Accelerated expansion of the Universe in the presence of a static traversable wormhole, extra-dimensions and variable modified Chaplygin gas

Abstract

A modified higher-dimensional cosmology with a static traversable wormhole and dominated by a variable modified Chaplygin gas is constructed. Many interesting features are explored and discussed in some detail.A real revolution in cosmology and high energy physics concerns the recent discovery of accelerated expansion of our spatially flat matter-dominated Universe. Those observations comprise the examinations of the dynamics of galaxies (Sahni 2000(Sahni , 2002(Sahni , 2004, Type Ia supernovae (SNIa) (Riess et al. 1998) with redshift z > 0.35, the first acoustic peak of the CMB temperature fluctuations or anisotropies (Perlmutter 1999) and the recent findings of BOOMERANG experiments (de Bernardis 2000). In reality, the fact that a flat Friedmann-Robertson-Walker (FRW) model with the cosmological constant or quintessence fits best the set of astronomical observational data creates troubles of Dark Matter (DM) of about 30% and Dark Energy (DE) of about 70%. DE is in reality characterized by a negative Equation of State Parameter (EoSP): w = p/ρ < 0 with w = −1 for the case of the cosmological constant, and −1 < w < −1/3 for a quintessence fluid, whereas w < −1 for a phantom fluid. Neither the cosmological constant nor quintessence seems to solve the A.R. El-Nabulsi ( )

10-dimensional cosmology with Gauss-Bonnet gravity in generalized scalar-tensor theories from superstring theories

“…without the presence of phantom field of any kind and independent of the signature of the GB coupling parameter. There exist other specific scenarios of dark energy with striking features capable of explaining the present accelerated expansion of the universe [40,41,42,43,44,45]. The simple model described in this paper belongs to the same sort but holds some new features discussed above.…”

Charged wormholes supported by 2-fluid immiscible matter particle

“…The present observational data also suggest an exotic form of dark energy with equation of state < p ρ − , violating the weak energy condition. 36,37 This violation allows for exotic solutions of general relativity such as wormholes and warp drives and the possibility of time travel associated with them. Dark energy with = < 1 p ω ρ − , is called super-quintessence or phantom energy.…”

Accelerated expansion of an anisotropic Brans–Dicke cosmology from nonlinear derivative interaction and Gauss–Bonnet invariant

“…The additional scalar field ψmay be identified to dark matter field. Our thought is in fact based on recent study of scalar-tensor cosmology applied for dark energy description [19][20][21][22][23][24][25][26][27][28][29]. It is noteworthy that during the transition from non-phantom phase to phantom phase, the instability of the one scalar model becomes infinite at the transition point [30].…”