NONLINEAR EQUATION OF STATE, COSMIC ACCELERATION AND DECELERATION DURING PHANTOM DOMINANCE
نویسندگان
چکیده
منابع مشابه
Inhomogeneous Equation of State,cosmic Acceleration and Deceleration during Phantom-dominance
Taking inhomogeneous equation of state for phantom fluid in RS-II model, it is shown that universe decelerates also after acceleration in certain cases. This is in contrast to earlier results of phantom universe exhibiting acceleration only.
متن کامل1 4 Ju l 2 00 8 NON - LINEAR EQUATION OF STATE , COSMIC ACCELERATION AND DECELERATION DURING PHANTOM - DOMINANCE
Here, RS-II model of brane-gravity is considered for phantom universe using non-linear equation of state. Phantom fluid is known to violate the weak energy condition. In this paper, it is found that this characteristic of phantom energy is affected drastically by the negative brane-tension λ of the RS-II model. It is interesting to see that upto a certain value of energy density ρ satisfying ρ/...
متن کاملScale Factor Dependent Equation of State for Curvature Inspired Dark Energy, Phantom Barrier and Late Cosmic Acceleration
Here, it is found that dark energy and dark matter emerge from the gravitational sector, if non-linear term of scalar curvature is added to Einstein-Hilbert lagrangian. An equation of state for dark energy, having the form pde = −ρde + f(a) (with pde(ρde) being the pressure (density) for dark energy, f(a) being a function of scale factor a(t) and t being the cosmic time) is explored. Interestin...
متن کاملSpeed perception during acceleration and deceleration.
We have recently shown that stimulus acceleration affects subsequent preferred speed and tuning widths of macaque area MT neurons (A. Schlack, B. Krekelberg, & T. D. Albright, 2007). Given the close link between area MT and speed perception, this predicts that speed perception should depend on the acceleration context. Here, we show that this is indeed the case for both speed discrimination and...
متن کاملCosmic ray acceleration and nonlinear relativistic wavefronts
The usual Fermi processes are not efficient enough to account for the high energy cosmic ray acceleration in AGNs, Jet hot spots, GRBs, and in other compact object environments. It is proposed to accelerate particles by large perturbations in the relativistic plasmas of compact object environments where the Alfvén velocity is close to the velocity of light. Relativistic wavefronts are far more ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Modern Physics D
سال: 2009
ISSN: 0218-2718,1793-6594
DOI: 10.1142/s0218271809014443