PREPRINT
1D01FAFB-453E-4026-9AC6-6DF882C17134

# Planck ISW-lensing likelihood and the CMB temperature

Julien Carron, Antony Lewis, Giulio Fabbian
arXiv:2209.07395

Submitted on 15 September 2022

## Abstract

We present a new Planck CMB lensing-CMB temperature cross-correlation likelihood that can be used to constrain cosmology via the Integrated Sachs-Wolfe (ISW) effect. CMB lensing is an excellent tracer of ISW, and we use the latest PR4 Planck data maps and lensing reconstruction to produce the first public Planck likelihood to constrain this signal. We demonstrate the likelihood by constraining the CMB background temperature from Planck data alone, where the ISW-lensing cross-correlation is a powerful way to break the geometric degeneracy, substantially improving constraints from the CMB and lensing power spectra alone.

## Preprint

Comment: 9 pages, 10 figures

Subject: Astrophysics - Cosmology and Nongalactic Astrophysics