Modified Chaplygin gas in anisotropic universes on the brane

Ray, Saibal; Paul, Prasenjit; Sengupta, Rikpratik; Pant, Neeraj; Nag, Riju

doi:10.1142/s0218271821500930

Cited by 4 publications

(2 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MCG has also been found to be consistent with observational tests like gravitational lensing test [38,39] and gamma ray bursts [40]. The observational constraints on MCG have also been studied in some detail [41][42][43][44][45][46]. In a recent work, Benaoum et al [47] have constructed some modified class of MCG models using geometrothermodynamics those show internal thermodynamic interactions.…”

Section: Introductionmentioning

confidence: 76%

Anisotropic Universes Sourced by Modified Chaplygin Gas

Ray,

Tripathy,

Sengupta

et al. 2023

Universe

Self Cite

View full text Add to dashboard Cite

In this work, we perform a comparative study of the Kantowski–Sachs (KS) and Bianchi-I anisotropic universes with Modified Chaplygin gas (MCG) as matter source. We obtain the volume and scale factors as solutions to the Einstein Field Equations (EFEs) for the anisotropic universes, and check whether the initial anisotropy is washed out or not for different values of the MCG parameters present in the solution by obtaining the anisotropy parameters for each solution. The deceleration parameter is also obtained for each solution, the significance of which is discussed in the concluding section. Interestingly there are a number of notable results that appear from our study which help us to compare and contrast the two different anisotropic models along with proper understanding of the role of MCG as matter source in these models.

show abstract

Section: Introductionmentioning

confidence: 76%

Anisotropic Universes Sourced by Modified Chaplygin Gas

Ray,

Tripathy,

Sengupta

et al. 2023

Universe

Self Cite

View full text Add to dashboard Cite

show abstract

“…Their first model consisted of two parallel braneworlds, but in the second model [19] the brane with a negative tension was moved to infinity. The RS single brane model has a spacelike extra dimension and finds wide range of application in both cosmology [26][27][28][29][30][31][32][33][34] and astrophysics [35][36][37][38][39][40][41][42][43][44]. Soon after, a dual to the RS-II single brane model was proposed by Shtanov and Sahni (SS), with a timelike extra dimension replacing…”

Section: Introductionmentioning

confidence: 99%

Traversable Lorentzian wormhole on the Shtanov-Sahni braneworld with matter obeying the energy conditions

Sengupta,

Ghosh,

Kalam

2023

J. Cosmol. Astropart. Phys.

Self Cite

View full text Add to dashboard Cite

In this paper we have explored the possibility of constructing a traversable wormhole on the Shtanov-Sahni braneworld with a timelike extra dimension. We find that the Weyl curvature singularity at the throat of the wormhole can be removed with physical matter satisfying the NEC ρ + p ≥ 0, even in the absence of any effective Λ-term or any type of charge source on the brane. (The NEC is however violated by the effective matter description on the brane arising due to effects of higher dimensional gravity.) Besides satisfying NEC the matter constituting the wormhole also satisfies the Strong Energy Condition (SEC), ρ + 3p ≥ 0, leading to the interesting possibility that normal matter on the brane may be harnessed into a wormhole. Incidentally, these conditions also need to be satisfied to realize a non-singular bounce and cyclic cosmology on the brane [1] where both past and future singularities can be averted. Thus, such a cyclic universe on the brane, constituted of normal matter can naturally contain wormholes. The wormhole shape function on the brane with a time-like extra dimension represents the tubular structure of the wormhole spreading out at large radial distances much better than in wormholes constructed in a braneworld with a spacelike extra dimension and have considerably lower mass resulting in minimization of the amount of matter required to construct a wormhole. Wormholes in the Shtanov-Sahni (SS) braneworld also have sufficiently low tidal forces, facilitating traversability. Additionally they are found to be stable and exhibit a repulsive geometry. We are left with the intriguing possibility that both types of curvature singularity can be resolved with the SS model, which we discuss at the end of the concluding section.

show abstract