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Statistically Anisotropic Tensor Modes from Inflation

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arxiv 1801.02778 v1 pith:7V5XVHUW submitted 2018-01-09 astro-ph.CO gr-qchep-phhep-th

Tomohiro Fujita , Ippei Obata , Takahiro Tanaka , Shuichiro Yokoyama This is my paper · ORCID
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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.

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  1. Shapes and orientations of massive halos in the statistically anisotropic universe

    astro-ph.CO 2025-05 conditional novelty 6.0 of 10

    Quadrupolar statistical anisotropy in initial conditions leaves cluster shapes unchanged but aligns the major axes of massive halos, more strongly for higher mass.

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