Loop quantum cosmology: Physics of singularity resolution and its implications

Document Type

Article

Publication Date

12-3-2024

Abstract

The occurrences of singularities where spacetime curvature becomes infinite and geodesic evolution breaks down are inevitable events in classical general relativity (GR) unless one chooses an exotic matter violating weak energy condition. These singularities show up in various physical processes, such as the gravitational collapse, the birth of the universe in the standard cosmology as well as the classical solutions of the black hole spacetimes. In the last two decades, a rigorous understanding of the dynamics of quantum spacetime and the way it resolves singularities has been achieved in loop quantum cosmology (LQC) which applies the concepts and techniques of loop quantum gravity to the symmetry reduced cosmological spacetimes. Due to the fundamental discreteness of quantum geometry derived from the quantum theory, the bigbang singularity has been robustly shown to be replaced by a big bounce. Strong curvature singularities intrinsic in the classical cosmology are generically resolved for a variety of cosmological spacetimes including anisotropic models and polarized Gowdy models. Using effective spacetime description, the LQC universe also provides an ultra-violet complete description of the classical inflationary scenario as well as its alternatives such as the ekpyrotic and matterbounce scenarios. In this chapter, we provide a summary of singularity resolution and its physical implications for various isotropic and anisotropic cosmological spacetimes in LQC and analyze robustness of results through variant models originating from different quantization prescriptions.

Publication Source (Journal or Book title)

Handbook of Quantum Gravity

First Page

3983

Last Page

4037

This document is currently not available here.

Share

COinS