第一千零七十五章以太释放
Aether Unleashed
摘要：
我们遵循一个低能量有效的理论方法，以确定一般类的理论，描述了一个向量场（无约束规范）耦合到重力。由此产生的集合可以被看作是传统的矢量张量理论的推广，并作为以太模型的高动量完成。我们研究的条件，一个可行的宇宙学，牛顿极限和经典和量子不稳定性的情况下施加在我们的模型类的参数，并比较这些约束与以前研究和相关的情况下得出的。最严格的条件来自理论的量子稳定性，它只允许非麦克斯韦动力学项的动力学宇宙学解。牛顿极限下的引力常量变成了尺度依赖性的，这表明了与暗物质和退化的联系。这类理论有非常丰富的引力现象学，并提供了一个充足但简单的试验场来研究引力的修改及其宇宙学意义。
英文摘要：
We follow a low-energy effective theory approach to identify the general class of theories that describes a vector field (of unconstrained norm) coupled to gravity. The resulting set may be regarded as a generalization of the conventional vector-tensor theories, and as a high-momentum completion of aether models. We study the conditions that a viable cosmology, Newtonian limit and absence of classical and quantum instabilities impose on the parameters of our class of models, and compare these constraints with those derived in previously studied and related cases. The most stringent conditions arise from the quantum stability of the theory, which allows dynamical cosmological solutions only for a non-Maxwellian kinetic term. The gravitational constant in the Newtonian limit turns to be scale dependent, suggesting connections to dark matter and degravitation. This class of theories has a very rich gravitational phenomenology, and offers an ample but simple testing ground to study modifications of gravity and their cosmological implications.
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