Observational signatures of f(R) dark energy models that satisfy cosmological and local gra.pdfVIP

下载本文档

4
0
约5.31万字
约 13页
2017-04-05 发布于江苏
举报
版权申诉

Observational signatures of f(R) dark energy models that satisfy cosmological and local gra.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Observational signatures of f(R) dark energy models that satisfy cosmological and local gra

a r X i v : 0 7 0 9 .1 3 9 1 v 2 [ a s t r o - p h ] 1 9 N o v 2 0 0 7 Observational signatures of f(R) dark energy models that satisfy cosmological and local gravity constraints Shinji Tsujikawa1 1Department of Physics, Gunma National College of Technology, Gunma 371-8530, Japan (Dated: February 1, 2008) We discuss observational consequences of f(R) dark energy scenarios that satisfy local gravity constraints (LGC) as well as conditions of the cosmological viability. The model we study is given by m(r) = C(?r ? 1)p (C 0, p 1) with m = Rf,RR/f,R and r = ?Rf,R/f , which cover viable f(R) models proposed so far in a high-curvature region designed to be compatible with LGC. The equation of state of dark energy exhibits a divergence at a redshift zc that can be as close as a few while satisfying sound horizon constraints of Cosmic Microwave Background (CMB). We study the evolution of matter density perturbations in details and place constraints on model parameters from the difference of spectral indices of power spectra between CMB and galaxy clustering. The models with p ≥ 5 can be consistent with those observational constraints as well as LGC. We also discuss the evolution of perturbations in the Ricci scalar R and show that an oscillating mode (scalaron) can easily dominate over a matter-induced mode as we go back to the past. This violates the stability of cosmological solutions, thus posing a problem about how the over-production of scalarons should be avoided in the early universe. I. INTRODUCTION The origin of dark energy (DE) has persistently been one of the most serious problems in cosmology [1, 2]. Many DE models have been proposed so far, but we have not found any strong evidence to support that such mod- els are better than cosmological constant. Thus the first step towards the understanding of the origin of DE is to find the departure from the ΛCDM model. The simplest modification to the ΛCDM model is per- haps so-called f(R) gravity in which the