Probing Lorentz-violating electrodynamics with CMB polarization

Caloni, Luca; Giardiello, S.; Lembo, Margherita; Gerbino, Martina; Gubitosi, Giulia; Lattanzi, M.; Pagano, L.

doi:10.1088/1475-7516/2023/03/018

Cited by 10 publications

(2 citation statements)

References 93 publications

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“…A possible circular polarization background has been predicted by multiple theories, e.g., Lorentz violating physics (Alexander et al 2009;Caloni et al 2023) and Faraday conversion (De & Tashiro 2015), among others. The unique capacity for CLASS to measure circular polarization allows us to search for such a signal.…”

Section: Circular Polarization Limitsmentioning

confidence: 99%

CLASS Angular Power Spectra and Map-component Analysis for 40 GHz Observations through 2022

Eimer,

Li 李,

Brewer

et al. 2024

ApJ

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Measurement of the largest angular scale (ℓ < 30) features of the cosmic microwave background (CMB) polarization is a powerful way to constrain the optical depth to reionization and search for the signature of inflation through the detection of primordial B-modes. We present an analysis of maps covering 73.6% of the sky made from the 40 GHz channel of the Cosmology Large Angular Scale Surveyor (CLASS) from 2016 August to 2022 May. Taking advantage of the measurement stability enabled by front-end polarization modulation and excellent conditions from the Atacama Desert, we show this channel achieves higher sensitivity than the analogous frequencies from satellite measurements in the range 10 < ℓ < 100. Simulations show the CLASS linear (circular) polarization maps have a white noise level of 125 ( 130 ) μ K arcmin . We measure the Galaxy-masked EE and BB spectra of diffuse synchrotron radiation and compare to space-based measurements at similar frequencies. In combination with external data, we expand measurements of the spatial variations of the synchrotron spectral energy density (SED) to include new sky regions and measure the diffuse SED in the harmonic domain. We place a new upper limit on a background of circular polarization in the range 5 < ℓ < 125 with the first bin showing D ℓ < 0.023 μ K CMB 2 at 95% confidence. These results establish a new standard for recovery of the largest-scale CMB polarization from the ground and signal exciting possibilities when the higher sensitivity and higher-frequency CLASS channels are included in the analysis.

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Section: Circular Polarization Limitsmentioning

confidence: 99%

CLASS Angular Power Spectra and Map-component Analysis for 40 GHz Observations through 2022

Eimer,

Li 李,

Brewer

et al. 2024

ApJ

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“…Observing CMB photons gives the opportunity to test fundamental physics, and in particular modifications of the electromagnetic theory [1,2]. A well known extension of the standard formulation is obtained by adding an extra-term in the Maxwell Lagrangian density which encodes a Chern-Simons interaction between photons and a new scalar field χ [3]:…”

Section: Jcap05(2023)026mentioning

confidence: 99%

Probing axions through tomography of anisotropic cosmic birefringence

Greco

Bartolo

Gruppuso

2023

J. Cosmol. Astropart. Phys.

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Cosmic birefringence is the in-vacuo rotation of the linear polarization plane experienced by photons of the Cosmic Microwave Background (CMB) radiation when theoretically well-motivated parity-violating extensions of Maxwell electromagnetism are considered. If the angle parametrizing such a rotation is dependent on the photon's direction, then this phenomenon is called Anisotropic Cosmic Birefringence (ACB). In this paper, we perform for the first time a tomographic treatment of the ACB, by considering photons emitted both at the recombination and reionization epoch. This allows one to extract additional and complementary information about the physical source of cosmic birefringence with respect to the isotropic case. We focus here on the case of an axion-like field χ, whose coupling with the electromagnetic sector induces such a phenomenon, by using an analytical and numerical approach (which involves a modification of the CLASS code). We find that the anisotropic component of cosmic birefringence exhibits a peculiar behavior: an increase of the axion mass implies an enhancement of the anisotropic amplitude, allowing to probe a wider range of masses with respect to the purely isotropic case. Moreover, we show that at large angular scales, the interplay between the reionization and recombination contributions to ACB is sensitive to the axion mass, so that at sufficiently low multipoles, for sufficiently light masses, the reionization contribution overtakes the recombination one, making the tomographic approach to cosmic birefringence a promising tool for investigating the properties of this axion-like field.

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Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Desai

2024

Recent Progress on Gravity Tests

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Probing Lorentz-violating electrodynamics with CMB polarization

Cited by 10 publications

References 93 publications

CLASS Angular Power Spectra and Map-component Analysis for 40 GHz Observations through 2022

CLASS Angular Power Spectra and Map-component Analysis for 40 GHz Observations through 2022

Probing axions through tomography of anisotropic cosmic birefringence

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

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