2018/08/21 by Koijam Manihar Singh, Singh, Koijam Manihar, Gauranga C. Samanta +1
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.1808.06772
openalex publication_date 2018/08/21 · openalex created_date 2022/08/04 · openalex updated_date 2026/07/28
The phenomenon of dark energy and its manifestations are studied in a\nspherically symmetric universe considering the Brans-Dicke scalar tensor\ntheory. In the first model the dark energy behaves like a phantom type and in\nsuch a universe the existence of negative time is validated with an indication\nthat our universe started its evolution before t=0. Dark energy prevalent in\nthis universe is found to be more active at times when other types of energies\nremain passive. The second model universe begins with big bang. On the other\nhand the dark energy prevalent in the third model is found to be of the\nquintessence type. Here it is seen that the dark energy triggers the big bang\nand after that much of the dark energy reduces to dark matter. One peculiarity\nin such a model is that the scalar field is prevalent eternally, it never tends\nto zero.\n