Equivariant Chern numbers and the number of fixed points for unitary torus manifolds

Abstract

Let $M^{2n}$ be a unitary torus $(2n)$-manifold, i.e., a $(2n)$-dimensional oriented stable complex connected closed $T^n$-manifold having a nonempty fixed set. In this paper we show that $M$ bounds equivariantly if and only if the equivariant Chern numbers $<(c_1^{T^n}{)}^i(c_2^{T^n}{)}^j,[M]>=0$ for all $i,j\in \mathbb{N}$, where $c_l^{T^n}$ denotes the $l$th equivariant Chern class of $M$. As a consequence, we also show that if $M$ does not bound equivariantly then the number of fixed points is at least $\lceil \frac{n}{2}\rceil +1$.

arXiv comment7 pages

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