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arXiv math-ph/0702089math-phmath.MPnlin.SI
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Calogero-Sutherland型系统的奇异本征函数及其正则化

Singular Eigenfunctions of Calogero-Sutherland Type Systems and How to Transform Them into Regular Ones

Edwin Langmann

摘要:

存在一大类卡洛格罗-萨瑟兰型量子多体系统,其中所有粒子可以具有不同的质量和耦合常数,但它们仍然可以显式地构造出一组完整的(在某种意义上)精确本征函数和相应的本征值。当然,这个结果有一个陷阱:如果坚持这些本征函数是平方可积的,那么相应的哈密顿量必然是非厄米的(因此提供了一个精确可解的PT对称量子多体系统的例子),如果坚持哈密顿量是厄米的,那么本征函数是奇异的,因此不能作为量子力学本征函数。标准的卡洛格罗-萨瑟兰哈密顿量是特殊的,由于存在一个积分算子,它允许将这些奇异的本征函数转换为正规的。

英文摘要:

There exists a large class of quantum many-body systems of Calogero-Sutherland type where all particles can have different masses and coupling constants and which nevertheless are such that one can construct a complete (in a certain sense) set of exact eigenfunctions and corresponding eigenvalues, explicitly. Of course there is a catch to this result: if one insists on these eigenfunctions to be square integrable then the corresponding Hamiltonian is necessarily non-hermitean (and thus provides an example of an exactly solvable PT-symmetric quantum-many body system), and if one insists on the Hamiltonian to be hermitean then the eigenfunctions are singular and thus not acceptable as quantum mechanical eigenfunctions. The standard Calogero-Sutherland Hamiltonian is special due to the existence of an integral operator which allows to transform these singular eigenfunctions into regular ones.

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