``How did our universe begin?'' is possibly one of the oldest questions that have bewildered humans throughout history. As a theoretical cosmologist, my job is to find a mathematically consistent picture for early universe that could explain observations, from the largest to the smallest scales. The past thirty years have witnessed amazing progress, both in developing technology for precision cosmological observations, and in perfecting mathematical methodology to explain them. For example, ripples in cosmic geometry are now measured with the precision of one part in a million. We also have sophisticated mathematical frameworks such as general relativity and quantum theories that describe the origin of these ripples in early universe. However, with all of these extraordinary achievements, some old and new puzzles remain unsolved. For example we still have not resolved the most crucial puzzle about the origin of cosmos, namely the Big Bang Singularity problem. We will take a journey back in time to to explore the fascinating realm of early universe and some of its mysteries.

Bio: I obtained my BSc's degree from Physics department at Sharif university, Tehran. I received my PhD in physics from Brown University at 2005, followed by postdoctoral positions at University of Wisconsin-Madison, Perimeter Institute and University at Buffalo. I am now a faculty at Department of applied mathematics, University of Waterloo and affiliate member at Perimeter Institute. My field of research is Theoretical cosmology. I study topics such as inflationary and bouncing scenarios at universe, cosmological big bang, models of dark energy, etc