Cosmic-String Lensing Starter (Rubin-style)

This repository is a credibility pack for proposals to search for cosmic strings via their undistorted double-image lensing signature. It contains:

• A light-weight simulation that injects string-like duplicate sources into toy sky images (src/sim_string.py).
• A simple pair-finder and colinearity checker (src/pair_finder.py).
• A null-result constraint calculator that estimates an upper limit on string tension Gμ from area and completeness (src/stats_limit.py).
• A short technical memo (PDF) summarizing the approach and showing how this maps to Rubin/RSP tooling.

Quick Start

python -m venv venv && source venv/bin/activate  # Windows: py -m venv venv && venv\Scripts\activate
pip install -r requirements.txt
python src/sim_string.py --out data/samples/sim1.npy --n_gal 1200 --seed 42
python src/pair_finder.py --image data/samples/sim1.npy --out pairs.csv
python src/stats_limit.py --area_deg2 300 --completeness 0.5 --n_detected 0