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Gravitational-Wave Cosmology across 29 Decades in Frequency

Open access
Lasky, Paul D., Mingarelli, Chiara M. F., Smith, Tristan L., Giblin, John T., Thrane, Eric, Reardon, Daniel J., Caldwell, Robert, Bailes, Matthew, Bhat, N. D. Ramesh, Burke-Spolaor, Sarah, Dai, Shi, Dempsey, James, Hobbs, George, Kerr, Matthew, Levin, Yuri, Manchester, Richard N., Osłowski, Stefan, Ravi, Vikram, Rosado, Pablo A., Shannon, Ryan M., Spiewak, Renée, van Straten, Willem, Toomey, Lawrence, Wang, Jingbo, Wen, Linqing, You, Xiaopeng, Zhu, Xingjiang·2016·Physical Review X

Abstract

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, Ω GW ðfÞ < 2.3 × 10 -10 .Observations of the cosmic microwave background alone limit the gravitational-wave spectral index at 95% confidence to n t ≲ 5 for a tensor-toscalar ratio of r ¼ 0.11.However, the combination of all the above experiments limits n t < 0.36.

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Metadata

Authors
Lasky, P. D., Mingarelli, C. M. F., Smith, T. L., Giblin, J. T., Thrane, E., Reardon, D. J., Caldwell, R., Bailes, M., Bhat, N. D. R., Burke-Spolaor, S., Dai, S., Dempsey, J., Hobbs, G., Kerr, M., Levin, Y., Manchester, R. N., Osłowski, S., Ravi, V., Rosado, P. A., Shannon, R. M., Spiewak, R., van Straten, W., Toomey, L., Wang, J., Wen, L., You, X., & Zhu, X.
Venue
Physical Review X
Published
2016-03-31
Volume
6
Issue
1
ISSN
2160-3308 (ISSN-L)
OpenAlex
W2177010673
Cited by
194
References
5
FWCI
9.77
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Gravitational-Wave Cosmology across 29 Decades in Frequency. https://app.cochat.ai/papers/10.1103/physrevx.6.011035
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Lasky, P. D., Mingarelli, C. M. F., Smith, T. L., Giblin, J. T., Thrane, E., Reardon, D. J., Caldwell, R., Bailes, M., Bhat, N. D. R., Burke-Spolaor, S., Dai, S., Dempsey, J., Hobbs, G., Kerr, M., Levin, Y., Manchester, R. N., Osłowski, S., Ravi, V., Rosado, P. A., . . . Zhu, X. (2016). Gravitational-Wave Cosmology across 29 Decades in Frequency. Physical Review X. https://doi.org/10.1103/physrevx.6.011035

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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