Eternal inflation, energy conditions and the role of decoherent histories

TL;DR

This paper demonstrates that eternal inflation can occur without violating energy conditions by emphasizing the importance of decoherence and state selection in the inflationary process.

Contribution

It reveals that eternal inflation does not necessarily require energy condition violations, emphasizing the role of decoherence and state selection.

Findings

Eternal inflation can occur without energy condition violations.

Decoherence and state selection are crucial in the inflationary process.

Challenges previous assumptions about energy conditions in eternal inflation.

Abstract

Eternal inflation, the idea that there is always a part of the universe that is expanding exponentially, is a frequent feature of inflationary models. It has been argued that eternal inflation requires the violation of energy conditions, creating doubts for the validity of such models. We show that eternal inflation is possible without any energy condition violation, highlighting the important role of decoherence and the selection of states in the inflationary process.