Primordial perturbations in a rainbow universe with running Newton constant

被引：8
作者：
Brighenti, Francesco [1 ,2 ]
Gubitosi, Giulia [3 ]
Magueijo, Joao [3 ]
机构：
[1] Univ Bologna, Dipartimento Fis & Astron, Via Irnerio 46, I-40126 Bologna, Italy
[2] Ist Nazl Fis Nucl, Sez Bologna, Via Irnerio 46, I-40126 Bologna, Italy
[3] Imperial Coll, Blackett Lab, Theoret Phys, London SW7 2BZ, England
来源：
PHYSICAL REVIEW D | 2017年 / 95卷 / 06期
关键词：
GRAVITY;
D O I：
10.1103/PhysRevD.95.063534
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We compute the spectral index of primordial perturbations in a rainbow universe. We allow the Newton constant G to run at (super-) Planckian energies and we consider both vacuum and thermal perturbations. If the rainbow metric is the one associated to a generalized Horava-Lifshitz dispersion relation, we find that only when G tends asymptotically to 0 can one match the observed value of the spectral index and solve the horizon problem, both for vacuum and thermal perturbations. For vacuum fluctuations the observational constraints imply that the primordial universe expansion can be both accelerating or decelerating, while in the case of thermal perturbations only decelerating expansion is allowed.
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页数：7
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