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Platonic solids back in the sky: icosahedral inflation

Kang, Jonghee; Nicolis, Alberto

We generalize the model of solid inflation to an anisotropic cosmic solid. Barring fine tunings, the observed isotropy of the cosmological background and of the scalar two-point function isolate the icosahedral group as the only possible symmetry group of such a solid. In such a case, higher-point correlation functions—starting with the three-point one—are naturally maximally anisotropic, which makes the standard detection strategies highly inefficient and calls for a dedicated analysis of CMB data. The tensor two-point function can also be highly anisotropic, but only in the presence of sizable higher-derivative couplings.

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Title
Journal of Cosmology and Astroparticle Physics
DOI
https://doi.org/10.1088/1475-7516/2016/03/050

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Academic Units
Physics
Publisher
IOP Publishing
Published Here
October 26, 2016