Search for the isotropic stochastic background using data from Advanced LIGO's second observing run

Abbott, B. P. and Angelova, S. V. and Birney, R. and Lockerbie, N. A. and Macfoy, S. and Reid, S., LIGO Scientific Collaboration, Virgo Collaboration (2019) Search for the isotropic stochastic background using data from Advanced LIGO's second observing run. Physical Review D, 100 (6). 061101(R). ISSN 1550-2368 (https://doi.org/10.1103/PhysRevD.100.061101)

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Abstract

The stochastic gravitational-wave background is a superposition of sources that are either too weak or too numerous to detect individually. In this study, we present the results from a cross-correlation analysis on data from Advanced LIGO's second observing run (O2), which we combine with the results of the first observing run (O1). We do not find evidence for a stochastic background, so we place upper limits on the normalized energy density in gravitational waves at the 95% credible level of ωGW<6.0×10-8 for a frequency-independent (flat) background and ωGW<4.8×10-8 at 25 Hz for a background of compact binary coalescences. The upper limit improves over the O1 result by a factor of 2.8. Additionally, we place upper limits on the energy density in an isotropic background of scalar- and vector-polarized gravitational waves, and we discuss the implication of these results for models of compact binaries and cosmic string backgrounds. Finally, we present a conservative estimate of the correlated broadband noise due to the magnetic Schumann resonances in O2, based on magnetometer measurements at both the LIGO Hanford and LIGO Livingston observatories. We find that correlated noise is well below the O2 sensitivity.

  • Item type:Article
    ID code:70358
    Dates:
    Date
    Event
    15 September 2019
    Published
    4 September 2019
    Published Online
    4 September 2019
    Accepted
    Notes:This research article is multi-authored. Please consult the manuscript for full attribution details.
    Subjects:Science > Physics
    Department:Faculty of Engineering > Biomedical Engineering
    Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:30 Oct 2019 14:05
    Last modified:09 Apr 2024 00:58
    URI:https://strathprints.strath.ac.uk/id/eprint/70358
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