Gravitational Particle Production and the Validity of Effective Descriptions in Loop Quantum Cosmology
arXiv:2207.00435 · doi:10.1103/PhysRevD.106.043518
Abstract
The effective approach in Loop Quantum Cosmology (LQC) has provided means to obtain predictions for observable quantities in LQC models. While an effective dynamics in LQC has been extensively considered in different scenarios, a robust demonstration of the validity of effective descriptions for the perturbative level still requires further attention. The consistency of the description adopted in most approaches requires the assumption of a test field approximation, which is limited to the cases in which the backreaction of the particles gravitationally produced can be safely neglected. Within the framework of LQC, some of the main approaches to quantize the linear perturbations are the dressed metric, the hybrid approaches and the closed/deformed algebra approach. Here, we analyze the consistency of the test field assumption in these frameworks by computing the energy density stored in the particles gravitationally produced compared to the background energy density. This analysis ultimately provides us with a consistency test of the effective descriptions of LQC.
Replaced with version matching the one published in the Physical Review D
References in corpus (21)
- Quantum Nature of the Big Bang: Improved dynamics
- Quantum Nature of the Big Bang
- Quantum Nature of the Big Bang: An Analytical and Numerical Investigation
- Loop quantum cosmology of k=1 FRW models
- Are loop quantum cosmos never singular?
- Anomaly freedom in perturbative loop quantum gravity
- Closed FRW model in Loop Quantum Cosmology
- Hybrid Quantum Gowdy Cosmology: Combining Loop and Fock Quantizations
- Hybrid quantization of an inflationary universe
- Consistency of holonomy-corrected scalar, vector and tensor perturbations in Loop Quantum Cosmology
- Quantum field theory on a cosmological, quantum space-time
- Matter creation in a nonsingular bouncing cosmology
- Inhomogeneous Loop Quantum Cosmology: Hybrid Quantization of the Gowdy Model
- Cosmological perturbations in Hybrid Loop Quantum Cosmology: Mukhanov-Sasaki variables
- Quantum nature of cosmological bounces
- Particle Creation in Bouncing Cosmologies
- Hybrid Quantum Cosmology: Combining Loop and Fock Quantizations
- Gravitational quantum effects on power spectra and spectral indices with higher-order corrections
- Creation of particles in a cyclic universe driven by loop quantum cosmology
- Gravitational Particle Production in Loop Quantum Cosmology
- Cosmological particle production in quantum gravity