Effective gravitational couplings for cosmological perturbations in generalized Proca theories
文献类型：期刊论文
| 作者 | De Felice, Antonio1; Heisenberg, Lavinia2; Kase, Ryotaro3; Mukohyama, Shinji1,4; Tsujikawa, Shinji3; Zhang, Ying-li5,6
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| 刊名 | PHYSICAL REVIEW D
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| 出版日期 | 2016-08-11 |
| 卷号 | 94期号:4 |
| 英文摘要 | We consider the finite interactions of the generalized Proca theory including the sixth-order Lagrangian and derive the full linear perturbation equations of motion on the flat Friedmann-Lemaltre-RobertsonWalker background in the presence of a matter perfect fluid. By construction, the propagating degrees of freedom (besides the matter perfect fluid) are two transverse vector perturbations, one longitudinal scalar, and two tensor polarizations. The Lagrangians associated with intrinsic vector modes neither affect the background equations of motion nor the second-order action of tensor perturbations, but they do give rise to nontrivial modifications to the no-ghost condition of vector perturbations and to the propagation speeds of vector and scalar perturbations. We derive the effective gravitational coupling G(eff) with matter density perturbations under a quasistatic approximation on scales deep inside the sound horizon. Wc find that the existence of intrinsic vector modes allows a possibility for reducing G(eff). in fact, within the parameter space, G(eff) can be even smaller than the Newton gravitational constant G at the late cosmological epoch, with a peculiar phantom dark energy equation of state (without ghosts). The modifications to the slip parameter eta and the evolution of the growth rate f sigma(8) are discussed as well. Thus, dark energy models in the framework of generalized Proca theories can be observationally distinguished from the ACDM model according to both cosmic growth and expansion history. Furthermore, we study the evolution of vector perturbations and show that outside the vector sound horizon the perturbations are nearly frozen and start to decay with oscillations after the horizon entry. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 研究领域[WOS] | Astronomy & Astrophysics ; Physics |
| 关键词[WOS] | REDSHIFT SPACE DISTORTIONS ; SCALAR-TENSOR THEORY ; EQUATION-OF-STATE ; FIELD-EQUATIONS ; GROWTH-RATE ; POWER SPECTRUM ; DARK ENERGY ; GRAVITY ; GALAXIES ; CONSTANT |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000381415600006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6865]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys, Kyoto 6068502, Japan 2.ETH, Inst Theoret Studies, Clausiusstr 47, CH-8092 Zurich, Switzerland 3.Tokyo Univ Sci, Fac Sci, Dept Phys, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan 4.Univ Tokyo, Univ Tokyo Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England |
| 推荐引用方式 GB/T 7714 | De Felice, Antonio,Heisenberg, Lavinia,Kase, Ryotaro,et al. Effective gravitational couplings for cosmological perturbations in generalized Proca theories[J]. PHYSICAL REVIEW D,2016,94(4). |
| APA | De Felice, Antonio,Heisenberg, Lavinia,Kase, Ryotaro,Mukohyama, Shinji,Tsujikawa, Shinji,&Zhang, Ying-li.(2016).Effective gravitational couplings for cosmological perturbations in generalized Proca theories.PHYSICAL REVIEW D,94(4). |
| MLA | De Felice, Antonio,et al."Effective gravitational couplings for cosmological perturbations in generalized Proca theories".PHYSICAL REVIEW D 94.4(2016). |
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来源：国家天文台
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