Testing loop quantum cosmology

Abstract

Loop quantum cosmology predicts that quantum gravity effects resolve the big-bang singularity and replace it by a cosmic bounce. Furthermore, loop quantum cosmology can also modify the form of primordial cosmological perturbations, for example by reducing power at large scales in inflationary models or by suppressing the tensor-to-scalar ratio in the matter bounce scenario; these two effects are potential observational tests for loop quantum cosmology. In this article, I review these predictions and others, and also briefly discuss three open problems in loop quantum cosmology: its relation to loop quantum gravity, the trans-Planckian problem, and a possible transition from a Lorentzian to a Euclidean space-time around the bounce point.

20 pages. Invited review for special edition "Testing quantum gravity with cosmology" of Comptes Rendus Physique

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Cited by in corpus (48)

• A Short Review of Loop Quantum Gravity
• Towards Cosmological Dynamics from Loop Quantum Gravity
• Effective loop quantum cosmology as a higher-derivative scalar-tensor theory
• Hybrid Loop Quantum Cosmology: An Overview
• Primordial scalar power spectrum from the hybrid approach in loop cosmologies
• Primordial power spectrum from the Dapor-Liegener model of loop quantum cosmology
• Time-dependent mass of cosmological perturbations in the hybrid and dressed metric approaches to loop quantum cosmology
• Non-Gaussianity in Loop Quantum Cosmology
• The Vacuum State of Primordial Fluctuations in Hybrid Loop Quantum Cosmology
• Primordial power spectrum from the dressed metric approach in loop cosmologies
• Probability of Warm Inflation in Loop Quantum Cosmology
• Phenomenological implications of modified loop cosmologies: an overview
• Non-oscillating power spectra in Loop Quantum Cosmology
• Emergent Cosmology from Quantum Gravity in the Lorentzian Barrett-Crane Tensorial Group Field Theory Model
• Observational Constraints on Warm Inflation in Loop Quantum Cosmology
• Hamiltonian formulation and loop quantization of a recent extension of the Kruskal spacetime
• The Lensing Effect of Quantum-Corrected Black Hole and Parameter Constraints from EHT Observations
• Periodic orbits and gravitational wave radiation in short hair black hole spacetimes for an extreme mass ratio system
• Scalar spectra of primordial perturbations in loop quantum cosmology
• Anomaly free cosmological perturbations with generalised holonomy correction in loop quantum cosmology
• Phase space analysis of the bouncing universe with stringy effects
• Preinflationary perturbations from the closed algebra approach in loop quantum cosmology
• Quantum fields in the background spacetime of a loop quantum gravity black hole
• Constraints from Solar System tests on a covariant loop quantum black hole
• Loop quantum cosmology: relation between theory and observations
• A first step towards the inflationary trans-planckian problem treatment in Loop Quantum Cosmology
• Fermions in Hybrid Loop Quantum Cosmology
• Could Planck Star Remnants be Dark Matter?
• Perturbations in Quantum Cosmology: The Continuum Limit in Fourier Space
• Mass of cosmological perturbations in the hybrid and dressed metric formalisms of Loop Quantum Cosmology for the Starobinsky and exponential potentials
• Hamiltonian analysis of the BFCG formulation of General Relativity
• Quasinormal modes of a charged loop quantum black hole
• Gravitational Particle Production and the Validity of Effective Descriptions in Loop Quantum Cosmology
• Scalar Cosmological Perturbations from Quantum Entanglement within Lorentzian Quantum Gravity
• Impact of generalized holonomy corrections on the cosmological primordial power spectra
• Universal properties of the evolution of the Universe in modified loop quantum cosmology
• Effects of the inflaton potential on the primordial power spectrum in Loop Quantum Cosmology scenarios
• Loop Quantum Cosmology with a noncommutative quantum deformed photon gas
• Particle Deflections around Microscopic Loop Quantum Black Holes with Rigorous Quantum Parameters
• Primordial perturbations in kinetically dominated regimes of general relativity and hybrid quantum cosmology
• Regularization of the cosmological sector of loop quantum gravity with bosonic matter and the related problems with general covariance of quantum corrections
• On the evolution of the volume in Loop Quantum Cosmology
• Quantization ambiguities and the robustness of effective descriptions of primordial perturbations in hybrid Loop Quantum Cosmology
• Correction to Hawking radiation in non-singular gravitational collapse
• Semiclassical Length Measure from a Quantum-Gravity Wave Function
• Non singular M theory Universe in Loop Quantum Cosmology -- inspired Models
• Non-oscillating vacuum states and the quantum homogeneity and isotropy hypothesis in Loop Quantum Cosmology
• Gaussian Planck Relics are Ruled-Out as Dark Matter by LIGO