Understand
Based on the renormalizable theory of gravitation recently proposed by Horava, we present a simple scenario to generate almost scale-invariant, super-horizon curvature perturbations.
- The anisotropic scaling with dynamical critical exponent z=3 implies that the amplitude of quantum fluctuations of a free scalar field generated in the early epoch of the expanding universe is insensitive to the Hubble expansion rate and, thus, scale-invariant.
- Those fluctuations are later converted to curvature perturbations by the curvaton mechanism or/and the modulated decay of heavy particles/oscillating fields.
- This scenario works, for example, for power law expansion a\propto t^p with p>1/3 and, thus, does not require inflation.
Built on
D. H. Lyth and D. Wands, “Generating the curvature perturbation without an inflaton,” Phys. Lett. B 524
2002
Earlier work this paper cites.
K. Enqvist and M. S. Sloth, “Adiabatic CMB perturbations in pre big bang string cosmology,” Nucl. Phys. B 626
2002
Earlier work this paper cites.
Similar
T. Moroi and T. Takahashi, “Effects of cosmological moduli fields on cosmic microwave background,” Phys. Lett. B 522
2002
Cited alongside, same era.
N. Arkani-Hamed, H. C. Cheng, M. A. Luty and S. Mukohyama, “Ghost condensation and a consistent infrared modification of gravity,” JHEP 0405
2004
Cited alongside, same era.
P. Horava, “Quantum Gravity at a Lifshitz Point,” arXiv:0901.3775 [hep-th]
Cited in the paper.
Cited in the paper.
G. Calcagni, “Cosmology of the Lifshitz universe,” arXiv:0904.0829 [hep-th]
Cited in the paper.
E. Kiritsis and G. Kofinas, “Horava-Lifshitz Cosmology,” arXiv:0904.1334 [hep-th]
Cited in the paper.
H. Lu, J. Mei and C. N. Pope, “Solutions to Horava Gravity,” arXiv:0904.1595 [hep-th]
Cited in the paper.
R. L. Arnowitt, S. Deser and C. W. Misner, “The dynamics of general relativity,” arXiv:gr-qc/0405109
Cited in the paper.
L. Kofman, “Probing string theory with modulated cosmological fluctuations,” arXiv:astro-ph/0303614
Cited in the paper.
Then
N. Arkani-Hamed, P. Creminelli, S. Mukohyama and M. Zaldarriaga, “Ghost Inflation,” JCAP 0404
2004
Later among the works it cites.
G. Dvali, A. Gruzinov and M. Zaldarriaga, “A new mechanism for generating density perturbations from inflation,” Phys. Rev. D 69
2004
Later among the works it cites.
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