Non-singular bounce scenarios in loop quantum cosmology and the effective field description

Abstract

A non-singular bouncing cosmology is generically obtained in loop quantum cosmology due to non-perturbative quantum gravity effects. A similar picture can be achieved in standard general relativity in the presence of a scalar field with a non-standard kinetic term such that at high energy densities the field evolves into a ghost condensate and causes a non-singular bounce. During the bouncing phase, the perturbations can be stabilized by introducing a Horndeski operator. Taking the matter content to be a dust field and an ekpyrotic scalar field, we compare the dynamics in loop quantum cosmology and in a non-singular bouncing effective field model with a non-standard kinetic term at both the background and perturbative levels. We find that these two settings share many important properties, including the result that they both generate scale-invariant scalar perturbations. This shows that some quantum gravity effects of the very early universe may be mimicked by effective field models.

12 pages, 5 figures, v2: references added

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Cited by in corpus (27)

• A Critical Review of Classical Bouncing Cosmologies
• Bouncing Cosmology in f(Q) Symmetric Teleparallel Gravity
• Matter creation in a nonsingular bouncing cosmology
• Matter Bounce Loop Quantum Cosmology from $F(R)$ Gravity
• Bouncing cosmologies with dark matter and dark energy
• A $\Lambda$CDM bounce scenario
• Quantum Gravity in the Sky: Interplay between fundamental theory and observations
• Bounce universe from string-inspired Gauss-Bonnet gravity
• Viability of the matter bounce scenario in Loop Quantum Cosmology for general potentials
• Reheating in quintessential inflation via gravitational production of heavy massive particles: A detailed analysis
• Nonsingular bouncing cosmologies in light of BICEP2
• $\Lambda$CDM Bounce Cosmology without $\Lambda$CDM: the case of modified gravity
• Non-singular Bounce Cosmology from Lagrange Multiplier $F(R)$ Gravity
• Loop quantum cosmology of a radiation-dominated flat FLRW universe
• Converting entropy to curvature perturbations after a cosmic bounce
• Fermi-bounce cosmology and the fermion curvaton mechanism
• The Classical and Loop Quantum Cosmology Phase Space of Interacting Dark Energy and Superfluid Dark Matter
• Magnetogenesis in bouncing cosmology
• Reconstruction of mimetic gravity in a non-singular bouncing universe from quantum gravity
• Unimodular $f(G)$ gravity
• Primordial power spectrum from a matter-Ekpyrotic bounce scenario in loop quantum cosmology
• Quantum matter bounce with a dark energy expanding phase
• Viable non-singular cosmic bounce in holonomy improved F(R) gravity endowed with a Lagrange multiplier
• Reconstructing the Universe Evolution from Loop Quantum Cosmology Scalar Fields
• Inflationary Cosmology with Quantum Gravitational Effects and the Swampland Conjectures
• A quasi-matter bounce equivalent to Starobinsky inflation
• Unifying turnaround-bounce cosmology in a cyclic universe considering a running vacuum model