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arXiv 1706.01871hep-thcond-mat.stat-mechmath-phmath.MP
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非幺正量子场论中重整化群流的不可逆性

Irreversibility of the renormalization group flow in non-unitary quantum field theory

Olalla A. Castro-Alvaredo, Benjamin Doyon, Francesco Ravanini

摘要:

我们证明了非酉但${\cal PT}$不变的量子场论在两个时空维中的重整化群流的不可逆性。除了不破缺的$\mathcal{PT}$对称性和正能谱外,我们还假设了量子场论的标准性质,包括局部能量动量张量和相对论不变性。这将Zamolodchikov的$c$ -定理推广到${\cal PT}$ -对称哈密顿量。我们的证明密切遵循Zamolodchikov的论点。我们证明了重整化群参数$s$的函数$c_{\mathrm{eff}}(s)$是非负的,并且沿着重整化群流单调递减。它在临界点的值是进入比自由能的“有效中心电荷“。至少在有理模型中,这等于$c_{\mathrm{eff}}=c-24Δ$,其中$c$是中心电荷,$Δ$是描述临界点的共形场论中最低的主场维数。

英文摘要:

We show irreversibility of the renormalization group flow in non-unitary but ${\cal PT}$-invariant quantum field theory in two space-time dimensions. In addition to unbroken $\mathcal{PT}$-symmetry and a positive energy spectrum, we assume standard properties of quantum field theory including a local energy-momentum tensor and relativistic invariance. This generalizes Zamolodchikov's $c$-theorem to ${\cal PT}$-symmetric hamiltonians. Our proof follows closely Zamolodchikov's arguments. We show that a function $c_{\mathrm{eff}}(s)$ of the renormalization group parameter $s$ exists which is non-negative and monotonically decreasing along renormalization group flows. Its value at a critical point is the "effective central charge" entering the specific free energy. At least in rational models, this equals $c_{\mathrm{eff}}=c-24Δ$, where $c$ is the central charge and $Δ$ is the lowest primary field dimension in the conformal field theory which describes the critical point.

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