论文标题
有和无限制的宇宙加速
Cosmic Acceleration with and without Limits
论文作者
论文摘要
一种新颖的，有趣的标量张量重力理论是对场运动有限的那些，标量场要么达到恒定加速度或停止加速并达到恒定速度。我们将它们与动态取消高能量宇宙常数的能力相结合，例如通过训练有素或自我调谐方法。尽管宇宙学较长，但仍可以成功地拥有宇宙扩展历史，尽管宇宙学的恒定较长，但延迟的时间加速了，尽管较晚的保姆限制可能不稳定。极端模型（例如在狄拉克出生的污染作用中）对于宇宙速度限制特别感兴趣。
A novel, interesting class of scalar-tensor gravity theories is those with a limit on the field motion, where the scalar field either goes to a constant acceleration or stops accelerating and goes to a constant velocity. We combine these with the ability to dynamically cancel a high energy cosmological constant, e.g. through the well tempered or self tuning approaches. One can successfully have a cosmic expansion history with a matter dominated epoch and late time acceleration despite a large cosmological constant, although the late time de Sitter limit may be unstable. Pole models, such as in a Dirac-Born-Infeld action, are of particular interest for a cosmic speed limit.
