Quintessence, cosmic coincidence, and the cosmological constant
Quintessence, cosmic coincidence, and the cosmological constant
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DOI：
10.1103/physrevlett.82.896
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发表时间：
1998-07
影响因子：
8.6
通讯作者：
I. Zlatev;Limin Wang;Paul J. Steinhardt University of Pennsylvania;P. University
中科院分区：
文献类型：
--
作者：
I. Zlatev;Limin Wang;Paul J. Steinhardt University of Pennsylvania;P. University
最近的观测表明，宇宙能量密度的很大一部分具有负压。一种解释是真空能量密度；另一种是以标量场的形式缓慢演变成势的精粹。无论哪种情况，一个关键问题是解释为什么能量密度几乎与今天的物质密度一致。随着宇宙的膨胀，密度以不同的速率下降，所以今天的巧合似乎要求它们的比例在宇宙早期被设定为一个特定的、无限小的值。在本文中，我们引入了{open_quotes}跟踪字段的概念，{close_quotes}是quintessence的一种形式，并展示了它如何解释巧合，为quintessence场景添加了新的动机。{版权所有}{ital 1999} {ital美国物理学会}
Recent observations suggest that a large fraction of the energy density of the Universe has negative pressure. One explanation is vacuum energy density; another is quintessence in the form of a scalar field slowly evolving down a potential. In either case, a key problem is to explain why the energy density nearly coincides with the matter density today. The densities decrease at different rates as the Universe expands, so coincidence today appears to require that their ratio be set to a specific, infinitesimal value in the early Universe. In this paper, we introduce the notion of a {open_quotes}tracker field,{close_quotes} a form of quintessence, and show how it may explain the coincidence, adding new motivation for the quintessence scenario. {copyright} {ital 1999} {ital The American Physical Society}