THEORETICAL MODELS OF DARK ENERGY

被引：194

作者：

Yoo, Jaewon ^{[1
]}

Watanabe, Yuki ^{[2
]}

机构：

[1] Univ Munich, Arnold Sommerfeld Ctr Theoret Phys, D-80333 Munich, Germany

[2] Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2012年 / 21卷 / 12期

关键词：

Cosmology; cosmological constant; dark energy; modified gravity; cosmological models; PROBE WMAP OBSERVATIONS; HUBBLE-SPACE-TELESCOPE; DIGITAL SKY SURVEY; SUPERNOVA LEGACY SURVEY; COSMOLOGICAL CONSTANT; IA SUPERNOVAE; LIGHT CURVES; COSMIC SHEAR; CONSTRAINTS; ANISOTROPY;

D O I：

10.1142/S0218271812300029

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Mounting observational data confirm that about 73% of the energy density consists of dark energy which is responsible for the current accelerated expansion of the Universe. We present observational evidences and dark energy projects. We then review various theoretical ideas that have been proposed to explain the origin of dark energy; they contain the cosmological constant, modified matter models, modified gravity models and the inhomogeneous model. The cosmological constant suffers from two major problems: one regarding fine-tuning and the other regarding coincidence. To solve them there arose modified matter models such as quintessence, k-essence, coupled dark energy and unified dark energy. We compare those models by presenting attractive aspects, new rising problems and possible solutions. Furthermore, we review modified gravity models that lead to late-time accelerated expansion without invoking a new form of dark energy; they contain f(R) gravity and the Dvali-Gabadadze-Porrati (DGP) model. We also discuss observational constraints on those models and on future modified gravity theories. Finally we review the inhomogeneous Lemaitre-Tolman-Bondi (LTB) model that drops an assumption of the spatial homogeneity of the Universe. We also present basics of cosmology and scalar field theory, which are useful especially for students and novices to understand dark energy models.

引用

页数：53

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