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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, Eric1; Reardon, Daniel J.1; Caldwell, Robert8; Bailes, Matthew9; Bhat, N. D. Ramesh10; Burke-Spolaor, Sarah11; Dai, Shi12,13,14; Dempsey, James15; Hobbs, George12; Kerr, Matthew12; Levin, Yuri1; Manchester, Richard N.12; Oslowski, Stefan3,16; Ravi, Vikram17; Rosado, Pablo A.9; Shannon, Ryan M.10,12; Spiewak, Renee18; van Straten, Willem9; Toomey, Lawrence12; Wang, Jingbo19; Wen, Linqing20; You, Xiaopeng21; Zhu, Xingjiang20
Source PublicationPHYSICAL REVIEW X
Contribution Rank19

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.

Correspondent Emailpaul.lasky@monash.edu
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS KeywordMicrowave Background Anisotropies ; Gravity-waves ; Perturbations ; Polarization ; Models ; Universe ; Probe
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000373099800001
Funding OrganizationNational Science Foundation(PHY-1066293 ; Marie Curie International Outgoing Fellowship within the European Union Seventh Framework Programme ; DOE(DE-SC0010386) ; Commonwealth of Australia ; ARC(FT110100384 ; Alexander von Humboldt Foundation ; NSFC(11403086 ; West Light Foundation of CAS(XBBS201322) ; FRFCU Project(XDJK2015B012) ; China Scholarship Council (CSC) ; PHY-1414479) ; FT120100595 ; U1231120) ; DP140102578 ; FT150100281)
Citation statistics
Cited Times:60[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLasky, Paul D.
Affiliation1.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
11.Natl Radio Astron Observ, Array Operat Ctr, POB O, Soccoro, NM 87801 USA
12.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
13.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
14.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
15.CSIRO Informat Management & Technol, POB 225, Dickson, ACT 2602, Australia
16.Univ Bielefeld, Fak Phys, Postfach 100131, D-33501 Bielefeld, Germany
17.CALTECH, Cahill Ctr Astron & Astrophys, MC 249-17, Pasadena, CA 91125 USA
18.Univ Wisconsin, Dept Phys, POB 413, Milwaukee, WI 53201 USA
19.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
20.Univ Western Australia, Sch Phys, Crawley, WA 6009, Australia
21.Southwest Univ, Sch Phys Sci & Technol, Chongqing 400715, Peoples R China
Recommended Citation
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):011035.
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),011035.
MLA Lasky, Paul D.,et al."Gravitational-Wave Cosmology across 29 Decades in Frequency".PHYSICAL REVIEW X 6.1(2016):011035.
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