Dressed metric predictions revisited

Kaminski W, Kolanowski M, Lewandowski J (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Classical and Quantum Gravity Institute of Physics: Hybrid Open Access

Book Volume: 37

Journal Issue: 9

DOI: 10.1088/1361-6382/ab7ee0

Abstract

It was recently shown that the volume operator of loop quantum cosmology (LQC) and all its positive powers are ill-defined on physical states. In this paper, we investigate how it effects predictions of cosmic microwave background (CMB) power spectra obtained within dressed metric approach for which expectations values of a are the key element. We find that almost every step in the procedure is ill-defined and relies heavily upon a (seemingly premature) numerical truncation. Thus, it suggests that more care is needed in making predictions regarding pre-inflationary physics. We propose a new scheme which contains only well-defined quantities. The surprising agreement of the hitherto models with observational data, especially at low angular momenta l is explained.

Authors with CRIS profile

Jerzy Lewandowski Chair for Theoretical Physics III (Quantum Gravity)

Involved external institutions

University of Warsaw / Uniwersytet Warszawski PL Poland (PL)

How to cite

APA:

Kaminski, W., Kolanowski, M., & Lewandowski, J. (2020). Dressed metric predictions revisited. Classical and Quantum Gravity, 37(9). https://doi.org/10.1088/1361-6382/ab7ee0

MLA:

Kaminski, Wojciech, Maciej Kolanowski, and Jerzy Lewandowski. "Dressed metric predictions revisited." Classical and Quantum Gravity 37.9 (2020).

BibTeX: Download