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A Python compressed low-$\ell$ Planck likelihood for temperature and polarization

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arxiv 2104.05715 v1 pith:7F45CZ4T submitted 2021-04-12 astro-ph.CO

classification astro-ph.CO
keywords planckpolarizationtemperatureangularconstrainlikelihoodlow-planck-low-py
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We present Planck-low-py, a binned low-$\ell$ temperature and E-mode polarization likelihood, as an option to facilitate ease of use of the Planck 2018 large-scale data in joint-probe analysis and forecasting. It is written in Python and compresses the $\ell<30$ temperature and polarization angular power spectra information from Planck into two log-normal bins in temperature and three in polarization. These angular scales constrain the optical depth to reionization and provide a lever arm to constrain the tilt of the primordial power spectrum. We show that cosmological constraints on $\Lambda$CDM model parameters using Planck-low-py are consistent with those derived with the full Commander and SimAll likelihoods from the Planck legacy release.

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Cited by 5 Pith papers

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