Speaker
Ms
Nisha Rani
(Delhi University)
Description
In this paper, we use the approach which is independent on matter, to study the accelerated expansion of the Universe. We reconsttruct the deceleration parameter, q(z), to put constrain on the transition redshift $(z_t )$. Transition redshift is the value of redshift at which the expansion of the Universe switches from decelerated to accelerated phase. We reconstruct three different form of deceleration parameter: $q_I (z) = \frac{1}{2} +\frac{q_0}{(1+z)^2}$, $q_{II} (z) =q_1+q_2 z$, and q_{III} (z) = q_3 + q_4 log(1 + z) by using the recent data of age of galaxies and strong lensing. A joint analysis of these two datasets indicate the higher value of the transition redshift $z_t > 1$.
Author
Ms
Nisha Rani
(Delhi University)
Co-authors
Prof.
Amitabha Mukherjee
(Delhi University)
Dr
Deepak Jain
(Delhi University)
Prof.
Shobhit Mahajan
(Delhi University)
