scholarly journals Conformally coupled tachyonic dark energy

2019 ◽  
Vol 100 (4) ◽  
Author(s):  
Elsa M. Teixeira ◽  
Ana Nunes ◽  
Nelson J. Nunes
Keyword(s):  
Dark Energy ◽  
Tachyonic Dark Energy

scholarly journals Metamaterial Model of Tachyonic Dark Energy

Galaxies ◽  
2014 ◽  
Vol 2 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Igor Smolyaninov
Keyword(s):  
Dark Energy ◽  
Tachyonic Dark Energy

Generalized tachyonic dark energy

2022 ◽  
Author(s):  
Elham Nouri ◽  
Hossein Motavalli ◽  
Amin Rezaei Akbarieh
Keyword(s):  
Dark Energy ◽  
Scalar Field ◽  
Matter Field ◽  
Cosmic Acceleration ◽  
Coefficient Function ◽  
Tachyon Field ◽  
Evolution Of The Universe ◽  
Coupling Parameters ◽  
Tachyonic Dark Energy ◽  
The Universe

In this paper, a generalized tachyonic dark energy scenario is presented in the framework of a homogeneous and isotropic Friedmann–Lemaître–Robertson–Walker (FLRW) flat universe, in which a noncanonical scalar field is coupled to gravity nonminimally. By utilizing the Noether symmetry method, we found the explicit form of both potential density and coupling function, as a function of the scalar field. It is found that the tachyon field acts as the source of inflation and accelerates the evolution of the universe in the early times considerably. While, in the late times, gravitational sources are a pressureless matter field together with the tachyon field, which is the nature of dark energy and plays an essential role in the deceleration-acceleration phase transition of the universe. Further, the role of the coefficient function of tachyon potential, alongside the potential, is considered in the evolution of the universe. It is shown that this model involves a cosmological degeneracy in the sense that different coupling parameters and tachyonic potentials may be equivalent to the same cosmological standards such as the cosmic acceleration, age, equation of state and mean Hubble of the FLRW universe. The physical characteristics of the main cosmological observables are studied in detail, which suggests that the generalized tachyon field is a remarkable dark energy candidate.

scholarly journals Coupled tachyonic dark energy: A dynamical analysis

2015 ◽  
Vol 24 (11) ◽  
pp. 1550085 ◽  
Author(s):  
Ricardo C. G. Landim
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Critical Points ◽  
Autonomous System ◽  
Evolution Equations ◽  
Dynamical Analysis ◽  
Tachyonic Field ◽  
Barotropic Fluids ◽  
Tachyonic Dark Energy

In this paper, we present a dynamical analysis for a coupled tachyonic dark energy with dark matter. The tachyonic field ϕ is considered in the presence of barotropic fluids (matter and radiation) and the autonomous system due to the evolution equations is studied. The three cosmological eras (radiation, matter and dark energy) are described through the critical points, for a generic potential V(ϕ).

Dark energy on firmer footing

Nature ◽  
2010 ◽  
Author(s):  
Eugenie Samuel Reich
Keyword(s):  
Dark Energy
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