This is a modified version of CAMB (https://github.com/cmbant/CAMB) implementing the Early Dark Fluid (EDF) model (https://arxiv.org/abs/2410.16185).
See main CAMB repository for installation.
The EDF model consists in the addition of 6 parameters to the standard LCDM model:
- 4 parameters for the amplitudes of the density modes.
- 2 sound speed parameters.
Those parameters can be used when calling the set_params function from CAMB by adding the following fields:
- amp_delta : list of four amplitudes
- cs2_1 :
$c_1^2$ - cs2_2 :
$c_2^2$
Note this implementation assumes LCDM for the late-time expansion of the Universe.
- If you use this code, please reference:
- Flexible parameterization to test early physics solutions to the Hubble tension with future CMB data: https://arxiv.org/abs/2410.16185
- Efficient Computation of Cosmic Microwave Background Anisotropies in Closed Friedmann-Robertson-Walker Models: https://arxiv.org/abs/astro-ph/9911177
- CMB power spectrum parameter degeneracies in the era of precision cosmology: https://arxiv.org/abs/1201.3654