On signal estimation and detection in LIGO signals
| Main Author: | Akhila Raman |
|---|---|
| Format: | info publication-workingpaper Journal |
| Terbitan: |
, 2018
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/1252322 |
Daftar Isi:
- This article analyzes the data for the first three gravitational wave (GW) events detected in both Hanford (H1) and Livingston (L1) detectors by the LIGO collaboration, from the viewpoint of signal estimation and detection. It is shown that the GW channel in the LIGO detector does in fact pick up strong 60*n Hz electromagnetic interference (EMI) from power lines and hence the possibility of EMI from terrestrial and non-terrestrial sources, cannot be ruled out as a candidate for these assumed GW events. Let us consider the case where EM interference is the cause of the assumed GW signal. It will be shown that the time domain cross-correlation of magnetometer signal during GW event with the template, does not show peaks in cross-correlation, while the GW channel shows cross-correlation peaks, if the frequency response of the two channels differs or the noise spectra in the two channels differ. Hence EM interference can be mistaken for GW signals and it is suggested that GW150914, GW151226 and GW170104 be further studied independently and the consequences of these results are discussed for GW170814 and GW170817. All the results in this paper are demonstrated using modified versions of LIGO's Python scripts.