Early universe in quantum gravity

Modesto, Leonardo1,2; Calcagni, Gianluca3

2024-08-22

10.1007/JHEP08(2024)194

JOURNAL OF HIGH ENERGY PHYSICS   影响因子和分区

1029-8479

We present a new picture of the early universe in finite nonlocal quantum gravity, which is Weyl invariant at the classical and quantum levels. The high-energy regime of the theory consists of two phases, a Weyl invariant trans-Planckian phase and a post-Planckian or Higgs phase described by an action quadratic in the Ricci tensor and where the cosmos evolves according to the standard radiation-dominated model. In the first phase, all the issues of the hot big bang such as the singularity, flatness, and horizon problems find a universal and simple non-inflationary solution by means of Weyl invariance, regardless of the microscopic details of the theory. In the second phase, once Weyl symmetry is spontaneously broken, primordial perturbations are generated around a background that asymptotically evolves as a radiation-dominated flat Friedmann-Lema & icirc;tre-Robertson-Walker universe.

Cosmological models Models of Quantum Gravity

SCI

英语

其他

Spanish Ministry of Science and Innovation MCIN/AEI[PID2020-118159GB-C41] ; Basic Research Program of the Science, Technology, and Innovation Commission of Shenzhen Municipality[JCYJ20180302174206969]

Physics

Physics, Particles & Fields

WOS:001297118700004

SPRINGER

PHYSICS

Web of Science

1.Univ Cagliari, Dipartimento Fis, Cittadella Univ, I-09042 Monserrato, Italy
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.CSIC, Inst Estruct Mat, Serrano 121, Madrid 28006, Spain

Modesto, Leonardo,Calcagni, Gianluca. Early universe in quantum gravity[J]. JOURNAL OF HIGH ENERGY PHYSICS,2024(8).

Modesto, Leonardo,&Calcagni, Gianluca.(2024).Early universe in quantum gravity.JOURNAL OF HIGH ENERGY PHYSICS(8).

Modesto, Leonardo,et al."Early universe in quantum gravity".JOURNAL OF HIGH ENERGY PHYSICS .8(2024).