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Phenomenological Varying Modified Chaplygin Gas with Variable G and Λ: Toy Models for Our Universe

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Abstract

In this paper, we have considered varying modified Chaplygin gas in case of variable G and Λ. Since varying G and Λ give rises to modified form of field equations and conservation law, we have considered two different toy models. In the first model, the Universe is filled with a phenomenological gas while in the second one, there is the existence of gas and a matter with P = ω(t)ρ m . By considering sign changeable interaction between fluids we have analyzed important cosmological parameters such as EoS parameter of the fluids and deceleration parameter q of the models.

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Correspondence to H. Farahani.

Appendices

Appendix: Single Component Fluid Universe

Fig. 8
figure 8

Scale factor of single component fluid Universe

Fig. 9
figure 9

EoS parameter of single component fluid Universe

Fig. 10
figure 10

Energy density of single component fluid Universe

Appendix: Two Components Fluid Universe

Fig. 11
figure 11

Scale factor of two component fluid Universe

Fig. 12
figure 12

EoS parameter of two component fluid Universe

Fig. 13
figure 13

EoS parameter of two component fluid Universe

Fig. 14
figure 14

Energy density of two component fluid Universe

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Sadeghi, J., Khurshudyan, M. & Farahani, H. Phenomenological Varying Modified Chaplygin Gas with Variable G and Λ: Toy Models for Our Universe. Int J Theor Phys 55, 81–97 (2016). https://doi.org/10.1007/s10773-015-2635-x

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  • DOI: https://doi.org/10.1007/s10773-015-2635-x

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