CMBComp provides 3-4 parameter compressed CMB likelihoods that reproduce full posterior constraints to high precision when combined with DESI BAO data across LambdaCDM extensions.
Model-independent cosmological constraints from the CMB
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abstract
We analyse CMB data in a manner which is as model-independent as possible. We encode the effects of late-time cosmology into a single parameter which determines the distance to the last scattering surface. We exclude low multipoles $\ell<40$ from the analysis. We consider the WMAP5 and ACBAR data. We obtain the cosmological parameters $100\omega_b =2.13\pm 0.05$, $\omega_c=0.124\pm 0.007$, $n_s=0.93\pm 0.02$ and $\theta_A=0.593\pm 0.001$ degrees (68% C.L.). The last number is the angular scale subtended by the sound horizon at decoupling. There is a systematic shift in the parameters as more low $\ell$ data is omitted, towards smaller values of $\omega_b$ and $n_s$ and larger values of $\omega_c$. The scale $\theta_A$ remains stable and very well determined.
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Bin-wise uncorrelated reconstruction from DESI/SDSS BAO and Pantheon+/Union3.1/DES-Dovekie supernovae yields dark energy density peaking then declining and equation of state oscillating with phantom crossing near z~0.7, consistent across datasets at moderate significance.
A review summarizing the Hubble tension as a persistent crisis and discussing resolutions via interacting dark energy models that combine early-time and late-time modifications.
citing papers explorer
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CMBComp: A Simple and Accurate Compressed CMB Likelihood for Dark Energy, Curvature, and Massive Neutrinos
CMBComp provides 3-4 parameter compressed CMB likelihoods that reproduce full posterior constraints to high precision when combined with DESI BAO data across LambdaCDM extensions.
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Reconstructing dark energy with fewer assumptions
Bin-wise uncorrelated reconstruction from DESI/SDSS BAO and Pantheon+/Union3.1/DES-Dovekie supernovae yields dark energy density peaking then declining and equation of state oscillating with phantom crossing near z~0.7, consistent across datasets at moderate significance.
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The Hubble tension: A decade review
A review summarizing the Hubble tension as a persistent crisis and discussing resolutions via interacting dark energy models that combine early-time and late-time modifications.
- Crosschecking Cosmic Distances from DESI BAO and DES SNe