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Effects of modified gravity on B-mode polarization

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arxiv 1405.7004 v2 pith:KNBAPV7L submitted 2014-05-27 astro-ph.CO gr-qchep-phhep-th

Luca Amendola , Guillermo Ballesteros , Valeria Pettorino (University of Heidelberg) This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords effectsspeeddependsgravitationalgravitylensingmodifiedamplitude
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We explore the impact of modified gravity on B-modes, identifying two main separate effects: lensing and propagation of tensor modes. The location of the inflationary peak of the BB spectrum depends on the speed of gravitational waves; the amplitude of the lensing contribution depends on the anisotropic stress. We single out these effects using the quasi-static regime and considering models for which the background and the growth of matter perturbations are standard. Using available data we obtain that the gravitational wave speed is compatible with the speed of light and constrained to within about 10%.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. 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.

  2. Parametrizations for tests of gravity

    astro-ph.CO 2019-08 accept novelty 1.0 of 10

    A review of parametrized frameworks (PPF, EFT, PPN, ppE) for testing gravity across cosmological and astrophysical scales, with an outlook toward unification.

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