Trace anomalies in chiral theories revisited
Trace anomalies in chiral theories revisited
复制标题
重新审视手性理论中的痕量异常
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
B. L. Souza
中科院分区：
文献类型：
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作者：
L. Bonora;S. Giaccari;B. L. Souza
由于在引力耦合理论中寻找能量动量张量迹中可能的CP破坏项，我们重新讨论了手征理论中的迹反常问题。我们重新计算了后者，并确定，在跟踪的能量动量张量的手征费米子在一个循环的庞特里亚金密度出现与虚系数的理论。我们认为，这可能会打破么正性，在这种情况下，跟踪异常被用作理论的选择性标准，类似于规范理论中的手征异常。我们分析了这一事实的一些显着的后果，似乎已经被忽视的文献。
A bstractMotivated by the search for possible CP violating terms in the trace of the energy-momentum tensor in theories coupled to gravity we revisit the problem of trace anomalies in chiral theories. We recalculate the latter and ascertain that in the trace of the energy-momentum tensor of theories with chiral fermions at one-loop the Pontryagin density appears with an imaginary coefficient. We argue that this may break unitarity, in which case the trace anomaly has to be used as a selective criterion for theories, analogous to the chiral anomalies in gauge theories. We analyze some remarkable consequences of this fact, that seem to have been overlooked in the literature.