Physical approach to the marginalization of LIGO calibration uncertainties
Name
PhysRevD.103.063016.pdf
Description
Published version
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Author(s)
Vitale, Salvatore
Haster, Carl-Johan
Sun, Ling
Farr, Ben
Goetz, Evan
Kissel, Jeff
Cahillane, Craig
Date Issued
2021
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Vitale, Salvatore, Haster, Carl-Johan, Sun, Ling, Farr, Ben, Goetz, Evan et al. 2021. "Physical approach to the marginalization of LIGO calibration uncertainties." Physical Review D, 103 (6).
Version
Final published version
Abstract
The data from ground based gravitational-wave detectors such as Advanced LIGO
and Virgo must be calibrated to convert the digital output of photodetectors
into a relative displacement of the test masses in the detectors, producing the
quantity of interest for inference of astrophysical gravitational wave sources.
Both statistical uncertainties and systematic errors are associated with the
calibration process, which would in turn affect the analysis of detected
sources, if not accounted for. Currently, source characterization algorithms
either entirely neglect the possibility of calibration uncertainties or account
for them in a way that does not use knowledge of the calibration process
itself. We present physiCal, a new approach to account for calibration errors
during the source characterization step, which directly uses all the
information available about the instrument calibration process. Rather than
modeling the overall detector's response function, we consider the individual
components that contribute to the response. We implement this method and apply
it to the compact binaries detected by LIGO and Virgo during the second
observation run, as well as to simulated binary neutron stars for which the sky
position and distance are known exactly. We find that the physiCal model
performs as well as the method currently used within the LIGO-Virgo
collaboration, but additionally it enables improving the measurement of
specific components of the instrument control through astrophysical
calibration.
MIT Department
LIGO (Observatory : Massachusetts Institute of Technology)
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.103.063016
