Author: Cherian Parangot Ittyipe Cardiff MSc Astrophysics (Merit, 2024)
Plots the CMB TT power spectrum generated by CAMB using the posterior mean parameter set from a Bayesian MCMC inference of the Early Quintessence (EDE) model against Planck 2018 bandpowers.
It does not run MCMC or perform parameter inference. For the full inference pipeline, see the companion repository:
→ cmb-ede-mcmc — emcee + CAMB inference of 10 EDE parameters against Planck 2018 TT+TE+EE
The plotted parameters (params.json) are the MCMC posterior mean from
the companion repo. Key EDE constraints from the Cardiff MSc thesis:
| Parameter | Value |
|---|---|
| 69.56 ± 0.93 km/s/Mpc | |
| 0.083 ± 0.024 | |
| 3.47 ± 0.10 | |
| 2.95 ± 0.24 |
pip install camb astropy matplotlib numpy
python plot_cmb_from_posterior.py \
--fits /path/to/COM_PowerSpect_CMB_R2.02.fits \
--params params.json- Thesis: DOI:10.5281/zenodo.17681763
- Inference pipeline: cmb-ede-mcmc
- EarlyQuintessence model: Smith, Poulin & Amin 2020 (arXiv:1908.06995)
- Planck 2018: Aghanim et al. 2020 (arXiv:1807.06209)
