The diagonal form clearly exhibits a symmetry between the positive and negative parts of the spectrum of a "Diracoperator with supersymmetry".
对角化形式清楚表现出“带超对称的狄拉克算子”光谱的正负粒子的对称性。
2
In Sect. 4.3.4 we show that the Diracoperator in an external field has the same essential spectrum as the free Diracoperator provided the potential vanishes at infinity.