A note on inflation and transplanckian physics

TL;DR

This paper examines how transplanckian physics might influence cosmic microwave background anisotropies during inflation, suggesting effects of order H/Λ due to vacuum choice ambiguities.

Contribution

It introduces a simple toy model for analytic calculations and discusses the expected magnitude of transplanckian effects on inflationary perturbations.

Findings

Effects are expected at order H/Λ due to vacuum ambiguities.

Analytic calculations support the potential significance of transplanckian physics.

The model provides a framework for estimating transplanckian influences on CMBR anisotropies.

Abstract

In this paper we consider the influence of transplanckian physics on the CMBR anisotropies produced by inflation. We consider a simple toy model that allows for analytic calculations and argue on general grounds, based on ambiguities in the choice of vacuum, that effects are expected with a magnitude of the order of $H/\Lambda$, where $H$ is the Hubble constant during inflation and $\Lambda$ the scale for new physics, e.g. the Planck scale.