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arXiv 1703.01591hep-thcond-mat.other
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精确重整化群与Sine Gordon理论

Exact Renormalization Group and Sine Gordon Theory

Prafulla Oak, B. Sathiapalan

摘要:

精确重整化群被用来研究场论中的RG量流。基本思想是写一个演化算子的流动和评估它在微扰理论。这比直接求解微分方程要容易得多。通过再现四维$ϕ^4$场论和二维Sine-Gordon理论中的已知结果来说明这一点。结果表明,β函数的计算得到了一定的简化.该方法也被用于计算二维Sine-Gordon理论中的c函数。这与文献中计算c-函数的其他方法一致。如果将CFT的中心荷与二维中的纠缠熵之间的联系外推到受扰CFT的c函数,则可以得到与arXiv:1610.04233中的早期计算(包括使用全息术的计算)完全一致的Sine-Gordon理论中的纠缠熵值。

英文摘要:

The exact renormalization group is used to study the RG flow of quantities in field theories. The basic idea is to write an evolution operator for the flow and evaluate it in perturbation theory. This is easier than directly solving the differential equation. This is illustrated by reproducing known results in four dimensional $ϕ^4$ field theory and the two dimensional Sine-Gordon theory. It is shown that the calculation of beta function is somewhat simplified. The technique is also used to calculate the c-function in two dimensional Sine-Gordon theory. This agrees with other prescriptions for calculating c-functions in the literature. If one extrapolates the connection between central charge of a CFT and entanglement entropy in two dimensions, to the c-function of the perturbed CFT, then one gets a value for the entanglement entropy in Sine-Gordon theory that is in exact agreement with earlier calculations (including one using holography) in arXiv:1610.04233.

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