PhD Comprehensive Exam | Hyungjin Kim

Wednesday, July 10, 2019 2:00 pm - 2:00 pm EDT (GMT -04:00)

MC 6460<--break->


Hyungjin Kim | Applied Math, University of Waterloo


Addressing the Unresolved Questions of Early Universe


In this presentation, I will talk about two different methods of answering unresolved questions of our early unvierse. I will use the theory of Cuscuton to avoid the Singularity problem that the current inflationary models face. This will involve writing a model where the universe undergoes a 'bounce' instead of a phase of an accelerated expansion. Then I will talk about systematically building a tool to better understand early universe, the Effective Field Theory of Inflation. Using this tool, I will explain how higher order corrections to the Lorentzian dispersion relation arises, and will go on to show which regions in parameter space such theories are valid. I will also explain the future works needed to be done on these theories.