Scrutinizing Early Dark Energy models through CMB lensing

Abstract

We investigate early dark energy models in the context of the lensing anomaly by considering two different Cosmic Microwave Background (CMB) datasets: a complete Planck, and a second one primarily based on SPTPol and Planck temperature ($l<1000$). We contrast the effects of allowing the phenomenological lensing amplitude ($\Al$) to be different from unity. We find that the fraction of early dark energy, while not immediately affected by the lensing anomaly, can induce mild deviations, through correlations with the parameters $H_0$ and $S_8$. {We extend the analysis also by marginalizing the Newtonian lensing potential, finding a $\gtrsim 1\ddot{I}ƒ$ deviation, when allowing for an amplitude rescaling and scale-dependence. Modeling the rescaling of the theory lensing potential and the acoustic smoothing of the CMB spectra, we find that only to a moderate level the anomaly can be addressed by modifying the lensing signal itself and that an additional $\Al \sim 1.1$ at $\sim 2\ddot{I}ƒ$ significance should be addressed by pre-recombination physics. Finally, we also comment on the lensing anomaly in a non-flat ($\hat{I}{\text{c◯}}_{\mathrm{k}}\ne 0$) scenario, finding that the late-time flatness of the universe is robust and not correlated with the additional smoothing in the CMB spectra.

Comments are welcome