Rotation of the CMB polarization by foreground lensing

Enea Di Dio, Ruth Durrer, Giuseppe Fanizza, and Giovanni Marozzi

Phys. Rev. D 100, 043508 – Published 5 August 2019

Abstract

We investigate the weak lensing corrections to the CMB polarization anisotropies. We concentrate on the effect of rotation and show that the rotation of polarization is a true physical effect which has to be taken into account at second order in perturbation theory. We clarify inconsistencies on the treatment of this rotation in the recent literature. We also show that at first order in perturbation theory there is no rotation of polarization also for vector and tensor modes.

Received 2 June 2019

DOI:https://doi.org/10.1103/PhysRevD.100.043508

Physics Subject Headings (PhySH)

Cosmic microwave background

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Enea Di Dio^1,2, Ruth Durrer³, Giuseppe Fanizza ⁴, and Giovanni Marozzi⁵

¹Physics Division, Lawrence Berkeley National Laboratory, Cyclotron Rd, Berkeley, California 94720, USA
²Berkeley Center for Cosmological Physics and Department of Physics, University of California, Berkeley, California 94720, USA
³Université de Genève, Département de Physique Théorique and CAP, 24 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
⁴Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy
⁵Dipartimento di Fisica, Università di Pisa, and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy

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Issue

Vol. 100, Iss. 4 — 15 August 2019

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Physical Review D

covering particles, fields, gravitation, and cosmology