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arXiv 1503.05340hep-th
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引力场狄拉克海偶产生的态描述--Weyl anomaly的物理解释

A state description of pair production from Dirac sea in gravitational field --physical interpretation of Weyl anomaly--

Yoshinobu Habara, Holger B. Nielsen, Masao Ninomiya

摘要:

本文提出了用Fock空间态矢量来描述粒子对产生的方法,其中粒子对产生是从引力背景场接收能量而产生的。同时,我们还发现了一种新的机制,即在同态不变的Dirac海中,由于电子对的产生,Weyl对称性被破缺,这为Weyl反常的起源提供了一种新的物理解释。本文首先考虑两种通过Weyl变换相互连接的背景时空。结果表明,在进行Weyl变换的“弯曲”时空\underline{after}中的真空,即狄拉克海,只不过是在进行Weyl变换的“平坦”时空\underline{before}中按Fock空间基考虑的对产生态.在对每个时间片的电子对产生的贡献求和时,得到Ricci标量$R$,再将它与能量动量张量的迹部分$\left\langle T^μ_{\> μ}\right\rangle$联系起来,产生Weyl反常。

英文摘要:

We present the method that the pair production of particles is described as a Fock space state vector, where the pair production stems from receiving energy from, as an example, gravitational background field. At the same time we show a sort of new mechanism that in the diffeomorphism-invariant Dirac sea the Weyl symmetry is broken due to the pair production and this provides us a new physical interpretation of the origin of Weyl anomaly. In the present paper at the first place, we consider two kinds of background space-time which are connected each other by the Weyl transformation. It is shown that the vacuum, i.e. Dirac sea, in the "curved" space-time \underline{after} making Weyl transformation is nothing but the pair produced state provided we consider the state in terms of the Fock space basis in the "flat" space-time \underline{before} making the Weyl transformation. When summing up with respect to the time the contribution of pair production of each time-slice we obtain the Ricci scalar $R$ and then it is related to the trace part $\left\langle T^μ_{\> μ}\right\rangle$ of the energy-momentum tensor to produce Weyl anomaly.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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