Cosmic acceleration in the nonlocal approach to the cosmological constant problem
Cosmic acceleration in the nonlocal approach to the cosmological constant problem
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DOI：
10.1140/epjc/s10052-018-5780-6
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
I. Oda
中科院分区：
文献类型：
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作者：
I. Oda
我们最近构造了一个明显的局域公式，用于解决宇宙常数问题的非局域方法，它可以处理来自物质和引力场的量子效应。在这个公式中，已经明确地表明，即使在存在引力环效应的情况下，有效宇宙常数也是辐射稳定的。由于我们自然而然地被引导将项和相应的拓扑力添加到原始作用中，我们利用这个公式来解释在具有无限时空体积的开放宇宙中宇宙膨胀的后期加速。我们将看到，当作为额外标量场存在于引力中的“标量”具有数量级的微小质量时，我们可以以一致的方式解释宇宙常数的当前值。
We have recently constructed a manifestly local formulation of a nonlocal approach to the cosmological constant problem which can treat with quantum effects from both matter and gravitational fields. In this formulation, it has been explicitly shown that the effective cosmological constant is radiatively stable even in the presence of the gravitational loop effects. Since we are naturally led to add theterm and the corresponding topological action to an original action, we make use of this formulation to account for the late-time acceleration of expansion of the universe in case of the open universes with infinite space-time volume. We will see that when the “scalaron”, which exists in thegravity as an extra scalar field, has a tiny mass of the order of magnitude, we can explain the current value of the cosmological constant in a consistent manner.