| What do we know about cosmography | |
| Zhang, Ming-Jian1; Li, Hong1; Xia, Jun-Qing2 | |
| 刊名 | European physical journal c
 |
| 2017-06-29 | |
| 卷号 | 77期号:7页码:12 |
| ISSN号 | 1434-6044 |
| DOI | 10.1140/epjc/s10052-017-5005-4 |
| 通讯作者 | Zhang, ming-jian(zhangmj@ihep.ac.cn) |
| 英文摘要 | In the present paper, we investigate the cosmographic problem using the bias-variance trade-off. we find that both the z-redshift and the y = z/(1 + z)-redshift can present a small bias estimation. it means that the cosmography can describe the supernova data more accurately. minimizing risk, it suggests that cosmography up to the second order is the best approximation. forecasting the constraint from future measurements, we find that future supernova and redshift drift can significantly improve the constraint, thus having the potential to solve the cosmographic problem. we also exploit the values of cosmography on the deceleration parameter and equation of state of dark energy w(z). we find that supernova cosmography cannot give stable estimations on them. however, much useful information was obtained, such as that the cosmography favors a complicated dark energy with varying w( z), and the derivative dw/dz < 0 for low redshift. the cosmography is helpful to model the dark energy. |
| WOS关键词 | DARK-ENERGY CONSTRAINTS ; EQUATION-OF-STATE ; COSMIC ACCELERATION ; LUMINOSITY DISTANCE ; SUPERNOVA ; REDSHIFT ; UNIVERSE ; DECELERATION ; STATEFINDER ; COSMOLOGY |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Particles & Fields |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000404488400003 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2177332 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Zhang, Ming-Jian |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, POB 918-3, Beijing 100049, Peoples R China 2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Ming-Jian,Li, Hong,Xia, Jun-Qing. What do we know about cosmography[J]. European physical journal c,2017,77(7):12. |
| APA | Zhang, Ming-Jian,Li, Hong,&Xia, Jun-Qing.(2017).What do we know about cosmography.European physical journal c,77(7),12. |
| MLA | Zhang, Ming-Jian,et al."What do we know about cosmography".European physical journal c 77.7(2017):12. |
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