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CMB circular and B-mode polarization from new interactions

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arxiv 1903.04578 v2 pith:BQKW4QEB submitted 2019-03-11 hep-ph astro-ph.CO

Nicola Bartolo , Ahmad Hoseinpour , Sabino Matarrese , Giorgio Orlando , Moslem Zarei This is my paper · ORCID
classification hep-phastro-ph.CO
keywords polarizationmodesb-modechargecircularconjugationdifferentgeneral
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Standard models describing the radiation transfer of the cosmic microwave background (CMB) through Compton scattering predict that cosmological scalar perturbations at linear order are not able to source V and B polarization modes. In this work, we investigate the possibility that such CMB polarization modes are generated even in the presence of linear scalar perturbations only. We provide a general parametrization of the photon-fermion forward-scattering amplitude and compute mixing terms between different CMB polarization modes. We discuss different general extensions of Standard Model interactions which violate discrete symmetries, while preserving the combination of charge conjugation, parity and time reversal. We show that it is possible to source CMB circular polarization by violating parity and charge conjugation symmetries. Instead, B-mode generation is associated to the violation of symmetry for time-reversal. Our results provide a useful tool to constrain new physics using CMB data.

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Cited by 4 Pith papers

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  1. Probing P and CP Violations on the Cosmological Collider

    hep-ph 2019-09 conditional novelty 6.0 of 10

    A rolling axion-like coupling to a massive gauge boson generates a CP-odd imaginary trispectrum of primordial fluctuations, while local four-scalar EFT operators in exact de Sitter space produce no observable signal.

  2. B-mode Power Spectrum of CMB via Polarized Compton Scattering

    astro-ph.CO 2019-09 conditional novelty 5.0 of 10

    Compton scattering off partially polarized electrons can generate B-mode polarization from scalar density perturbations, with an amplitude proportional to the square of the electron polarization asymmetry.

  3. Distinguishing Dirac from Majorana neutrinos in a microwave cavity

    hep-ph 2019-09 reject novelty 4.0 of 10

    A proposed microwave-cavity measurement of photon polarization flip from neutrino scattering claims to distinguish Majorana from Dirac neutrinos in a year, but the sensitivity formula contradicts that timeline.

  4. Microscopic QED origin of spin entanglement

    quant-ph 2026-08 reject novelty 3.0 of 10

    Starting from QED scattering, the paper derives dipolar spin interactions for two qubits and claims a distance-to-the-fourth-power effective interaction between two bath spins mediated by a virtual fermion.

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