 | F. Couchot, S. Henrot-Versille, O. Perdereau, S.Plaszczynski, B. Rouille d'Orfeuil, M. Spinelli, M. Tristram |
Cosmological Parameter Estimation Comparison between Class V1.6 and Class V2.0.3
We have re-run the profile likelihoods for the Cosmological parameter estimation
with the new class version in order to compare both version of the Boltzmann solver.
Scenario: Planck+WP+highL
Results for the 6 parameter Lambda_CDM are shown in the above table/plots:
| Param | Class V1.6 | Class V2.0.3 |
| H0 | 67.2 ^{+ 1.2}_{ - 1.2} | 67.3 ^{+ 1.2}_{ - 1.2} |
| Ocdm h^2 | 0.1201 ^{+ 0.0026}_{- 0.0026} | 0.1200 ^{+ 0.0026}_{- 0.0026} |
| Omb h^2 | 0.02208 ^{+ 0.00027}_{- 0.00027} | 0.02210 ^{+ 0.00027}_{- 0.00027} |
| Ns | 0.9575 ^{+ 0.0071}_{- 0.0071} | 0.9577 ^{+ 0.0071}_{- 0.0070} |
| log[10^{10}A_s] | 3.087 ^{+ 0.025}_{ - 0.024} | 3.088 ^{+ 0.025}_{ - 0.024} |
| Zre | 11.0 ^{+ 1.1}_{ - 1.1} | 11.1 ^{+ 1.1}_{ - 1.1} |
| Chi2min | 10508.9 | 10508.7 |
The corresponding plots are shown below, the color code is as follows:
in Red Class V1.6 and in Green Class V2.0.3
Results when fitting Lambda_CDM + the neutrino mass
We profile the neutrino mass and fit for the 6 Lambda_CDM Cosmological parameters. The
limit on sum of the neutrino masses is given at 95%CL, derived using Feldman Cousins
prescription, and is given in eV.
| data set | Upper 95%CL limit V1.6 | Upper 95%CL limit V2.0.3 |
| CMB+Lensing | 0.88 | 0.81 |
| CMB+Lensing+BAO | 0.26 | 0.26 |
The corresponding profile is shown below, where the light colors correspond
to the new Class V2.0.3 points.
Conclusion on the study:
- The fit is more stable (we do manage to obtain the convergence for the profiles more often)
- The min chi2 is a little smaller with the new Class version
- The mean values and the errors on the Cosmological parameters are very compatible between both class versions.
