Cosmological Particle Production in Quantum Gravity

Universe

Yaser Tavakoli¹ 

[1] Department of Physics, University of Guilan, Namjoo Blv., Rasht 41335-1914, Iran;

关键词: loop quantum cosmology;    quantum fields in curved spacetime;   

DOI  :  10.3390/universe7080258

来源: DOAJ

【 摘 要 】

Quantum theory of a test field on a quantum cosmological spacetime may be viewed as a theory of the test field on an emergent classical background. In such a case, the resulting dressed metric for the field propagation is a function of the quantum fluctuations of the original geometry. When the backreaction is negligible, massive modes can experience an anisotropic Bianchi type I background. The field modes propagating on such a quantum-gravity-induced spacetime can then unveil interesting phenomenological consequences of the super-Planckian scales, such as gravitational particle production. The aim of this paper is to address the issue of gravitational particle production associated with the massive modes in such an anisotropic dressed spacetime. By imposing a suitable adiabatic condition on the vacuum state and computing the energy density of the created particles, the significance of the particle production on the dynamics of the universe in Planck era is discussed.

【 授权许可】

Unknown