Statistically Anisotropic Tensor Modes from Inflation

Abstract

We consider the inflationary universe with a spectator scalar field coupled to a $U(1)$ gauge field and calculate curvature perturbation and gravitational waves (GWs). We find that the sourced GWs can be larger than the one from vacuum fluctuation and they are statistically anisotropic as well as linearly polarized. The GW power spectrum acquires higher multipole moments as ${\mathcal{P}}_h\propto (1-{\cos }^2\theta +{\cos }^4\theta -{\cos }^6\theta )$ irrespective of the model parameters.

23 pages and 7 figures

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Cited by in corpus (24)

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• Non-Gaussianity from Axion-Gauge Fields Interactions during Inflation
• Possible detection of nonclassical primordial gravitational waves with Hanbury Brown - Twiss interferometry
• Probing the inflationary particle content: extra spin-2 field
• Mixed Non-Gaussianity from Axion-Gauge Field Dynamics
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• Anisotropic inflation with coupled $\mathbf{p}$-forms
• Charged Vector Inflation
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• Gravitational wave trispectrum in the axion-SU(2) model
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• Statistical anisotropy in galaxy ellipticity correlations
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• Hunting for Statistical Anisotropy in Tensor Modes with B-mode Observations
• Minimum variance estimation of statistical anisotropy via galaxy survey
• Synthetic Gravitational Waves from a Rolling Axion Monodromy
• Statistically-Anisotropic Tensor Bispectrum from Inflation
• Inflation with two-form field: the production of primordial black holes and gravitational waves