Lighweight python stochastic gravitational-wave background analysis pipeline
Project description
pygwb
pygwb
: A python-based, user-friendly library for gravitational-wave background (GWB) searches with ground-based interferometers.
pygwb
provides a modular and flexible codebase to analyse laser interferometer data and design a GWB search pipeline. It is tailored to current ground-based interferometers: LIGO Hanford, LIGO Livingston, and Virgo, but can be generalized to other configurations. It is based on the existing packages gwpy
and bilby
, for optimal integration with widely-used GW data anylsis tools.
pygwb
also includes a set of pre-packaged analysis scripts which may be used to analyse data and perform large-scale searches on a high-performance computing cluster efficiently.
Installation instructions
-
Essentials to support
pygwb
are present in live igwn conda environments https://computing.docs.ligo.org/conda/ -
More precisely, current dependencies are
numpy
scipy>=1.8.0
matplotlib
corner
gwpy>=3.0.1
bilby>=1.4
astropy>=5.2
lalsuite>=7.3
gwdetchar
gwsumm
pycondor
loguru
json5
seaborn
Modules
The code is structured into a set of modules and objects.
detector.py
: contains theInterferometer
object. TheInterferometer
manages data reading, preprocessing, and PSD estimation.baseline.py
: contains theBaseline
object. TheBaseline
is the core manager object in the stochastic analysis.network.py
: contains theNetwork
object. TheNetwork
is used to combine results from indibidualBaselines
as well as simulating data across anInterferometer
network.preprocessing.py
: methods for initial data-conditioning steps (high-pass filter and downsampling) on data from an individual detector. Supports importing public, private, or local data.spectral.py
: methods to calculate CSDs and PSDs for sub-segments in a dataset, made of coincident time segments for a pair of detectors.postprocessing.py
: methods to combine individual segment cross-correlation spectrograms into a final spectrum, in units of fractional energy density.omega_spectra.py
: contains theOmegaSpectrum
andOmegaSpectrogram
objects.pe.py
: contains model objects to perform pe withBilby
.statistical_checks.py
: Contains theStatisticalChecks
object, and methods to run statistical checks on results from an analysis run.simulator.py
: Contains theSimulator
object, which can simulate data for a set of detectors.delta_sigma_cut.py
: Methods to perform the delta-sigma data quality cut.notch.py
: Contains theStochNotch
andStochNotchList
objects, which store information about frequency notches to be applied to the analyzed data spectra.constants.py
: contains numerical values of constants used throughout the codebase.orfs.py
: Methods to calcuate overlap reduction functions.parameters.py
: Contains theParameters
dataclass.util.py
: contains miscellaneous useful functions used throughout the codebase.
Scripts
A set of scripts are included and maintained to run every-day stochastic tasks.
pygwb_pipe
: runs the cross-correlation stochastic analysis over data from selected detector pair, within the timeframes requested.pygwb_combine
: combines over multiplepygwb_pipe
output files. Useful when running long analyses in parallel.pygwb_pe
: runs parameter estimation on desired model.pygwb_stats
: produces regular statistical checks output.pygwb_dag
: supports the creation of a dag file for condor job submission.
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