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arXiv 1905.01355hep-thcond-mat.stat-mech
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动量空间中的热CFTs

Thermal CFTs in momentum space

Andrea Manenti

摘要:

本文研究了动量空间中有限温度下的共形场论。给出了热共形块的傅里叶变换公式,并研究了其解析性质。特别是,我们表明,傅里叶变换消失时的共形尺寸和自旋是那些“双扭”运营商$Δ= 2Δ_ϕ+ \ell + 2n$。通过分析继续洛伦兹签名,我们表明,在高空间动量的频谱密度的频谱条件$|ω| > |k|$的支持。这就引出了一系列的求和规则。最后,我们明确匹配的热块膨胀与动量空间格林函数在有限温度下的几个例子。

英文摘要:

We study some aspects of conformal field theories at finite temperature in momentum space. We provide a formula for the Fourier transform of a thermal conformal block and study its analytic properties. In particular we show that the Fourier transform vanishes when the conformal dimension and spin are those of a "double twist" operator $Δ= 2Δ_ϕ+ \ell + 2n$. By analytically continuing to Lorentzian signature we show that the spectral density at high spatial momenta has support on the spectrum condition $|ω| > |k|$. This leads to a series of sum rules. Finally, we explicitly match the thermal block expansion with the momentum space Green's function at finite temperature in several examples.

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