Breaking the scale invariance of the primordial power spectrum in Horava-Lifshitz Cosmology

Abstract

We study the spectral tilt of primordial perturbations in Horava-Lifshitz cosmology. The uniform approximation, which is a generalization of the familiar Wentzel-Kramers-Brillouin (WKB) method, is employed to compute the spectral index both numerically and analytically in a closed form. We clarify how the spectral index depends on the inflation model and parameters in the modified dispersion relation.

5 pages, 2 figures, accepted for publication in Physical Review D

References in corpus (4)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Quantum Gravity at a Lifshitz Point
• Chiral Primordial Gravitational Waves from a Lifshitz Point
• Primordial perturbation with a modified dispersion relation

Cited by in corpus (8)

• Dynamical behavior in mimetic F(R) gravity
• Oscillating Universe in Horava-Lifshitz Gravity
• Stability of spin-0 graviton and strong coupling in Horava-Lifshitz theory of gravity
• Cosmology in nonrelativistic general covariant theory of gravity
• Vector and tensor perturbations in Horava-Lifshitz cosmology
• Gravitational quantum effects on power spectra and spectral indices with higher-order corrections
• Stability of Singularity-free Cosmological Solutions in Hořava-Lifshitz Gravity
• Power spectra of scalar and tensor modes in modified Horava-Lifshitz gravity