论文标题
重力作为无间隙相和双形对称性
Gravity as a gapless phase and biform symmetries
论文作者
论文摘要
我们研究有效的野外理论(EFT)享受(最大)bourily对称性。这些是由具有保守的(电)电流的存在来定义的,该电流具有幼小的图表的对称性,其长度相等。当这些理论还具有拓扑(磁性)biform电流时,其保护定律是异常的。我们继续表明,这种混合的异常唯一固定了电流和磁电流之间的两点函数。然后,我们对电流相关器进行Källén-Lehmann光谱分解,证明光谱中存在无质量模式,其无质量受到异常的保护。此外,异常产生了EFT的普遍形式,其最相关的术语类似于线性爱因斯坦的作用,主导了红外物理学。作为这种一般形式主义的应用,我们研究了加里龙超流体和线性重力的理论。因此,人们可以将重力的无质量视为受到异常的bouriper对称性的保护。相关的EFT在物理对称性方面提供了一个低能量重力的组织原理,并允许与线性差异不变性一致的相互作用。这些理论不是紫外线的完整,相关的对称性可以被视为新兴,也不包括使它们完全差异不变所需的非线性,因此与量子重力不能具有任何全局符号的期望没有矛盾。
We study effective field theories (EFTs) enjoying (maximal) biform symmetries. These are defined by the presence of a conserved (electric) current that has the symmetries of a Young tableau with two columns of equal length. When these theories also have a topological (magnetic) biform current, its conservation law is anomalous. We go on to show that this mixed anomaly uniquely fixes the two-point function between the electric and magnetic currents. We then perform a Källén-Lehmann spectral decomposition of the current-current correlator, proving that there is a massless mode in the spectrum, whose masslessness is protected by the anomaly. Furthermore, the anomaly gives rise to a universal form of the EFT whose most relevant term, which resembles the linear Einstein action, dominates the infrared physics. As applications of this general formalism, we study the theories of a Galileon superfluid and linearized gravity. Thus, one can view the masslessness of the graviton as being protected by the anomalous biform symmetries. The associated EFT provides an organizing principle for gravity at low energies in terms of physical symmetries, and allows interactions consistent with linearized diffeomorphism invariance. These theories are not ultraviolet-complete, the relevant symmetries can be viewed as emergent, nor do they include the nonlinearities necessary to make them fully diffeomorphism invariant, so there is no contradiction with the expectation that quantum gravity cannot have any global symmetries.