Theoretical physicists in the Institute seek to complete the description of subatomic interactions and, in addition, to unite the four fundamental forces—strong, electromagnetic, weak, and gravity.

Neutrinos are among the most abundant particles in the universe and may influence how the universe evolved. Increasingly precise measurements of neutrino oscillations have revealed that neutrinos have non-zero masses, telling us that our standard model of fundamental interactions is incomplete.

Large astronomical surveys and precision cosmology measurements have dramatically altered our view of the universe, including structure formation, matter, and fundamental interactions. Increasingly sensitive observations and measurements  will further illuminate the nature of matter and our universe.