into the geometry of varied moduli areas, together with these of solid curves, good maps, coherent sheaves, and abelian forms. different papers talk about the new dramatic advances in higher-dimensional bi rational geometry, whereas nonetheless others hint the impression of quantum box thought on algebraic geometry through replicate symmetry, Gromov - Witten invariants, and symplectic geometry. The court cases of previous algebraic geometry AMS Institutes, held at Woods gap, Arcata, Bowdoin, and Santa Cruz, became classics. the current volumes promise to be both influential. They current the state-of-the-art in algebraic geometry in papers that would have large curiosity and enduring worth

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Extra resources for Algebraic Geometry: Seattle 2005, Summer Research Institute July 25-August 12, 2005, University of Washington, Seattle, Washington part 2

Example text

The change of variables for the crepant resolution conjecture in the case of G-Hilb(V ) → V /G where G is a polyhedral or binary polyhedral group is given by y0 = x0 , 1 yR = |G| qR = exp χV (g) − dim V χR (g) x(g) , g∈G 2πi dim R |G| where R runs over the non-trivial irreducible representations of G. The term under the radical is always a negative real number and so the square root can chosen to be a positive multiple of i. Note that as a consequence of V being the natural representation of a polyhedral or binary polyhedral group, the orbifold X = [V /G] satisfies the hard Lefschetz condition.

However, in this case, we know that the degree of cνµ is zero, so the divisibility constraint forces this invariant to vanish. This reduces our task to the calculation of the invariants cµµ . We can further reduce to the case where the partition µ has just one part, by using the following lemma. 9. cµµ 1 = z(µ) l(µ) (µ ) µi c(µii ) . i=1 The right hand side of this formula is easily seen to be the contribution from those components of M 0,((2),µ,µ) (X , d) where the corresponding branched cover C consists of l(µ) connected components, all but one of which is a smooth genus zero curve branched only at 0 and ∞.

Combining the above formulas with the divisor equation and the point axiom, we have shown the following. 2. The genus zero Gromov-Witten potential function of Y is given by: 1 d dy1 1 1 t 1 + t2 3 FY = y1 + (t1 + t2 ) y 3 − y0 y12 + q e . 12t1 t2 0 4 12 d3 d>0 We now consider the invariants for the orbifold X . Let 1 and D be the nat0 2 ural generators for Horb (X ) and Horb (X ) and let x0 and x1 be the corresponding variables. Since the coarse moduli space for X is affine, every stable map is constant.

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Algebraic Geometry: Seattle 2005, Summer Research Institute July 25-August 12, 2005, University of Washington, Seattle, Washington part 2 by D. Abramovich, A. Bertram, L. Katzarkov, R. Pandharipande, M. Thaddeus (ed.)


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