text: 376,133,1356420877114572802,1092114266952531968,Graeme Addison,"My new paper looking at Hubble constant constraints from CMB E-mode data sets: <LINK> Recently, the @SPTelescope paper Dutcher+ showed that Planck, ACTPol, SPTpol & SPT-3G all get higher H0 in EE than the Planck TT LCDM constraint (see their Fig 13). [1/6] <LINK> What happens if we *combine* the different EE spectra? Does this reinforce the preference for a higher H0? If yes, perhaps it could be some clue that to resolve the Hubble tension we want a model that departs from LCDM more strongly in temperature than polarization. [2/6] I ran the fit… and found that combining Planck EE + ACTPol EE + SPTpol EE actually gives 68.7 +/- 1.3 km/s/Mpc, 2.4 sigma lower than the latest SH0ES distance ladder (73.2 +/- 1.3). So how can you combine three values that are all &gt;=70 and get 68.7? [3/6] The answer lies in the different degeneracy directions across the full LCDM param space (look at n_s vs Obh2), related to sensitivity to different multipole ranges. To reach a consensus on Obh2 between Planck and ACTPol/SPTpol you end up shifting lower in H0, n_s. [4/6] <LINK> Are the constraints from different EE data sets consistent with one another? Yes - difference at most 1.4 sigma across the LCDM space (see Table 2). Also consistent with Planck TT LCDM at 0.8 sigma. [5/6] <LINK> NB - The SPT-3G likelihood isn’t public yet, but since the degeneracy directions are going to be pretty similar between SPTpol and SPT-3G EE I expect that combining Planck EE + SPT-3G EE will similarly lead to a lower H0 / lower n_s. [6/6]",https://arxiv.org/abs/2102.00028,"The E-mode (EE) CMB power spectra measured by Planck, ACTPol, and SPTpol constrain the Hubble constant to be $70.0\pm2.7$, $72.4^{+3.9}_{-4.8}$, and $73.1^{+3.3}_{-3.9}$ km s$^{-1}$ Mpc$^{-1}$ within the standard $\Lambda$CDM model (posterior mean and central 68% interval bounds). These values are higher than the constraints from the Planck temperature (TT) power spectrum, and consistent with the Cepheid-supernova distance ladder measurement $H_0=73.2\pm1.3$ km s$^{-1}$ Mpc$^{-1}$. If this preference for a higher value was strengthened in a joint analysis it could provide an intriguing hint at the resolution of the Hubble disagreement. We show, however, that combining the Planck, ACTPol, and SPTpol EE likelihoods yields $H_0=68.7\pm1.3$ km s$^{-1}$ Mpc$^{-1}$, $2.4\sigma$ lower than the distance ladder measurement. This is due to different degeneracy directions across the full parameter space, particularly involving the baryon density, $\Omega_bh^2$, and scalar tilt, $n_s$, arising from sensitivity to different multipole ranges. We show that the E-mode $\Lambda$CDM constraints are consistent across the different experiments within $1.4\sigma$, and with the Planck TT results at $0.8\sigma$. Combining the Planck, ACTPol, and SPTpol EE data constrains the phenomenological lensing amplitude, $A_L=0.89\pm0.10$, consistent with the expected value of unity. ","High $H_0$ Values from CMB E-mode Data: A Clue for Resolving the Hubble