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arXiv math/0204163math.DG
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椭圆算子的eta和zeta函数的绝热极限

Adiabatic limits of eta and zeta functions of elliptic operators

Sergiu Moroianu

摘要:

我们扩展了绝热伪微分算子的微积分来研究微分算子$δ$的eta和zeta函数的绝热极限行为,该微分算子$δ$是由以$S^1$为索引的椭圆算子族构造的。我们证明了正则化值$η(δ_t,0)$和$tζ(δ_t,0)$是$t$在$t=0$的光滑函数,并且我们用行列式丛的完整性来识别它们在$t=0$的值,分别用剩余迹来识别它们。对于可逆算子族,函数$η(δ_t,s)$和$tζ(δ_t,s)$对于$s$的所有值都光滑地扩展到$t=0$.在用Gamma因子归一化后,zeta函数在绝热极限满足一个让人想起Riemann zeta函数的恒等式,而eta函数收敛于连通1-形式的Bismut-Freed亚纯族的体积。

英文摘要:

We extend the calculus of adiabatic pseudo-differential operators to study the adiabatic limit behavior of the eta and zeta functions of a differential operator $δ$, constructed from an elliptic family of operators indexed by $S^1$. We show that the regularized values $η(δ_t,0)$ and $tζ(δ_t,0)$ are smooth functions of $t$ at $t=0$, and we identify their values at $t=0$ with the holonomy of the determinant bundle, respectively with a residue trace. For invertible families of operators, the functions $η(δ_t,s)$ and $tζ(δ_t,s)$ are shown to extend smoothly to $t=0$ for all values of $s$. After normalizing with a Gamma factor, the zeta function satisfies in the adiabatic limit an identity reminiscent of the Riemann zeta function, while the eta function converges to the volume of the Bismut-Freed meromorphic family of connection 1-forms.

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