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arXiv 0704.1084hep-th
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真空能与边缘重正化

Vacuum Energy and Renormalization on the Edge

M. Asorey, D. Garcia-Alvarez, J. M. Munoz-Castaneda

摘要:

本文从一般的观点分析了量子场论中真空对边界条件的依赖性。从这个角度来看,重整化规定不仅意味着重整化的耦合的理论,但也出现在边界条件的空间中的流动。对于规则边界,这个流有大量的不动点,没有循环轨道。不动点族包括Neumann和Dirichlet边界条件。在一维场论中,伪周期和拟周期边界条件也是RG不动点。在这些条件下,无质量玻色自由场论是共形不变的。在所有不动点中,只有Neumann边界条件是红外稳定不动点。所有其他的共形不变边界条件在一些相关的扰动下变得不稳定。在有限体积中,我们分析了真空能量沿重整化群流轨迹的依赖性,为暗能量演化提供了一个有趣的框架。相反,在一维共形不变玻色子理论中,边界上的重整化群流并不影响真空的纠缠熵的主导行为。

英文摘要:

The vacuum dependence on boundary conditions in quantum field theories is analysed from a very general viewpoint. From this perspective the renormalization prescriptions not only imply the renormalization of the couplings of the theory in the bulk but also the appearance of a flow in the space of boundary conditions. For regular boundaries this flow has a large variety of fixed points and no cyclic orbit. The family of fixed points includes Neumann and Dirichlet boundary conditions. In one-dimensional field theories pseudoperiodic and quasiperiodic boundary conditions are also RG fixed points. Under these conditions massless bosonic free field theories are conformally invariant. Among all fixed points only Neumann boundary conditions are infrared stable fixed points. All other conformal invariant boundary conditions become unstable under some relevant perturbations. In finite volumes we analyse the dependence of the vacuum energy along the trajectories of the renormalization group flow providing an interesting framework for dark energy evolution. On the contrary, the renormalization group flow on the boundary does not affect the leading behaviour of the entanglement entropy of the vacuum in one-dimensional conformally invariant bosonic theories.

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