Evolving Lorentzian wormholes supported by phantom matter and cosmological constant

TL;DR

This paper explores evolving wormholes sustained by phantom energy and a cosmological constant, deriving analytical models that exhibit accelerated expansion or eventual recollapse depending on the sign of the cosmological constant.

Contribution

It presents new analytical solutions for evolving wormholes supported by phantom matter with a cosmological constant, detailing their dynamic behavior and asymptotic properties.

Findings

Positive cosmological constant leads to eternally expanding wormholes.

Negative cosmological constant results in wormholes that expand then recollapse.

Wormholes are asymptotically vacuum $\Lambda$-Friedmann models with various topologies.

Abstract

In this paper we study the possibility of sustaining an evolving wormhole via exotic matter made of phantom energy in the presence of a cosmological constant. We derive analytical evolving wormhole geometries by supposing that the radial tension of the phantom matter, which is negative to the radial pressure, and the pressure measured in the tangential directions have barotropic equations of state with constant state parameters. In this case the presence of a cosmological constant ensures accelerated expansion of the wormhole configurations. More specifically, for positive cosmological constant we have wormholes which expand forever and, for negative cosmological constant we have wormholes which expand to a maximum value and then recolapse. At spatial infinity the energy density and the pressures of the anisotropic phantom matter threading the wormholes vanish; thus these evolving wormholes are asymptotically vacuum $\Lambda$-Friedmann models with either open or closed or flat topologies.