Nonsingular Phantom Cosmology in Five-Dimensional f(R, T) Gravity
Abstract
:1. Introduction
2. Modified Einstein Field Equations
3. Solutions to the Field Equations
3.1.
3.2.
3.3.
4. Some Physical and Geometrical Properties
4.1. Status of the Model
4.2. Stability of the Model
4.3. EOS Parameter
5. Discussion and Conclusions
- (1)
- We notice that the model is free from the initial singularity and, hence, physically viable. This feature is obvious, as for , we obtain , and for , one can obtain .
- (2)
- The cosmic distribution has a finite fluid pressure and matter density at . The physical quantities decrease as increases and tend to zero when . Thus, our presented model leads to a vacuum cosmological solution at infinite time.
- (3)
- As , so the model is anisotropic throughout the evolution. Again, exhibits the expanding universe. However, dictates that the universe is decelerating.
- (4)
- The stability of the model is obtained by considering the ratio , which is positive for , to yield a stable model.
- (5)
- The EOS parameter is governed by the parameter , and its value can be found as . This is related to , which behaves like a phantom-energy-inspired cosmology. This type of phantom cosmology allows us to account for the dynamics and matter content of the universe, tracing back the evolution to the inflationary epoch [74]. In this connection, we would also like to point out that while the dependence of is explicit across all cases, this is not overall true, as this situation is solely visible in the results from Case 3.1. One can note that Case 3.3 shows a clear time dependence (and therefore, very dependent on the magnitude of ).
- (6)
- The anisotropic/isotropic behavior of the models for different choices of the parameters are given in Table 1 in connection with Case 3.2.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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For Case 3.2 | , | , | , | , |
---|---|---|---|---|
V | expanding | expanding | decreasing | constant |
decreasing | decreasing | negative | 0 | |
q | 3 | 3 | 3 | undefined |
z | decreasing | decreasing | increasing | 0 |
0 | undefined |
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Sahoo, R.R.; Mahanta, K.L.; Ray, S. Nonsingular Phantom Cosmology in Five-Dimensional f(R, T) Gravity. Universe 2022, 8, 573. https://doi.org/10.3390/universe8110573
Sahoo RR, Mahanta KL, Ray S. Nonsingular Phantom Cosmology in Five-Dimensional f(R, T) Gravity. Universe. 2022; 8(11):573. https://doi.org/10.3390/universe8110573
Chicago/Turabian StyleSahoo, Rakesh Ranjan, Kamal Lochan Mahanta, and Saibal Ray. 2022. "Nonsingular Phantom Cosmology in Five-Dimensional f(R, T) Gravity" Universe 8, no. 11: 573. https://doi.org/10.3390/universe8110573