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arXiv 2102.12958math.SPmath-phmath.MP
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小边量子图上椭圆算子的预解式的解析性

Analyticity of resolvents of elliptic operators on quantum graphs with small edges

D. I. Borisov

摘要:

我们考虑一个任意的度量图,我们粘另一个图的长度成正比的$\varepsilon$,其中$\varepsilon$是一个小的正参数的边。在这样的图上,考虑了一般的二阶自伴变系数微分算子$\mathcal{H}_\varepsilon$,并假设$\varepsilon$中的微分表达式和顶点条件中的所有系数都是解析的.我们引入一个特殊的算子,通过重新标度上述的小边得到的特定的图,并假设它没有嵌入的特征值在其本质谱的阈值。在这样的假设下,我们证明了$\mathcal{H}_\varepsilon$的预解式的某些部分在$\varepsilon$中是解析的。这使我们能够表示的预解$\mathcal{H}_\varepsilon$由一个一致收敛的泰勒级数和它的部分和可用于近似的预解到任意幂的$\varepsilon$。特别地,零级近似再现了G. Berkolaiko,Yu. Latushkin,S.苏赫塔耶夫和C. Cacciapuoti,但我们还表明,下一个首项,在$\varepsilon$ -展开的微分表达式和顶点条件的系数可以有助于限制运营商生产的罗宾部分的顶点,小边是事件。我们还讨论了可能的推广我们的模型,包括一个更一般的几何图形的小部分和非解析$\varepsilon$依赖的微分表达式和顶点条件的系数的情况下。

英文摘要:

We consider an arbitrary metric graph, to which we glue another graph with edges of lengths proportional to $\varepsilon$, where $\varepsilon$ is a small positive parameter. On such graph, we consider a general self-adjoint second order differential operator $\mathcal{H}_\varepsilon$ with varying coefficients subject to general vertex conditions; all coefficients in differential expression and vertex conditions are supposed to be analytic in $\varepsilon$. We introduce a special operator on a certain graph obtained by rescaling the aforementioned small edges and assume that it has no embedded eigenvalues at the threshold of its essential spectrum. Under such assumption, we show that certain parts of the resolvent of $\mathcal{H}_\varepsilon$ are analytic in $\varepsilon$. This allows us to represent the resolvent of $\mathcal{H}_\varepsilon$ by an uniformly converging Taylor-like series and its partial sums can be used for approximating the resolvent up to an arbitrary power of $\varepsilon$. In particular, the zero-order approximation reproduces recent convergence results by G. Berkolaiko, Yu. Latushkin, S. Sukhtaiev and by C. Cacciapuoti, but we additionally show that next-to-leading terms in $\varepsilon$-expansions of the coefficients in the differential expression and vertex conditions can contribute to the limiting operator producing the Robin part at the vertices, to which small edges are incident. We also discuss possible generalizations of our model including both the cases of a more general geometry of the small parts of the graph and a non-analytic $\varepsilon$-dependence of the coefficients in the differential expression and vertex conditions.

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