Dark energy and its manifestations |
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| Institution: | 1. ICFAI University Tripura, Kamalghat, Tripura Mohanpur-799210, India;2. Department of Mathematics, BITS Pilani K K Birla, Goa Campus, Goa 403726, India;1. Department of Mathematics, Sri Aurobindo College, University of Delhi, Malviya Nagar, New Delhi, Delhi 110017, India;2. Department of Mathematics, ARSD College, University of Delhi, Dhaula Kuan, Delhi 110021, India;3. Department of Mathematics, Deshbandhu College, University of Delhi, Kalkaji, New Delhi, Delhi 110019, India;1. Department of Astronomy & Space Sciences, Faculty of Science, Ege University, 35100 Bornova, İzmir, Turkey;2. Department of Physics, University of Zagreb, Bijenicka cesta 32, 10000 Zagreb, Croatia;3. Department of Astronomy & Space Sciences, Erciyes University, Kayseri, Turkey;4. Department of Astronomy & Space Sciences, Graduate School of Science and Engineering, Istanbul University, 34116, Beyazt, Istanbul, Turkey;1. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, Brno 611 37, Czechia;2. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V. (BAV), Berlin, Germany;3. American Association of Variable Star Observers (AAVSO), Cambridge, USA;4. Institute for Astrophysics, University of Vienna, Türkenschanzstrasse 17, Vienna 1180, Austria;5. Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica 059 60, Slovakia;6. Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnii Arkhyz 369167, Russia;1. Department of Physics and Astronomy, Shumen University, Shumen 9700, Bulgaria;2. Institute of Astronomy and NAO, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd., Sofia 1784, Bulgaria |
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| Abstract: | In a four dimensional manifold formalism we study the evolutionary behavior as well as the ultimate fate of the universe, in the course of which the contribution of dark energy in these phases are investigated. At one stage we get a situation (a condition) where the dark energy contained dominates other types of energies available in this universe. In the model universes we obtain here the dark energy is found to be of ΛCDM and quintessence types-which bear testimony to being real universes. In one of the cases where the equation of state between the fluid pressure and density is of the type of the van der Waals equation, it is found that our universe may end in dust. And, also, it is seen that the behavior of the deceleration parameter is almost compatible with the recent observation. |
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