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arXiv 2009.02157hep-thgr-qc
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无标标量理论的对称性

Symmetries for scalarless scalar theories

Gianmassimo Tasinato

摘要:

我们认为理论包含标量场相互作用的矢量或张量自由度,配备对称性,防止传播的线性标量激发周围的解决方案的运动方程。我们首先研究的意义,这种对称性的建设向量理论,打破阿贝尔规范不变性,而不一定激发纵向标量波动在平坦的空间。然后,我们研究弯曲空间中的标量张量理论,并将我们考虑的对称性与作用于标量模式的破时空对称性的非线性实现联系起来。我们确定充分条件的时空几何,以避免标量波动的传播。我们分析了球对称黑洞周围的线性扰动,证明了标量激发的情况下,并指出修改自旋2波动的动力学相对于爱因斯坦引力。然后,我们研究这种设置的暗能量问题的后果,确定标量约束的宇宙学配置,可以导致自加速宇宙的膨胀是不敏感的裸宇宙学常数的值。

英文摘要:

We consider theories containing scalar fields interacting with vector or with tensor degrees of freedom, equipped with symmetries that prevent the propagation of linearized scalar excitations around solutions of the equations of motion. We first study the implications of such symmetries for building vector theories that break Abelian gauge invariance without necessarily exciting longitudinal scalar fluctuations in flat space. We then examine scalar-tensor theories in curved space, and relate the symmetries we consider with a non-linear realization of broken space-time symmetries acting on scalar modes. We determine sufficient conditions on the space-time geometry to avoid the propagation of scalar fluctuations. We analyze linearized perturbations around spherically symmetric black holes, proving the absence of scalar excitations, and pointing out modifications in the dynamics of spin-2 fluctuations with respect to Einstein gravity. We then study consequences of this set-up for the dark energy problem, determining scalar constraints on cosmological configurations that can lead to self-accelerating universes whose expansion is insensitive to the value of the bare cosmological constant.

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