scholarly journals Problems with time-varying extra dimensions or “Cardassian expansion” as alternatives to dark energy

2003 ◽  
Vol 68 (2) ◽  
Author(s):  
James M. Cline ◽  
Jérémie Vinet
Keyword(s):  
Dark Energy ◽  
Extra Dimensions ◽  
Time Varying

Extra Dimensions and Vacuum Dark Energy Models

2004 ◽  
Vol 21 (11) ◽  
pp. 2320-2322 ◽  
Author(s):  
Chen Chi-Yi ◽  
Shen You-Gen
Keyword(s):  
Dark Energy ◽  
Extra Dimensions ◽  
Energy Models

scholarly journals MATTERS ON A MOVING BRANE

2013 ◽  
Vol 22 (12) ◽  
pp. 1342024 ◽  
Author(s):  
TOMI SEBASTIAN KOIVISTO ◽  
DANIELLE ELIZABETH WILLS
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Extra Dimensions ◽  
Fifth Force ◽  
Open Strings ◽  
Visible Sector ◽  
Transverse Oscillations

A novel generalization of the Dirac–Born–Infeld string scenario is described. It is shown that matter residing on the moving brane is dark and has the so-called disformal coupling to gravity. This gives rise to cosmologies where dark matter stems from the oscillations of the open strings along the brane and the transverse oscillations result in dark energy. Furthermore, due to a new screening mechanism that conceals the fifth force from local experiments, one may even entertain the possibility that the visible sector is also moving along the extra dimensions.

scholarly journals Axially magnetized dark energy cosmological model

2019 ◽  
Vol 34 (27) ◽  
pp. 1950217 ◽  
Author(s):  
B. Mishra ◽  
Pratik P. Ray ◽  
S. K. Tripathy ◽  
Kazuharu Bamba
Keyword(s):  
Magnetic Field ◽  
General Relativity ◽  
Dark Energy ◽  
State Parameter ◽  
Substantial Effect ◽  
Anisotropic Universe ◽  
Time Varying ◽  
Big Rip ◽  
Equation Of State Parameter ◽  
The Universe

We investigate the behavior of the skewness parameters for an anisotropic universe in the framework of General Relativity. Non-interacting dark energy is considered in presence of electromagnetic field. A time-varying deceleration parameter simulated by a hybrid scale factor is considered. The dynamics of the universe is investigated in presence and absence of magnetic field. The equation of state parameter of dark energy evolves within the range predicted by the observations. Magnetic field is observed to have a substantial effect on the cosmic dynamics and the skewness parameters. The models discussed here end in a big rip and become isotropic at finite time.

Tsallis holographic dark energy in FRW universe with time varying deceleration parameter

New Astronomy ◽  
2019 ◽  
Vol 73 ◽  
pp. 101281 ◽  
Author(s):  
Archana Dixit ◽  
Umesh Kumar Sharma ◽  
Anirudh Pradhan
Keyword(s):  
Dark Energy ◽  
Deceleration Parameter ◽  
Holographic Dark Energy ◽  
Time Varying ◽  
Frw Universe
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