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arXiv 2102.11468hep-th
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自由费米子的自由能与亏损$C$定理

Free energy and defect $C$-theorem in free fermion

Yoshiki Sato

摘要:

我们描述了$p$维平坦空间上自由狄拉克费米子的$p$维共形亏损作为共形等价空间$\mathbb{H}^{p+1} \times \mathbb{S}^{d-p-1}$上的边界条件。我们对允许的边界条件进行了分类,发现Dirichlet型边界条件总是存在的,而Neumann型边界条件只存在于二维缺陷。对于二维余维缺陷,双迹形变触发了从Neumann边界条件到Dirichlet边界条件的重整化群流,并且UV固定点处的自由能总是大于IR固定点处的自由能.这为DCFT中的一个构造的$C$-定理提供了进一步的支持.

英文摘要:

We describe a $p$-dimensional conformal defect of a free Dirac fermion on a $d$-dimensional flat space as boundary conditions on a conformally equivalent space $\mathbb{H}^{p+1} \times \mathbb{S}^{d-p-1}$. We classify allowed boundary conditions and find that the Dirichlet type of boundary conditions always exists while the Neumann type of boundary condition exists only for a two-codimensional defect. For the two-codimensional defect, a double trace deformation triggers a renormalization group flow from the Neumann boundary condition to the Dirichlet boundary condition, and the free energy at UV fixed point is always larger than that at IR fixed point. This provides us with further support of a conjectured $C$-theorem in DCFT.

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