Gravitational-Wave Cosmology across 29 Decades in Frequency

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 脉冲星研究团组

	Gravitational-Wave Cosmology across 29 Decades in Frequency
	Lasky, Paul D.1; Mingarelli, Chiara M. F.2,3; Smith, Tristan L.4; Giblin, John T., Jr.5,6,7; Thrane, Eric 1; Reardon, Daniel J.1; Caldwell, Robert 8; Bailes, Matthew 9; Bhat, N. D. Ramesh 10; Burke-Spolaor, Sarah 11
刊名	PHYSICAL REVIEW X
	2016-03-31
卷号	6 期号:1
ISSN号	2160-3308
英文摘要	Quantum fluctuations of the gravitational field in the early Universe, amplified by inflation, produce a primordial gravitational-wave background across a broad frequency band. We derive constraints on the spectrum of this gravitational radiation, and hence on theories of the early Universe, by combining experiments that cover 29 orders of magnitude in frequency. These include Planck observations of cosmic microwave background temperature and polarization power spectra and lensing, together with baryon acoustic oscillations and big bang nucleosynthesis measurements, as well as new pulsar timing array and ground-based interferometer limits. While individual experiments constrain the gravitational-wave energy density in specific frequency bands, the combination of experiments allows us to constrain cosmological parameters, including the inflationary spectral index n(t) and the tensor-to-scalar ratio r. Results from individual experiments include the most stringent nanohertz limit of the primordial background to date from the Parkes Pulsar Timing Array, Omega(GW)(f) < 2.3 x 10(-10). Observations of the cosmic microwave background alone limit the gravitational-wave spectral index at 95% confidence to n(t) less than or similar to 5 for a tensor-to-scalar ratio of r = 0.11. However, the combination of all the above experiments limits n(t) < 0.36. Future Advanced LIGO observations are expected to further constrain n(t) < 0.34 by 2020. When cosmic microwave background experiments detect a nonzero r, our results will imply even more stringent constraints on nt and, hence, theories of the early Universe.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	MICROWAVE BACKGROUND ANISOTROPIES ; GRAVITY-WAVES ; PERTURBATIONS ; POLARIZATION ; MODELS ; UNIVERSE ; PROBE
收录类别	SCI
语种	英语
WOS记录号	WOS:000373099800001
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/1388]
专题	脉冲星研究团组新疆天文台_射电天文研究室
作者单位	1.Monash Univ, Monash Ctr Astrophys, Sch Phys & Astron, Clayton, Vic 3800, Australia 2.CALTECH, TAPIR Grp, MC 350-17, Pasadena, CA 91125 USA 3.Max Planck Inst Radio Astron, Hugel 69, D-53121 Bonn, Germany 4.Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA 5.Kenyon Coll, Dept Phys, Gambier, OH 43022 USA 6.Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA 7.Case Western Reserve Univ, CERCA, Cleveland, OH 44106 USA 8.Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA 9.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia 10.Curtin Univ Technol, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia
推荐引用方式 GB/T 7714	Lasky, Paul D.,Mingarelli, Chiara M. F.,Smith, Tristan L.,et al. Gravitational-Wave Cosmology across 29 Decades in Frequency[J]. PHYSICAL REVIEW X,2016,6(1).
APA	Lasky, Paul D..,Mingarelli, Chiara M. F..,Smith, Tristan L..,Giblin, John T., Jr..,Thrane, Eric.,...&Zhu, Xingjiang.(2016).Gravitational-Wave Cosmology across 29 Decades in Frequency.PHYSICAL REVIEW X,6(1).
MLA	Lasky, Paul D.,et al."Gravitational-Wave Cosmology across 29 Decades in Frequency".PHYSICAL REVIEW X 6.1(2016).