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Dynamical vs spectator models of (pseudo-)conformal Universe · Around

2011

Dynamical vs spectator models of (pseudo-)conformal Universe

Libanov, M., Rubakov, V.

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We discuss two versions of the conformal scenario for generating scalar cosmological perturbations: a spectator version with a scalar field conformally coupled to gravity and carrying negligible energy density, and a dynamical version with a scalar field minimally coupled to gravity and dominating the cosmological evolution.

By making use of the Newtonian gauge, we show that (i) no UV strong coupling scale is generated below $M_{Pl}$ due to mixing with metric perturbations in the dynamical scenario, and (ii) the dynamical and spectator models yield identical results to the leading non-linear order.
We argue that these results, which include potentially observable effects like statistical anisotropy and non-Gaussianity, are characteristic of the entire class of conformal models.
As an example, we reproduce, within the dynamical scenario and working in comoving gauge, our earlier result on the statistical anisotropy, which was originally obtained within the spectator approach.

Built on

I. Antoniadis, P. O. Mazur and E. Mottola, “Conformal invariance and cosmic background radiation,” Phys. Rev. Lett. 79
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A. D. Linde and V. F. Mukhanov, Nongaussian isocurvature perturbations from inflation, Phys. Rev. D 56
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J. Khoury, B. A. Ovrut, P. J. Steinhardt and N. Turok, “The ekpyrotic universe: Colliding branes and the origin of the hot big bang,” Phys. Rev. D 64
2002
Earlier work this paper cites.

Similar

G. Dvali, A. Gruzinov and M. Zaldarriaga, “A new mechanism for generating density perturbations from inflation”, Phys. Rev. D 69
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V. A. Rubakov, “Harrison–Zeldovich spectrum from conformal invariance”, JCAP 0909
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2009
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A. Nicolis, R. Rattazzi and E. Trincherini, “The Galileon as a local modification of gravity,” Phys. Rev. D 79
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2009
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K. Hinterbichler and J. Khoury, “The Pseudo-Conformal Universe: Scale Invariance from Spontaneous Breaking of Conformal Symmetry,” arXiv:1106.1428 [hep-th]
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M. Libanov, S. Mironov and V. Rubakov, “Properties of scalar perturbations generated by conformal scalar field,” arXiv:1012.5737 [hep-th]
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M. Libanov, S. Mironov and V. Rubakov, “Non-Gaussianity of scalar perturbations generated by conformal mechanisms,” arXiv:1105.6230 [astro-ph.CO]
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L. P. Levasseur, R. Brandenberger and A. C. Davis, “Defrosting in an Emergent Galileon Cosmology,” arXiv:1105.5649 [astro-ph.CO]
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X. Gao, “Conserved cosmological perturbation in Galileon models,” arXiv:1106.0292 [astro-ph.CO]
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Then

P. Creminelli, A. Nicolis and E. Trincherini, “Galilean Genesis: an alternative to inflation,” JCAP 1011
Original
2010
Later among the works it cites.
M. Libanov and V. Rubakov, “Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy,” JCAP 1011
Original
2010
Later among the works it cites.
M. Libanov, S. Ramazanov and V. Rubakov, “Scalar perturbations in conformal rolling scenario with intermediate stage,” JCAP 1106
Original
2011
Closest in time.

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