https://doi.org/10.1140/epjc/s10052-015-3457-y
Regular Article - Theoretical Physics
Nearly scale-invariant power spectrum and quantum cosmological perturbations in the gravity’s rainbow scenario
1
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100049, China
2
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
* e-mail: wangsai@itp.ac.cn
Received:
22
December
2014
Accepted:
13
May
2015
Published online:
11
June
2015
We propose the gravity’s rainbow scenario as a possible alternative of the inflation paradigm to account for the flatness and horizon problems. We focus on studying the cosmological scalar perturbations which are seeded by the quantum fluctuations in the very early universe. The scalar power spectrum is expected to be nearly scale-invariant. We estimate the rainbow index 
and energy scale M in the gravity’s rainbow scenario by analyzing the Planck temperature and WMAP polarization datasets. The constraints on them are given by 
and 
at the 
confidence level.
© The Author(s), 2015
