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arXiv 2407.11552hep-thhep-ph
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全息 Lifshitz 流

Holographic Lifshitz flows

Matteo Baggioli, Oriol Pujolas, Xin-Meng Wu

AI总结:

本文研究了无 Lorentz 不变性全息模型中的重整化群流,发现引入带自耦合的大质量矢量场能促进 Lorentz 对称性在 IR 中的高效涌现,并构建了具有不动点线的全息模型,验证了 a-function 的单调性。

摘要:

在没有 Lorentz 对称性的情况下,重整化群(RG)的通用不动点由其动力学(或 `Lifshitz`)指数 $z$ 标记。因此,产生了丰富多样的可能 RG 流。第一个例子已经由标准的非相对论极限给出,它可以被视为从 $z=1$ 的 UV 不动点到 $z=2$ 的 IR 不动点的流。在强耦合理论中,有充分的论据表明 Lorentz 不变性可以在 IR 中从破坏 Lorentz 的 UV 中动态涌现。在这项工作中,我们在没有 Lorentz 不变性的最小 bottom-up 全息模型中对不动点及其间可能的 RG 流进行了通用研究,旨在阐明可能的选项及相关唯象学。我们发现:i) 对先前涉及带有允许自耦合的大质量矢量场的模型进行微小推广,使得 Lorentz 不变性的涌现比先前的尝试高效得多。此外,我们发现通常 UV 动力学指数 $z_{UV}$ 越大,IR 中 Lorentz 对称性恢复得越快。ii) 我们显式构建了一个具有不动点线的全息模型,沿该线实现不同的 Lifshitz 标度。iii) 我们还确认了最近提出的 a-function 沿着我们所有破坏 Lorentz 的 RG 流的单调性。

英文摘要:

Without Lorentz symmetry, generic fixed points of the renormalization group (RG) are labelled by their dynamical (or `Lifshitz') exponent $z$. Hence, a rich variety of possible RG flows arises. The first example is already given by the standard non-relativistic limit, which can be viewed as the flow from a $z=1$ UV fixed point to a $z=2$ IR fixed point. In strongly coupled theories, there are good arguments suggesting that Lorentz invariance can emerge dynamically in the IR from a Lorentz violating UV. In this work, we perform a generic study of fixed points and the possible RG flows among them in a minimal bottom-up holographic model without Lorentz invariance, aiming to shed light on the possible options and the related phenomenology. We find: i) A minor generalization of previous models involving a massive vector field with allowed self-couplings leads to a much more efficient emergence of Lorentz invariance than in the previous attempts. Moreover, we find that generically the larger is the UV dynamical exponent $z_{UV}$ the faster is the recovery of Lorentz symmetry in the IR. ii) We construct explicitly a holographic model with a line of fixed points, realizing different Lifshitz scaling along the line. iii) We also confirm the monotonicity of a recently proposed a-function along all our Lorentz violating RG flows.

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