Generalized ghost dark energy in DGP model

Abstract

In 2000, Giorgi Dvali, Gregory Gabadadze and Massimo Porrati (Dvali et al. 2000) was proposed a new braneworld model named as DGP model, having two branches with (ǫ = +1) and (ǫ = −1). Former one ( ǫ = +1) known as the accelerating branch, i.e. accelerating phase of the universe can be explained without adding cosmological constant or Dark energy, whereas later one represents the decelerating branch. Here we have investigated the behavior of decelerating branch (i.e. ǫ = −1) of DGP model with Generalized Ghost Dark Energy (GGDE). Aim of our study to find a stable solution of the universe in DGP model. To find a stable solution we have studied the behavior of different cosmological parameters such as Hubble parameter, equation of state (EoS) parameter and deceleration parameter with respect to scale factor. Then we have analysed the ωD −ώD to confirm no freezing region of our present study and point out thawing region. Furthermore we have checked the gradient of stability by calculating the squared sound speed. Then we extend our study to check the viability of this model under investigation through the analysis of statefinder diagnosis parameters for the present cosmological setup.

Braneworld black holes with ModMax electrodynamics on the brane

“…This facet elucidates the observed self-accelerating nature of the Universe within the DGP brane model. This explanation underscores the sustained interest in this area, as evident in recent works [3][4][5][6][7][8]. Notably, investigations have also yielded charged black hole solutions within the DGP model [9][10][11].…”

Charged Taub-NUT-de Sitter spacetime in DGP braneworld and its thermodynamics*

“…In other words, the observed self accelerating universe is well understood in the DGP brane model. This explains the steady interest in this subject, as seen from several recent works [10][11][12][13][14][15][16]. In particular, some charged black hole solutions in the DGP model have been reported [17][18][19].…”

“…However, it is clear that the Taub-NUT solution solves constraint (11) because vacuum Einstein requires all the components of the Ricci tensor to be zero and obviously leads to the vanishing Ricci scalar. For the non-flat case with a set of constraint equations given in (12), we can employ the Kerr-Schild metric as in (13) with the replacement, that is,…”

“…( 12). Alternatively, we can directly use the ansatz for the flat case (13) to solve (12), where the result for the function is…”

Spherical collapse in DGP braneworld cosmology

“…Some of the f (R) gravity models are highly successful to explain the cosmic inflation [21,22]. On the other hand, some of the higher dimensional theories [23,24,25,26,27,28,29,30], are consistent in case of late time cosmology.…”