Starts 20 Dec 2018 14:30
Ends 20 Dec 2018 16:00
Central European Time
Leonardo Building - Euler Lecture Hall
Abstract. The mysterious component called "dark energy", which comprises almost 70% of the current energy budget of the universe, is believed to be responsible for the observed cosmic acceleration at the present epoch. Interestingly, many of the recent observations predict that the properties of dark energy are consistent with the concordance cosmological model (LCDM), based on the Einstein's general theory of relativity and characterised by a constant energy density of the dark energy. But the LCDM model is plagued by quite a few theoretical and observational issues. Therefore, the importance of looking for the alternatives to the general relativity for explaining the cosmic acceleration, consistent with the observations, cannot be overstated. The talk will be focused on the following two compelling models of evolving dark energy. (i) New tracker models of dark energy: we introduced a new class of quintessence driven dark energy models which behave like cosmological trackers at early times and are consistent with the observed late-time accelerated expansion of the universe. These models are based on the α-attractor set of potentials, originally discussed in the context of inflation. (ii) Braneworld models of dark energy: the presence of a large extra dimension in the braneworld models can result in late-time accelerated expansion that is consistent with the observation. I will discuss some attractive features and the advantages of these models, and how well they match the current observations.