非极小Laplace型算子的热渐近性及其在非交换环上的应用
Heat asymptotics for nonminimal Laplace type operators and application to noncommutative tori
摘要：
设$P$是作用在由$P= - [g^{μν} u(x)\partial_μ\partial_ν+ v^ν(x)\partial_ν+ w(x)]$局部给定的紧致黎曼流形上纤维$\mathbb{C}^N$的光滑厄米向量丛$V$上的Laplace型算子，其中$u,\,v^ν,\,w$是$M_N(\mathbb{C})$ -值函数，其$u(x)$为正可逆函数.对于任何$a \in Γ(\text{End}(V))$，我们考虑渐近性$\text{Tr} (a e^{-tP}) \underset{t \downarrow 0^+}{\sim} \,\sum_{r=0}^\infty a_r(a, P)\,t^{(r-d)/2}$，其中系数$a_r(a, P)$可以局部地写为$a_r(a, P)(x) = \text{tr}[a(x) \mathcal{R}_r(x)]$。$\mathcal{R}_2$的计算进行开放的机会来计算非交换环面的模标量曲率。
英文摘要：
Let $P$ be a Laplace type operator acting on a smooth hermitean vector bundle $V$ of fiber $\mathbb{C}^N$ over a compact Riemannian manifold given locally by $P= - [g^{μν} u(x)\partial_μ\partial_ν+ v^ν(x)\partial_ν+ w(x)]$ where $u,\,v^ν,\,w$ are $M_N(\mathbb{C})$-valued functions with $u(x)$ positive and invertible. For any $a \in Γ(\text{End}(V))$, we consider the asymptotics $\text{Tr} (a e^{-tP}) \underset{t \downarrow 0^+}{\sim} \,\sum_{r=0}^\infty a_r(a, P)\,t^{(r-d)/2}$ where the coefficients $a_r(a, P)$ can be written locally as $a_r(a, P)(x) = \text{tr}[a(x) \mathcal{R}_r(x)]$. The computation of $\mathcal{R}_2$ is performed opening the opportunity to calculate the modular scalar curvature for noncommutative tori.
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