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Similar

S. Mollerach, “Isocurvature Baryon Perturbations And Inflation,” Phys. Rev. D 42
2002
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C. L. Bennett et al
2003
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P. Creminelli, A. Nicolis, E. Trincherini, “Galilean Genesis: An Alternative to inflation,” JCAP 1011
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Then

M. Osipov and V. Rubakov, “Scalar tilt from broken conformal invariance,” JETP Lett. 93
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J. -O. Gong, J. -c. Hwang, W. -I. Park, M. Sasaki and Y. -S. Song, “Conformal invariance of curvature perturbation,” JCAP 1109
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2011
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K. Hinterbichler and J. Khoury, “The Pseudo-Conformal Universe: Scale Invariance from Spontaneous Breaking of Conformal Symmetry,” JCAP 1204

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2012

Scale-Invariant Fluctuations from Galilean Genesis

Wang, Yi, Brandenberger, Robert

Understand

We study the spectrum of cosmological fluctuations in scenarios such as Galilean Genesis in which a spectator scalar field acquires a scale-invariant spectrum of perturbations during an early phase which asymptotes in the far past to Minkowski space-time.

In the case of minimal coupling to gravity and standard scalar field Lagrangian, the induced curvature fluctuations depend quadratically on the spectator field and are hence non-scale-invariant and highly non-Gaussian.
We show that if higher dimensional operators (the same operators that lead to the {\eta}-problem for inflation) are considered, a linear coupling between background and spectator field fluctuations is induced which leads to scale-invariant and Gaussian curvature fluctuations.