Phantom Cosmology without Big Rip Singularity

TL;DR

This paper develops phantom energy models avoiding future singularities, explores their implications for cosmic structure disintegration, and investigates the existence of wormholes and big trip phenomena within these models.

Contribution

It introduces non-singular phantom energy models with $w<-1$, analyzing their physical consequences and theoretical features like wormholes and big trip scenarios.

Findings

Disintegration of bound structures can occur even in asymptotically de Sitter phantom universes.

Non-singular phantom models can admit wormhole solutions.

Wormholes may facilitate a big trip in these models.

Abstract

We construct phantom energy models with the equation-of-state parameter $w$ such that $w<-1$, but finite-time future singularity does not occur. Such models can be divided into two classes: (i) energy density increases with time ("phantom energy" without "Big Rip" singularity) and (ii) energy density tends to constant value with time ("cosmological constant" with asymptotically de Sitter evolution). The disintegration of bound structure is confirmed in Little Rip cosmology. Surprisingly, we find that such disintegration (on example of Sun-Earth system) may occur even in asymptotically de Sitter phantom universe consistent with observational data. We also demonstrate that non-singular phantom models admit wormhole solutions as well as possibility of big trip via wormholes.