Mr. Sean Carroll is a physicist at the Caltech. His research includes the theoretical physics and astrophysics, especially the cosmology, field theory, and gravitation. He has published several research papers dark matter and dark energy, modified gravity, violations of Lorentz invariance, extra dimensions, topological defects, and cosmic microwave background anisotropies.
He has also published
several researchers on causality violation, black holes, and the cosmological
constant problem. He is currently focused on origin of the universe and the
arrow of time, including the roles of inflation, baby universes, and quantum
gravity.
In his recent video by
Techinsider, he explains what existed before Big Bang and it actually means. So
watch and learn: