Modification from Noncommutative Inflation

TL;DR

This paper investigates how noncommutative geometry influences single field inflation models, modifies the power spectrum, and compares these predictions with WMAP five-year data, revealing potential explanations for observed spectral features.

Contribution

It introduces a nearly model-independent modification to inflationary spectra due to noncommutative effects and compares these with observational data.

Findings

Modified spectra can explain large spectral index

Small running of the spectral index is consistent with data

Noncommutative effects are nearly model independent at leading order

Abstract

We explore the noncommutative effect on single field inflation and compare with WMAP five-year data. First, we calculate the noncommutative effect from the potential and dynamical terms, and construct the general form of modified power spectrum. Second, we consider the leading order modification of slow-roll, DBI and K-inflation and unite the modification, which means the modification is nearly model independent at this level. Finally, comparing with the WMAP5 data, we find that the modified can be well realized as the origin of the relative large spectral index and the quite small running.