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2015

A separate universe view of the asymmetric sky

Kobayashi, Takeshi, Cortês, Marina, Liddle, Andrew R.

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We provide a unified description of the hemispherical asymmetry in the cosmic microwave background generated by the mechanism proposed by Erickcek, Kamionkowski, and Carroll, using a delta N formalism that consistently accounts for the asymmetry-generating mode throughout.

We derive a general form for the power spectrum which explicitly exhibits the broken translational invariance.
This can be directly compared to cosmic microwave background observables, including the observed quadrupole and fNL values, automatically incorporating the Grishchuk--Zel'dovich effect.
Our calculation unifies and extends previous calculations in the literature, in particular giving the full dependence of observables on the phase of our location in the super-horizon mode that generates the asymmetry.

A separate universe view of the asymmetric sky · Around

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D. H. Lyth, K. A. Malik and M. Sasaki, JCAP 0505
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A. L. Erickcek, M. Kamionkowski, and S. M. Carroll, Phys. Rev. D 78
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2008
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A. L. Erickcek, S. M. Carroll, and M. Kamionkowski, Phys. Rev. D 78
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H. K. Eriksen et al., Astrophys. J. 605
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2015

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