English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A consistent implementation of quantum gravity is expected to change thefamiliar notions of space, time and the propagation of matter in drastic ways.This will have consequences on very small scales, but also gives rise tocorrection terms in evolution equations of modes relevant for observations. Inparticular, the evolution of inhomogeneities in the very early universe shouldbe affected. In this paper consistent evolution equations for gauge-invariantperturbations in the presence of inverse triad corrections of loop quantumgravity are derived. Some immediate effects are pointed out, for instanceconcerning conservation of power on large scales and non-adiabaticity. It isalso emphasized that several critical corrections can only be seen to arise ina fully consistent treatment where the gauge freedom of canonical gravity isnot fixed before implementing quantum corrections. In particular, metric modesmust be allowed to be inhomogeneous: it is not consistent to assume only matterinhomogeneities on a quantum corrected homogeneous background geometry. In thisway, stringent consistency conditions arise for possible quantizationambiguities which will eventually be further constrained observationally.

Gauge invariant cosmological perturbation equations with corrections from loop quantum gravity