Particle physics models of inflation and curvaton scenarios

TL;DR

This paper reviews particle physics models of inflation and curvaton mechanisms, focusing on their origins, reheating processes, and potential for experimental verification through CMB data and collider experiments.

Contribution

It compares hidden sector and MSSM-based models of inflaton and curvaton, highlighting their testability and low-energy physics motivations.

Findings

Models embedded in MSSM are well-motivated and testable.

Hidden sector models couple weakly to the Standard Model.

Stringy and bouncing universe scenarios are briefly discussed.

Abstract

We review the particle theory origin of inflation and curvaton mechanisms for generating large scale structures and the observed temperature anisotropy in the cosmic microwave background (CMB) radiation. Since inflaton or curvaton energy density creates all matter, it is important to understand the process of reheating and preheating into the relevant degrees of freedom required for the success of Big Bang Nucleosynthesis. We discuss two distinct classes of models, one where inflaton and curvaton belong to the hidden sector, which are coupled to the Standard Model gauge sector very weakly. There is another class of models of inflaton and curvaton, which are embedded within Minimal Supersymmetric Standard Model (MSSM) gauge group and beyond, and whose origins lie within gauge invariant combinations of supersymmetric quarks and leptons. Their masses and couplings are all well motivated from low energy physics, therefore such models provide us with a unique opportunity that they can be verified/falsified by the CMB data and also by the future collider and non-collider based experiments. We then briefly discuss stringy origin of inflation, alternative cosmological scenarios, and bouncing universes.