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arXiv 2010.04729hep-thgr-qchep-ph
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来自隐藏扇区和TT变形的紧急重力

Emergent gravity from hidden sectors and TT deformations

Panos Betzios, Elias Kiritsis, Vasilis Niarchos

摘要:

我们调查紧急重力扩展的AdS/CFT对应的范例。突现引力子与能量动量张量的(动力学)期望值相关联。我们推导出这种动力学的一般有效描述,并将其应用于隐藏理论产生引力耦合到标准模型的情况。在线性化的描述中,一般来说,这样的引力是有质量的,存在额外的标量自由度。自旋2和自旋0模的传播子都是正的,并且定义良好。与之相关的突现引力理论是一种双引力理论,就像(秘密地)全息术中的情况一样。量子场论定义的背景度规扮演着暗能量的角色,而突现理论总是将原始的背景度规作为一种解决方案。在隐藏理论是全息的情况下,整体描述产生了耦合到膜的高维体理论。膜上的有效引力子在紫外和红外波段都具有四维特性,并且总是有质量的。

英文摘要:

We investigate emergent gravity extending the paradigm of the AdS/CFT correspondence. The emergent graviton is associated to the (dynamical) expectation value of the energy-momentum tensor. We derive the general effective description of such dynamics, and apply it to the case where a hidden theory generates gravity that is coupled to the Standard Model. In the linearized description, generically, such gravity is massive with the presence of an extra scalar degree of freedom. The propagators of both the spin-two and spin-zero modes are positive and well defined. The associated emergent gravitational theory is a bi-gravity theory, as is (secretly) the case in holography. The background metric on which the QFTs are defined, plays the role of dark energy and the emergent theory has always as a solution the original background metric. In the case where the hidden theory is holographic, the overall description yields a higher-dimensional bulk theory coupled to a brane. The effective graviton on the brane has four-dimensional characteristics both in the UV and IR and is always massive.

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