GWXtreme Documentation

GWXtreme [1] [2] is a package providing efficient algorithms to conduct approximate Bayesian inference of the neutron star equation of state from both gravitational wave detections of binary neutron star or neutron star-black hole mergers and simultaneous mass-radius measurements of pulsars. Currently available tools include:

1. Model selection of the neutron star equation of state. Models can be specified as:

• named, tabulated models available in LALSuite (such as APR4_EPP, SLY)

• mass, tidal deformability data files

• mass, radius, tidal Love number data files

2. Parameter estimation of parameterized equation of state models. Available parameterized models include:

• 4-parameter spectral decomposition

• 4-parameter piecewise polytrope

Model selection is useful for quickly comparing proposed equation of state models, while parameterized inference can provide direct constraints on the pressure-density relation of cold nuclear matter. The below figures illustrate the types of results that can be produced using these two inference capabilities of GWXtreme.

Getting Started

• Installation and Data
  • Installation
  • Compact Binary Coalescence (LIGO GW event) Parameter Estimation Data
  • Pulsar Mass-Radius (NICER observation) Data
• Inference Methods
• Examples
  • EOS Model Selection
    • Single-Event Inference
    • Multi-Event Joint Inference
    • Mult-Messenger Joint Inference
    • Model Selection with a Set of Equations
  • Parameterized EOS Inference

API Reference

• gwxtreme.eos_inference
• gwxtreme.eos_interpolator
• gwxtreme.eos_prior
• gwxtreme.density_estimation
• gwxtreme.utils
• gwxtreme.usage_scripts