Observable physical modes of modified gravity

	Observable physical modes of modified gravity
	Hojjati, Alireza 1,2; Pogosian, Levon 1; Silvestri, Alessandra 3,4,5; Zhao, Gong-Bo6,7
刊名	PHYSICAL REVIEW D
	2014-03-31
卷号	89 期号:8
英文摘要	At linear order in cosmological perturbations, departures from the growth in the cosmological standard model can be quantified in terms of two functions of redshift z and Fourier number k. Previous studies have performed principal component forecasts for several choices of these two functions based on expected capabilities of upcoming large structure surveys. It is typically found that there will be many well-constrained degrees of freedom. However, not all and probably most of these degrees of freedom were physical if the parametrization had allowed for an arbitrary k dependence. In this paper, we restrict the k dependence to that allowed in local theories of gravity under the quasistatic approximation, i.e. ratios of polynomials in k, and identify the best constrained features in the (z; k) dependence of the commonly considered functions and. as measured by a Large Synoptic Survey Telescope (LSST)-like weak lensing survey. We estimate the uncertainty in the measurements of the eigenmodes of modified growth. We find that imposing the theoretical prior on k dependence reduces the number of degrees of freedom and the covariance between parameters. On the other hand, imaging surveys like LSST are not as sensitive to the z dependence as they are to the k dependence of the modified growth functions. This trade-off provides us with, more or less, the same number of well-constrained eigenmodes (with respect to our prior) as found before, but now these modes are physical.
收录类别	SCI
语种	英语
WOS记录号	WOS:000341778400004
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6417]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada 2.Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada 3.SISSA Int Sch Adv Studies, I-34136 Trieste, Italy 4.Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy 5.INAF Osservatorio Astron Trieste, I-34131 Trieste, Italy 6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 7.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England
推荐引用方式 GB/T 7714	Hojjati, Alireza,Pogosian, Levon,Silvestri, Alessandra,et al. Observable physical modes of modified gravity[J]. PHYSICAL REVIEW D,2014,89(8).
APA	Hojjati, Alireza,Pogosian, Levon,Silvestri, Alessandra,&Zhao, Gong-Bo.(2014).Observable physical modes of modified gravity.PHYSICAL REVIEW D,89(8).
MLA	Hojjati, Alireza,et al."Observable physical modes of modified gravity".PHYSICAL REVIEW D 89.8(2014).