Phantom Dark Ghost in Einstein-Cartan Gravity
arXiv:1507.07571 · doi:10.1140/epjc/s10052-017-4826-5
Abstract
A class of dynamical dark energy models is constructed through an extended version of fermion fields corresponding to phantom dark ghost spinors, which are spin one half with mass dimension one. We find that if these spinors interact with torsion fields in a homogeneous and isotropic universe, then it does not imply any future dark energy singularity or any abrupt event, though the fermion has a negative kinetic energy. In fact, the equation of state of this dark energy model will asymptotically approach the value from above without crossing the phantom divide and inducing therefore a de Sitter state. Consequently, we expect the model to be stable because no real phantom fields will be created. At late time, the torsion fields will vanish as the corresponding phantom dark ghost spinors dilute. As would be expected, intuitively, this result is unaffected by the presence of cold dark matter although the proof is not as straightforward as in general relativity.
arXiv comment10 pages, 5 figures. A heavily revised version without changes on the physical content. Version to appear in EPJC
References in corpus (36)
- The Confrontation between General Relativity and Experiment
- A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
- Phantom Energy and Cosmic Doomsday
- Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
- Dark Energy Constraints from the Cosmic Age and Supernova
- Can the dark energy equation-of-state parameter w be less than -1?
- Properties of singularities in (phantom) dark energy universe
- Inhomogeneous Equation of State of the Universe: Phantom Era, Future Singularity and Crossing the Phantom Barrier
- The final state and thermodynamics of dark energy universe
- Sudden Future Singularities
- Future of the universe in modified gravitational theories: Approaching to the finite-time future singularity
- Tachyons, Scalar Fields and Cosmology
- The future evolution and finite-time singularities in -gravity unifying the inflation and cosmic acceleration
- The Little Rip
- K-Essential Phantom Energy: Doomsday around the corner?
- Spin half fermions with mass dimension one: theory, phenomenology, and dark matter
- "Expansion" around the vacuum equation of state - sudden future singularities and asymptotic behavior
- Dark matter: A spin one half fermion field with mass dimension one?
- Nonsingular, big-bounce cosmology from spinor-torsion coupling
- Worse than a big rip?
- Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
- Dark spinor inflation -- theory primer and dynamics
- Self-interacting Elko dark matter with an axis of locality
- Axion Phantom Energy
- Dark spinor models in gravitation and cosmology
- Dark spinors with torsion in cosmology
- Spinor Dark Energy and Cosmological Coincidence Problem
- Dark energy with dark spinors
- On the generalised Chaplygin gas: worse than a big rip or quieter than a sudden singularity?
- The little sibling of the big rip singularity
- A modified theory of gravity with torsion and its applications to cosmology and particle physics
- Nonsingular Dirac particles in spacetime with torsion
- Phantom-like behaviour in dilatonic brane-world scenario with induced gravity
- Elko and mass dimension one field of spin one half: causality and Fermi statistics
- What-if inflaton is a spinor condensate?
- Causality for ELKOs