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2015

Platonic solids back in the sky: Icosahedral inflation

Kang, Jonghee, Nicolis, Alberto

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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.

Platonic solids back in the sky: Icosahedral inflation · Around

Built on

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D. B. Litvin, “The icosahedral point groups,” Acta Crystallographica Section A
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Earlier work this paper cites.
A. Gruzinov, “Elastic inflation,” Phys. Rev
2004
Earlier work this paper cites.
D. Babich, P. Creminelli, and M. Zaldarriaga, “The Shape of non-Gaussianities,” JCAP
2004
Earlier work this paper cites.

Similar

S. Dubovsky, T. Gregoire, A. Nicolis, and R. Rattazzi, “Null energy condition and superluminal propagation,” JHEP
2006
Cited alongside, same era.
C. Cheung, P. Creminelli, A. L. Fitzpatrick, J. Kaplan, and L. Senatore, “The Effective Field Theory of Inflation,” JHEP
Original
2008
Cited alongside, same era.
S. Endlich, A. Nicolis, and J. Wang, “Solid Inflation,” JCAP
Original
2013
Cited alongside, same era.
N. Bartolo, S. Matarrese, M. Peloso, and A. Ricciardone, “Anisotropy in solid inflation,” JCAP
Original
2013
Cited alongside, same era.

Then

M. Sitwell and K. Sigurdson, “Quantization of Perturbations in an Inflating Elastic Solid,” Phys. Rev
Original
2014
Later among the works it cites.
S. Endlich, B. Horn, A. Nicolis, and J. Wang, “Squeezed limit of the solid inflation three-point function,” Phys.Rev
Original
2014
Later among the works it cites.
N. Bartolo, M. Peloso, A. Ricciardone, and C. Unal, “The expected anisotropy in solid inflation,” JCAP
Original
2014
Later among the works it cites.

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