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Department of Physics

Cosmology & Particle Astrophysics


Bharat Ratra, distinguished professor of physics, works in the areas of cosmology and astroparticle physics. He researches the structure and evolution of the universe. Two of his current principal interests are developing models for the large-scale matter and radiation distributions in the universe and testing these models by comparing predictions to observational data. Do you wonder how and why the universe started expanding? And whether this expansion is speeding up or slowing down? And how the very large-scale properties of the universe are related to the very small-scale properties of subatomic scale matter? The K-State cosmology group studies all these issues and more.

Lado Samushia, assistant professor, conducts physics research in the area of cosmology. His research lies in using 3-D maps of galaxy distribution from current spectroscopic galaxy surveys to study the properties of dark energy. These large data sets also can be used to study properties of gravitational interactions and check whether Einstein's General Relativity is a correct theory of gravity. Samushia and his collaborators form the Sloan Digital Sky Survey collaboration have used the most recent data set to measure the distances to remote galaxies with better than 1 percent precision and to measure the expansion rate of the universe with a 4 percent precision.

Samushia also is involved with the Euclid satellite mission and Dark Energy Spectroscopic Instrument experiment, both scheduled to start by 2020, and the WFIRST satellite mission.

For more details about the K-State Cosmology & Particle Astrophysics research program, visit the individual pages listed on the side menu.