Simultaneous determination of the cosmic birefringence and miscalibrated polarization angles II: Including cross-frequency spectra

Minami, Y.; Komatsu, Eiichiro

doi:10.1093/ptep/ptaa130

Cited by 43 publications

(54 citation statements)

References 26 publications

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“…The method was developed originally in Ref. [25] for autofrequency power spectra measured over the full sky, and has been extended to include a partial sky coverage [26] and cross-frequency spectra [27]. The idea is simple: while α ν rotates linear polarization of both the CMB and Galactic foreground emission, β rotates only the CMB.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…We estimate one global cosmic birefringence angle, β, and independent miscalibration angles, α ν , at four frequencies. When the intrinsic EB power spectra of the CMB at LSS and the Galactic foregrounds vanish, we can relate the observed power spectra and the best-fitting ΛCDM CMB power spectra [33] at each as [27] A C o − B C CMB,th = 0,…”

Section: Estimation Of α and βmentioning

confidence: 99%

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New Extraction of the Cosmic Birefringence from the Planck 2018 Polarization Data

2020

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We search for evidence of parity-violating physics in the Planck 2018 polarization data, and report on a new measurement of the cosmic birefringence angle, β. The previous measurements are limited by the systematic uncertainty in the absolute polarization angles of the Planck detectors. We mitigate this systematic uncertainty completely by simultaneously determining β and the angle miscalibration using the observed cross-correlation of the E-and B-mode polarization of the cosmic microwave background and the Galactic foreground emission. We show that the systematic errors are effectively mitigated and achieve a factor-of-2 smaller uncertainty than the previous measurement, finding β = 0.35 ± 0.14 deg (68% C.L.), which excludes β = 0 at 99.2% C.L. This corresponds to the statistical significance of 2.4σ.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Estimation Of α and βmentioning

confidence: 99%

New Extraction of the Cosmic Birefringence from the Planck 2018 Polarization Data

2020

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“…Applying the methodology developed in Refs. [124][125][126] to the Planck high-freuqency instrument (HFI) data at ν = 100, 143, 217 and 353 GHz released in 2018 127 , a weak signal of β = 0.35 • ± 0.14 • was reported for nearly full-sky data 31 . Throughout this section, we quote uncertainties at the 68 % C.L.…”

Section: Results From the Planck Polarisation Datamentioning

confidence: 99%

New physics from the polarised light of the cosmic microwave background

Komatsu

2022

Preprint

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Cosmology requires new physics beyond the Standard Model of elementary particles and fields. What is the fundamental physics behind dark matter and dark energy? What generated the initial fluctuations in the early Universe? Polarised light of the cosmic microwave background (CMB) may hold the key to answers. In this article, we discuss two new developments in this research area. First, if the physics behind dark matter and dark energy violates parity symmetry, their coupling to photons rotates the plane of linear polarisation as the CMB photons travel more than 13 billion years. This effect is known as 'cosmic birefringence': space filled with dark matter and dark energy behaves as if it were a birefringent material, like a crystal. A tantalising hint for such a signal has been found with the statistical significance of 3σ . Next, the period of accelerated expansion in the very early Universe, called 'cosmic inflation', produced a stochastic background of primordial gravitational waves (GW). What generated GW? The leading idea is vacuum fluctuations in spacetime, but matter fields could also produce a significant amplitude of primordial GW. Finding its origin using CMB polarisation opens a new window into the physics behind inflation. These new scientific targets may influence how data from future CMB experiments are collected, calibrated, and analysed.

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“…Recently, it was reported in Ref. [32] that the Planck 2018 polarization data of cosmic microwave background (CMB) favors a nonzero value of isotropic CB, with statistical significance of 2.4 σ, based on the novel method [33][34][35]. The suggested rotation angle of the CMB polarization is 1 β = 0.35 ± 0.14 deg, (1) and future observations of CMB will reduce statistical uncertainties by more than one order of magnitude [36].…”

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confidence: 99%

Cosmic Birefringence Triggered by Dark Matter Domination

Nakagawa,

Takahashi,

Yamada

2021

Preprint

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Cosmic birefringence is predicted if an axion-like particle (ALP) moves after the recombination. We show that this naturally happens if the ALP is coupled to the dark matter density because it then acquires a large effective mass after the matter-radiation equality. Our scenario applies to a broad range of the ALP mass m φ 10 −28 eV, even smaller than the present Hubble constant. We give a simple model to realize this scenario, where dark matter is made of hidden monopoles, which give the ALP such a large effective mass through the Witten effect. The mechanism works if the ALP decay constant is of order the GUT scale without a fine-tuning of the initial misalignment angle. For smaller decay constant, the hidden monopole can be a fraction of dark matter. We also study the implications for the QCD axion, and show that the domain wall problem can be solved by the effective mass.

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Simultaneous determination of the cosmic birefringence and miscalibrated polarization angles II: Including cross-frequency spectra

Cited by 43 publications

References 26 publications

New Extraction of the Cosmic Birefringence from the Planck 2018 Polarization Data

New Extraction of the Cosmic Birefringence from the Planck 2018 Polarization Data

New physics from the polarised light of the cosmic microwave background

Cosmic Birefringence Triggered by Dark Matter Domination

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