CosmoBLENDER

Cosmological Biases to LENsing and Delensing Due to Extragalactic Radiation

CosmoBLENDER is a python code that computes biases to CMB lensing auto- and cross-correlations, as well as internal delensing. It follows Baleato Lizancos et al. 2025.

Installation

Dependencies:

• NumPy, SciPy, Matplotlib
• BasicILC from this fork
• Hmvec from its galaxy branch for CIB calculations
• Quicklens (Python 3 version)
• astropy
• pyccl (optional, needed for FFTlog-based calculation; we recommend using the default Gaussian quadratures instead).

Editable installation in-place:

First, clone the repository

git clone https://github.com/abaleato/CosmoBLENDER.git

and from within it run

python -m pip install -e .

Usage

See the notebooks under the examples/ directory -- examples/example_pipeline.ipynb is a great place to start.

Attribution

If you use the code, please cite Baleato Lizancos et al. 2025.