Binary Neutron Star Simulation with Einstein Toolkit and Lorene

Overview

This repository presents the key files and final results of a binary neutron star (BNS) simulation project based on Einstein Toolkit and Lorene. The project was completed as part of a numerical relativity selection task, with emphasis on simulation setup, waveform extraction, visualization and result organization.

The repository includes:

• the main simulation parameter file
• extracted waveform data for the target gravitational-wave modes
• a Python post-processing script
• final waveform figures
• representative simulation logs
• an evolution video

Project Objective

The objective of this project is to:

• compile and use Einstein Toolkit and Lorene
• construct an equal-mass binary neutron star system
• set the component masses to 1.2 + 1.2 solar masses
• use an initial separation of 45 km
• adopt a polytropic equation of state
• evolve the system dynamically
• extract gravitational-wave signals in the following modes:
  • ( l = 2, m = 0 )
  • ( l = 2, m = 2 )
• produce waveform plots and an evolution video

Repository Structure

.
├── README.md
├── data/
│   ├── processed/
│   │   ├── l2_m0_psi4.txt
│   │   └── l2_m2_psi4.txt
│   └── waveforms/
│       ├── psi4_l2_m0_r100.asc
│       └── psi4_l2_m2_r100.asc
├── figures/
│   ├── psi4_comparison.png
│   ├── psi4_l2_m0.png
│   └── psi4_l2_m2.png
├── logs/
│   ├── run_bns45_mpi16.err
│   └── run_bns45_mpi16.out
├── media/
│   └── bns_evolution.mp4
├── params/
│   └── bns_45km.par
└── scripts/
    └── plot_psi4.py