Symmetries and conservation laws in non-Hermitian field theories

Symmetries and conservation laws in non-Hermitian field theories
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非厄米场论中的对称性和守恒定律

DOI:
10.1103/physrevd.96.065027
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发表时间:
2017
期刊:
影响因子:
5
通讯作者:
Alexandre J
Alexandre J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Alexandre J

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反厄米质量条款被认为是,除了厄米的,对称的复标量和费米子场理论。在这两种情况下,拉格朗日量可以写在一个明显的对称形式的共轭变量,允许一个明确的定义的运动方程。在讨论所产生的约束变分过程的一致性,我们表明,一个连续的对称变换下的非厄米拉格朗日的不变性并不意味着存在相应的保守电流。守恒电流存在,但这些都与变换下的拉格朗日不是不变的,反映了众所周知的解释对称理论的系统与增益和损失。一个正式的理解这个不寻常的功能,非厄米理论需要一个仔细的治疗诺特定理,我们给出具体的例子来说明。
Anti-Hermitian mass terms are considered, in addition to Hermitian ones, for-symmetric complex-scalar and fermionic field theories. In both cases, the Lagrangian can be written in a manifestly symmetric form in terms of the-conjugate variables, allowing for an unambiguous definition of the equations of motion. After discussing the resulting constraints on the consistency of the variational procedure, we show that the invariance of a non-Hermitian Lagrangian under a continuous symmetry transformation does not imply the existence of a corresponding conserved current. Conserved currents exist, but these are associated with transformations under which the Lagrangian is not invariant and which reflect the well-known interpretation of-symmetric theories in terms of systems with gain and loss. A formal understanding of this unusual feature of non-Hermitian theories requires a careful treatment of Noether’s theorem, and we give specific examples for illustration.
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影响因子: --
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