Improved Upper Limits on the Stochastic Gravitational-Wave Background from 2009-2010 LIGO and Virgo Data

Abstract

Gravitational waves from a variety of sources are predicted to superpose to create a stochastic background. This background is expected to contain unique information from throughout the history of the universe that is unavailable through standard electromagnetic observations, making its study of fundamental importance to understanding the evolution of the universe. We carry out a search for the stochastic background with the latest data from LIGO and Virgo. Consistent with predictions from most stochastic gravitational-wave background models, the data display no evidence of a stochastic gravitational-wave signal. Assuming a gravitational-wave spectrum of Omega_GW(f)=Omega_alpha*(f/f_ref)^alpha, we place 95% confidence level upper limits on the energy density of the background in each of four frequency bands spanning 41.5-1726 Hz. In the frequency band of 41.5-169.25 Hz for a spectral index of alpha=0, we constrain the energy density of the stochastic background to be Omega_GW(f)<5.6x10^-6. For the 600-1000 Hz band, Omega_GW(f)<0.14*(f/900 Hz)^3, a factor of 2.5 lower than the best previously reported upper limits. We find Omega_GW(f)<1.8x10^-4 using a spectral index of zero for 170-600 Hz and Omega_GW(f)<1.0*(f/1300 Hz)^3 for 1000-1726 Hz, bands in which no previous direct limits have been placed. The limits in these four bands are the lowest direct measurements to date on the stochastic background. We discuss the implications of these results in light of the recent claim by the BICEP2 experiment of the possible evidence for inflationary gravitational waves.

11 pages, 2 figures, 1 table

References in corpus (11)

• LIGO: The Laser Interferometer Gravitational-Wave Observatory
• Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
• Gravitational wave stochastic background from cosmic (super)strings
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• Gravitational Wave Production At The End Of Inflation
• Relating gravitational wave constraints from primordial nucleosynthesis, pulsar timing, laser interferometers, and the CMB: implications for the early universe
• A joint analysis of Planck and BICEP2 B modes including dust polarization uncertainty
• Gravitational Waves from the First Stars
• Gravitational wave background from rotating neutron stars
• Stochastic Gravitational Wave Background from Neutron Star r-mode Instability Revisited
• Observational upper limits on the gravitational wave production of core collapse supernovae

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