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arXiv 1504.07997hep-thcond-mat.stat-mechcond-mat.str-elhep-lat
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引导O(N)群岛

Bootstrapping the O(N) Archipelago

Filip Kos, David Poland, David Simmons-Duffin, Alessandro Vichi

摘要:

我们研究了具有$O(N)$全局对称性的三维CFTs,并利用共形引导方法对混合系统进行了研究。具体来说,我们认为所有非零标量四点函数包含最低维$O(N)$向量$ϕ_i$和最低维$O(N)$单线$s$,假设是唯一相关的运营商在其对称表示。这些四点函数的交叉对称性和么正性的约束迫使标度维数$(Δ_ϕ, Δ_s)$位于小岛内。我们还作出严格的测定目前的两点功能的$O(2)$和$O(3)$模型,应用到凝聚态系统中的运输。

英文摘要:

We study 3d CFTs with an $O(N)$ global symmetry using the conformal bootstrap for a system of mixed correlators. Specifically, we consider all nonvanishing scalar four-point functions containing the lowest dimension $O(N)$ vector $ϕ_i$ and the lowest dimension $O(N)$ singlet $s$, assumed to be the only relevant operators in their symmetry representations. The constraints of crossing symmetry and unitarity for these four-point functions force the scaling dimensions $(Δ_ϕ, Δ_s)$ to lie inside small islands. We also make rigorous determinations of current two-point functions in the $O(2)$ and $O(3)$ models, with applications to transport in condensed matter systems.

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