Spectral Theory of the Klein–Gordon Equation in Pontryagin Spaces
Spectral Theory of the Klein–Gordon Equation in Pontryagin Spaces
复制标题
Pontryagin空间中KleinâGordon方程的谱论
DOI:
10.1007/s00220-006-0022-4
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发表时间:
2006
影响因子:
2.4
通讯作者:
Tretter
中科院分区:
文献类型:
--
作者:
Langer;Najman;Tretter
In this paper we investigate an abstract Klein–Gordon equation by means of indefinite inner product methods. We show that, under certain assumptions on the potential which are more general than in previous works, the corresponding linear operatorAis self-adjoint in the Pontryagin spaceinduced by the so-called energy inner product. The operatorApossesses a spectral function with critical points, the essential spectrum ofAis real with a gap around 0, and the non-real spectrum consists of at most finitely many pairs of complex conjugate eigenvalues of finite algebraic multiplicity; the number of these pairs is related to the ‘size’ of the potential. Moreover,Agenerates a group of bounded unitary operators in the Pontryagin space. Finally, the conditions on the potential required in the paper are illustrated for the Klein–Gordon equation in; they include potentials consisting of a Coulomb part and anLp-part withn≤p< ∞.
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