MG13 - Talk detail

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 Participant

Institution

Session

Accepted

Yes

Order

Time

Talk

Title

Abstract

I will discuss possible tests of Loop Quantum Cosmology (LQC) through cosmological perturbations and their consequences on the Cosmic Microwave background (CMB). It has been known for quite a long time that tensor perturbations are a promising way to possibly investigate the predictions of the theory. However, we have recently understood -in particular thanks to the study of vector and scalar modes- that the algebra usually assumed was in fact not correct. The requirement of anomaly-freedom for vector and scalar perturbations leads to modifications of the every-mode algebra. I will explain this for the two main corrections implied by LQC, namely the holonomy and inverse-triad terms. Then, I will mainly focus of holonomy corrections in the bouncing scenario. I will explain a possible generic way to derive the anomaly-free and gauge-invariant variables. I will also show that a specific scheme (the so-called mu-bar scheme), usually assumed for other reasons, naturally appears. This approach will also be briefly discussed for inverse-triads. Finally I will show how a metric signature change (from lorentzian to euclidean) seems to naturally occur in this model around the bounce, possibly bridging this approach with the Hartle-Hawking proposal.

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