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Scale-invariant cosmological perturbations from Horava-Lifshitz gravity without inflation

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arxiv 0904.2190 v4 pith:F75POIA4 submitted 2009-04-15 hep-th astro-ph.COgr-qchep-ph

Shinji Mukohyama This is my paper · ORCID
classification hep-thastro-ph.COgr-qchep-ph
keywords perturbationsscale-invariantscenariocurvatureexpansionfluctuationsinflationthus
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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. Also, this scenario does not rely on any additional assumptions such as the detailed balance condition.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Anisotropic quantum universe in Ho\v{r}ava-Lifshitz gravity

    gr-qc 2025-05 conditional novelty 6.0 of 10

    In the small-universe limit of Horava-Lifshitz gravity, the Wheeler-DeWitt equation separates and the anisotropy wave functions become normalizable harmonic-oscillator states, predicting small initial anisotropies set...

  2. HBT Interferometry and Quantum Nature of Primordial Gravitational Waves in Ho\v{r}ava-Lifshitz Gravity

    gr-qc 2024-12 conditional novelty 6.0 of 10

    In Hořava-Lifshitz gravity, primordial gravitational waves can be generated without inflation and their nonclassical statistics might be detectable by HBT interferometry above about 10 kHz in the radiation era or 10^-...

  3. The Wave Function of the Universe and Inflation

    gr-qc 2025-10 reject novelty 3.0 of 10

    Rearranging the Wheeler-DeWitt equation defines the inflaton potential in terms of an arbitrary wave-function phase and amplitude; nothing constrains that wave function, so the potential is relabeled rather than deriv...

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