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20022009
most citedEnergy Gaps in Graphene Nanoribbons

5.1k citations

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10 papers · 1 filter

math.DG2007

A global view of equivariant vector bundles and Dirac operators on some compact homogeneous spaces

Marc A. Rieffel

In order to facilitate the comparison of Riemannian homogeneous spaces of compact Lie groups with noncommutative geometries ("quantizations") that approximate them, we develop here…

math.DG2006

Elliptic Genera, Transgression and Loop Space Chern-Simons Forms

Qingtao Chen, Fei Han

We compute the Chern-Simons transgressed forms of some modularly invariant characteristic forms, which are related to the elliptic genera. We study the modularity properties of the…

math.DG2005

The Boundary between Compact and Noncompact Complete Riemann Manifolds

D. Holcman, C. Pugh

In 1941 Sumner Myers proved that if the Ricci curvature of a complete Riemann manifold has a positive infimum then the manifold is compact and its diameter is bounded in terms of t…

math.DG20041 cited

The equivariant cohomology of hypertoric varieties and their real loci

Megumi Harada, Tara S. Holm

Let M be a Hamiltonian T space with a proper moment map, bounded below in some component. In this setting, we give a combinatorial description of the T-equivariant cohomology of M,…

math.DG2004

Contact reduction and groupoid actions

Marco Zambon, Chenchang Zhu

We introduce a new method to perform reduction of contact manifolds that extends Willett's (math.SG/0104080) and Albert's results. To carry out our reduction procedure all we need…

math.DG20044 cited

Integrating Lie algebroids via stacks

Hsian-Hua Tseng, Chenchang Zhu

Lie algebroids can not always be integrated into Lie groupoids. We introduce a new object--``Weinstein groupoid'', which is a differentiable stack with groupoid-like axioms. With i…