A_planck nuisance parameter and the Planck lensing likelihood
Posted: April 27 2022
Hello,
I have been combining the Planck lensing likelihood with other (non CMB) likelihoods and realized that the prior on A_planck can have a significant impact on the values of the scalar amplitude (A_s) that are probed. Reading through the Planck documentation, the statement that A_planck should have a Gaussian prior with mean 1 and standard deviation 0.0025 appears in many places.
Is this prior still justified when using the Planck lensing likelihood without other CMB power spectra data? If not, what would be an appropriate prior?
Best,
Tristan
I have been combining the Planck lensing likelihood with other (non CMB) likelihoods and realized that the prior on A_planck can have a significant impact on the values of the scalar amplitude (A_s) that are probed. Reading through the Planck documentation, the statement that A_planck should have a Gaussian prior with mean 1 and standard deviation 0.0025 appears in many places.
Is this prior still justified when using the Planck lensing likelihood without other CMB power spectra data? If not, what would be an appropriate prior?
Best,
Tristan