| Theoretical Constraint on Purely Kinetic κ-Essence |
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| 引用本文： | 杨荣佳,张双南.Theoretical Constraint on Purely Kinetic κ-Essence[J].中国物理快报,2008,25(1):344-346. |
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| 作者姓名： | 杨荣佳 张双南 |
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| 作者单位： | [1]Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084 [2]Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049 |
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| 基金项目： | Supported in part by the Ministry of Education of China, the Directional Research Project of the Chinese Academy of Sciences under Grant No KJCX2-YW-T03, and the National Natural Science Foundation of China under Grant Nos 10521001, 10733010 and 10725313. We thank Chang-Jun Gao, Pu-Xun Wu, Hao Wei, Yan Wu, Wei-Ke Xiao, Jian-Feng Zhou, Zhi-Xing Ling, and Bi-Zhu Jiang for discussions. |
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| 摘 要： | Purely kinetic k-essence models in which the Lagrangian contains only a kinetic factor and does not depend explicitly on the field itself are considered, and a theoretical constraint is obtained： Fx -= F0a^-3. Under this theoretical constraint, we discuss a kind of purely κ-essence with form F（X） = -（1 ＋ 2X^n）^1/2n, which can be considered as the generalized tachyon field, and find that this kind of κ-essence is not likely a candidate of dark energy to describe the present accelerated expansion of the Universe. This is contrary to a previous suggestion that κ-essence with such a form may be used to describe phantom cosmologies.
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| 关 键 词： | 宇宙论 动力学 理论约束 微波传播 |
| 收稿时间： | 2007-10-13 |
Theoretical Constraint on Purely Kinetic k-Essence |
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| YANG Rong-Jia,ZHANG Shuang-Nan.Theoretical Constraint on Purely Kinetic k-Essence[J].Chinese Physics Letters,2008,25(1):344-346. |
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| Authors: | YANG Rong-Jia ZHANG Shuang-Nan |
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| Affiliation: | Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049 |
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| Abstract: | Purely kinetic k-essence models in which the Lagrangian contains only a kinetic factor and does not depend explicitly on the field itself are considered, and a theoretical constraint is obtained: Fx=F0a-3. Under this theoretical constraint, we discuss a kind of purely k-essence with form F(X)=-(1+2Xn)1/2n, which can be considered as the generalized tachyon field, and find that this kind of k-essence is not likely a candidate of dark energy to describe the present accelerated expansion of the Universe. This is contrary to a previous suggestion that k-essence with such a form may be used to describe phantom cosmologies. |
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| Keywords: | 95 36 +x 98 80 -k 98 80 Jk |
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