%0 Generic %1 addison2023revisiting %A Addison, Graeme E. %A Bennett, Charles L. %A Halpern, Mark %A Hinshaw, Gary %A Weiland, Janet L. %D 2023 %K tifr %T Revisiting the $A_L$ Lensing Anomaly in Planck 2018 Temperature Data %U http://arxiv.org/abs/2310.03127 %X We revisit the lensing anomaly in the Planck 2018 temperature (TT) data and examine its robustness to frequency selection and additional sky masking. Our main findings are: (1) The phenomenological lensing amplitude parameter, $A_L$, varies with ecliptic latitude, with a $2.9\sigma$ preference for $A_L>1$ near the ecliptic, and $1.0\sigma$ preference near the ecliptic poles, compared to $2.5\sigma$ on the original masks. This behavior is largely or solely from 217 GHz and suggestive of some non-random effect given the Planck scan strategy. (2) The 217 GHz TT data also show a stronger preference for $A_L>1$ than the lower frequencies. The shifts in $A_L$ from 217 GHz with additional Galactic dust masking are too large to be explained solely by statistical fluctuations, indicating some connection with the foreground treatment. Overall, the Planck $A_L$ anomaly does not have a single simple cause. Removing the 217 GHz TT data leaves a $1.8\sigma$ preference for $A_L>1$. The low-multipole ($\ell<30$) TT data contribute to the preference for $A_L>1$ through correlations with $Łambda$CDM parameters. The 100 and 143 GHz data at $\ell\geq30$ prefer $A_L>1$ at $1.3\sigma$, and this appears robust to the masking tests we performed. The lensing anomaly may impact fits to alternative cosmological models. Marginalizing over $A_L$, optionally applied only to Planck TT spectra, can check this. Models proposed to address cosmological tensions should be robust to removal of the Planck 217 GHz TT data.

@misc{addison2023revisiting, abstract = {We revisit the lensing anomaly in the Planck 2018 temperature (TT) data and examine its robustness to frequency selection and additional sky masking. Our main findings are: (1) The phenomenological lensing amplitude parameter, $A_L$, varies with ecliptic latitude, with a $2.9\sigma$ preference for $A_L>1$ near the ecliptic, and $1.0\sigma$ preference near the ecliptic poles, compared to $2.5\sigma$ on the original masks. This behavior is largely or solely from 217 GHz and suggestive of some non-random effect given the Planck scan strategy. (2) The 217 GHz TT data also show a stronger preference for $A_L>1$ than the lower frequencies. The shifts in $A_L$ from 217 GHz with additional Galactic dust masking are too large to be explained solely by statistical fluctuations, indicating some connection with the foreground treatment. Overall, the Planck $A_L$ anomaly does not have a single simple cause. Removing the 217 GHz TT data leaves a $1.8\sigma$ preference for $A_L>1$. The low-multipole ($\ell<30$) TT data contribute to the preference for $A_L>1$ through correlations with $\Lambda$CDM parameters. The 100 and 143 GHz data at $\ell\geq30$ prefer $A_L>1$ at $1.3\sigma$, and this appears robust to the masking tests we performed. The lensing anomaly may impact fits to alternative cosmological models. Marginalizing over $A_L$, optionally applied only to Planck TT spectra, can check this. Models proposed to address cosmological tensions should be robust to removal of the Planck 217 GHz TT data.}, added-at = {2023-10-06T07:03:42.000+0200}, author = {Addison, Graeme E. and Bennett, Charles L. and Halpern, Mark and Hinshaw, Gary and Weiland, Janet L.}, biburl = {https://www.bibsonomy.org/bibtex/2ad54cd9612c039614d2836591e9a6522/citekhatri}, description = {[2310.03127] Revisiting the $A_L$ Lensing Anomaly in Planck 2018 Temperature Data}, interhash = {ddb76853fce16e24510f42d50567dd51}, intrahash = {ad54cd9612c039614d2836591e9a6522}, keywords = {tifr}, note = {cite arxiv:2310.03127Comment: 27 pages, 10 figures, submitted to ApJ}, timestamp = {2023-10-06T07:03:42.000+0200}, title = {Revisiting the $A_L$ Lensing Anomaly in Planck 2018 Temperature Data}, url = {http://arxiv.org/abs/2310.03127}, year = 2023 }