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<p>In this paper, we investigate the evolution of dark energy parameters in the spatially homogeneous and isotropic Friedmann–Robertson–Walker model filled with barotropic fluid and dark energy in the framework of the scalar-tensor theory of gravitation formulated by Saez and Ballester (Phys Lett A 113:467, 1986). To obtain a determinate solution, we solve the field equations using the linearly varying deceleration parameter proposed by Akarsu and Dereli (Int J Theor Phys 51:612, 2012). We analyze two scenarios involving interacting and non-interacting fluids (barotropic and dark energy) and derive general results for each case. The physical implications of these findings are also discussed.</p>

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Two fluid scenario for dark energy model with LVDP in a scalar–tensor theory of gravitation

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • M. Ramanamurty,
  • R. Santhikumar,
  • K. Sobhanbabu

摘要

In this paper, we investigate the evolution of dark energy parameters in the spatially homogeneous and isotropic Friedmann–Robertson–Walker model filled with barotropic fluid and dark energy in the framework of the scalar-tensor theory of gravitation formulated by Saez and Ballester (Phys Lett A 113:467, 1986). To obtain a determinate solution, we solve the field equations using the linearly varying deceleration parameter proposed by Akarsu and Dereli (Int J Theor Phys 51:612, 2012). We analyze two scenarios involving interacting and non-interacting fluids (barotropic and dark energy) and derive general results for each case. The physical implications of these findings are also discussed.