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Accelerated Universe from Modified Chaplygin Gas and Tachyonic Fluid
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abstract
A cosmological model with an exotic fluid is investigated. We show that the equation of state of this ``modified Chaplygin'' gas can describe the current accelerated expansion of the universe. We then reexpress it as FRW cosmological model containing a scalar field $\phi$ and find its self--interacting potential. Moreover motivated by recent works of Sen [sen1, sen2] and Padmanbhan [pad] on tachyon field theory, a map for this exotic fluid as a normal scalar field $\phi$ with Lagrangian ${\cal L}_{\phi} = \frac{\dot{\phi}^2}{2} - U (\phi)$ to the tachyonic field $T$ with Lagrangian ${\cal L}_{T} = - V(T) \sqrt{1 - \dot{T}^2}$ is obtained.
Forward citations
Cited by 3 Pith papers
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Threshold Drop in Accretion Density if Dark Energy is Accreting onto a Supermassive Black Hole
Viscous, rotating accretion of modified Chaplygin gas dark energy onto a supermassive black hole produces a threshold drop in accretion density and a stronger wind.
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Static Spherically Symmetric Chaplygin and Polytropic Fluid Solutions in Teleparallel $F(T)$ Gravity
Reconstructs F(T) models for static spherical spacetimes with Chaplygin and polytropic fluids, yielding constant-radius, compact-object, BH-like, and WH-like solution branches.
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Black holes in Einstein-Gauss-Bonnet gravity with a background of modified Chaplygin gas
The authors obtain a static 5D Einstein-Gauss-Bonnet black hole solution surrounded by modified Chaplygin gas and analyze its thermodynamics, scalar tunneling, and perturbative stability.
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