Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/51212
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Type: Journal article
Title: An upper limit on the stochastic gravitational-wave background of cosmological origin
Author: Hosken, D.
Munch, J.
Ottaway, D.
Veitch, P.
Citation: Nature, 2009; 460(7258):990-994
Publisher: Nature Publishing Group
Issue Date: 2009
ISSN: 0028-0836
1476-4687
Statement of
Responsibility: 
B. Abbott... D. J. Hosken... J. Munch... D. J. Ottaway... P. J. Veitch...et al.
Abstract: A stochastic background of gravitational waves is expected to arise from a superposition of a large number of unresolved gravitational-wave sources of astrophysical and cosmological origin. It should carry unique signatures from the earliest epochs in the evolution of the Universe, inaccessible to standard astrophysical observations. Direct measurements of the amplitude of this background are therefore of fundamental importance for understanding the evolution of the Universe when it was younger than one minute. Here we report limits on the amplitude of the stochastic gravitational-wave background using the data from a two-year science run of the Laser Interferometer Gravitational-wave Observatory (LIGO). Our result constrains the energy density of the stochastic gravitational-wave background normalized by the critical energy density of the Universe, in the frequency band around 100 Hz, to be <6.9 x 10(-6) at 95% confidence. The data rule out models of early Universe evolution with relatively large equation-of-state parameter, as well as cosmic (super)string models with relatively small string tension that are favoured in some string theory models. This search for the stochastic background improves on the indirect limits from Big Bang nucleosynthesis and cosmic microwave background at 100 Hz.
Keywords: Cosmology and Extragalactic Astrophysics (astro-ph.CO)
Rights: (c) 2009 Macmillan Publishers Limited. All rights reserved. Submitted to Cornell University's online archive www.arXiv.org in 2009 by Vuk Mandic. Post-print sourced from www.arxiv.org
RMID: 0020092200
DOI: 10.1038/nature08278
Appears in Collections:Physics publications
Environment Institute publications

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