高阶正则引力中的简并Hamilton算子--问题与解决
Degenerate Hamiltonian operator in higher-order canonical gravity -- the problem and a remedy
摘要：
通往经典理论的正则表述的不同路线导致不同的正则等价哈密顿量，而它们的量子对应物通过适当的么正变换相关联。然而，对于高阶引力理论，虽然两个从相同作用量中产生的哈密顿量通过正则变换联系在一起，但是当试图正则量子化时，这种差异就会出现，这在非最小耦合的高阶引力理论中占主导地位。我们按照狄拉克的约束分析，制定相空间结构，在存在（情况-I）和不存在（情况-II）的总衍生条款。虽然耦合参数在情况I中没有显著的作用，但在情况II中量子化明显依赖于它的形式，因此，与两者相关的酉变换不是唯一的。我们发现一定的数学不一致的情况下，我，特别是修改后的高斯-邦纳-伸缩耦合作用。因此，我们得出结论，总导数项确实在量子域中发挥了重要作用，为了保持一致性，应该先验地加以考虑。
英文摘要：
Different routes towards the canonical formulation of a classical theory result in different canonically equivalent Hamiltonians, while their quantum counterparts are related through appropriate unitary transformation. However, for higher-order theory of gravity, although two Hamiltonians emerging from the same action differing by total derivative terms are related through canonical transformation, the difference transpires while attempting canonical quantization, which is predominant in non-minimally coupled higher-order theory of gravity. We follow Dirac's constraint analysis to formulate phase-space structures, in the presence (case-I) and absence (case-II) of total derivative terms. While the coupling parameter plays no significant role as such for case-I, quantization depends on its form explicitly in case-II, and as a result, unitary transformation relating the two is not unique. We find certain mathematical inconsistency in case-I, for modified Gauss-Bonnet-Dilatonic coupled action, in particular. Thus, we conclude that total derivative terms indeed play a major role in the quantum domain and should be taken care of a-priori, for consistency.
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