2008/08/31 by Andrew DeBenedictis, Remo Garattini, Francisco S. N. Lobo · 1 citation
Physics and Astronomy · #Advanced Differential Geometry Research #Cosmology and Gravitation Theories #Quantum Electrodynamics and Casimir Effect #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.78.104003
published as Phys.Rev.D78:104003,2008 · 19 pages, 13 figures. V2: Extended version of the paper accepted for publication in Physical Review D
openalex publication_date 2008/11/05 · arxiv created 2008/11/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this work, we consider time-dependent dark-energy star models, with an evolving parameter \ensuremathω crossing the phantom divide \ensuremathω=\ensuremath-1. Once in the phantom regime, the null energy condition is violated, which physically implies that the negative radial pressure exceeds the energy density. Therefore, an enormous negative pressure in the center may, in principle, imply a topology change, consequently opening up a tunnel and converting the dark-energy star into a wormhole. The criteria for this topology change are discussed and, in particular, we consider a Casimir energy approach involving quasilocal energy difference calculations that may reflect or measure the occurrence of a topology change. We denote these exotic geometries consisting of dark-energy stars (in the phantom regime) and phantom wormholes as phantom stars. The final product of this topological change, namely, phantom wormholes, have far-reaching physical and cosmological implications, as in addition to being used for interstellar shortcuts, an absurdly advanced civilization may manipulate these geometries to induce closed timelike curves, consequently violating causality.