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Abstract: In standard cosmology, with the evolution of the universe, the matter densityand thermodynamic pressure gradually decreases. Also in course of evolution,the matter in the universe obeys or violates some restrictions or energyconditions. If the matter distribution obeys strong energy condition SEC, theuniverse is in a decelerating phase while violation of SEC indicates anaccelerated expansion of the universe. In the period of accelerated expansionthe matter may be either of quintessence nature or of phantom nature dependingon the fulfilment of the weak energy condition WEC or violation of it. Asrecent observational evidences demand that the universe is going through anaccelerated expansion so mater should be either quintessence or phantom innature. In the present work we study the evolution of the universe through thephantom barrier i.e. the dividing line between the quintessence and phantomera and examine how apparent and event horizon change across the barrier.Finally, we investigate the possibility of occurrence of any singularity inphantom era.



Author: Subenoy Chakraborty, Nairwita Mazumder, Ritabrata Biswas

Source: https://arxiv.org/







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