Generalized Non-Commutative Inflation

TL;DR

This paper explores how non-commutative geometry modifies energy-momentum relations, leading to a new framework for inflation driven by radiation, extending previous models with a mathematically consistent approach based on symmetry structures.

Contribution

It introduces a novel, symmetry-based formulation of non-commutative inflation that generalizes earlier dispersion relation models and provides conditions for successful inflation.

Findings

Derived inequalities for dispersion relations that enable inflation.

Established a connection between non-commutative symmetries and inflationary dynamics.

Proposed a numerical approach to identify inflationary dispersion relations.

Abstract

Non-commutative geometry indicates a deformation of the energy-momentum dispersion relation $f(E)\equiv\frac{E}{pc}(\neq 1)$ for massless particles. This distorted energy-momentum relation can affect the radiation dominated phase of the universe at sufficiently high temperature. This prompted the idea of non-commutative inflation by Alexander, Brandenberger and Magueijo (2003, 2005 and 2007). These authors studied a one-parameter family of non-relativistic dispersion relation that leads to inflation: the $\alpha$ family of curves $f(E)=1+(\lambda E)^{\alpha}$. We show here how the conceptually different structure of symmetries of non-commutative spaces can lead, in a mathematically consistent way, to the fundamental equations of non-commutative inflation driven by radiation. We describe how this structure can be considered independently of (but including) the idea of non-commutative spaces as a starting point of the general inflationary deformation of $SL(2,\mathbb{C})$. We analyze the conditions on the dispersion relation that leads to inflation as a set of inequalities which plays the same role as the slow roll conditions on the potential of a scalar field. We study conditions for a possible numerical approach to obtain a general one parameter family of dispersion relations that lead to successful inflation.