GRG Editor's Choice: Primordial power spectrum from the Dapor–Liegener model of loop quantum cosmology

Agullo, I., Primordial power spectrum from the Dapor–Liegener model of loop quantum cosmology, Gen Relativ Gravit (2018) 50: 91. https://doi.org/10.1007/s10714-018-2413-1

Editor's Choice (Research Article)

First Online: 03 July 2018

"This paper is scientifically strong and extremely well written. Indeed, the dynamics of the underlying background geometry is better explained here than in the original Dapor–Liegener paper or in the follow up paper with Assanioussi and Pawlowski."

Abstract:

We compute the predictions for the power spectrum of scalar perturbations from a recent new proposal for the effective Hamiltonian of loop quantum cosmology. The model provides an attractive picture of the early cosmos, in which our classical Friedmann–Lemaître–Robertson–Walker universe emerges from a quantum phase where the spacetime curvature remains constant and of Planckian size. We compare the predictions for the cosmic microwave background with previous results obtained within loop quantum cosmology, and discuss the differences and similarities. The analysis provides an example of the way differences between quantization schemes can be translated to physical observables.

The author: 

Ivan Agullo is Assistant Professor in the Department of Physics & Astronomy at Louisiana State University in Baton Rouge. He is working on the interface of quantum mechanics and gravitation, specifically, quantum field theory in curved spacetimes and its application to cosmology, and quantum gravity/cosmology. For the Springer Handbook of Spacetime (2014), he contributed the chapter on "Loop Quantum Cosmology" with Alejandro Corichi.

GRG Editor's Choice:

In each volume of GRG, a few papers are marked as “Editor’s Choice”. The primary criteria is original, high quality research that is of wide interest within the community.