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Feb 4, 2026
Location: SB 156
Time: 12:00 pm
Presenter: Bharat Ratra
The “Standard” Model of Cosmology … and Open Questions
Abstract: Experiments and observations over the last two and half decades have provided strong support for a “standard” model of cosmology that describes the evolution of the universe from an early epoch of inflation to the complex hierarchy of structure seen today. I review the basic physics, astronomy, and history of ideas, on which this model is based. I describe the data which persuade cosmologists that (as yet not directly detected) dark energy and dark matter are by far the main components of the energy budget of the universe. I conclude with a list of open cosmological questions.
Bharat Ratra is a Distinguished Professor of Physics known for pioneering work in cosmology and astroparticle physics. He co-developed the first dynamical dark energy model, a breakthrough that might help explain the universe’s accelerating expansion, which is one of the most significant discoveries in modern science. Dr. Ratra has published extensively, delivered invited talks worldwide, and mentored the next generation of physicists. His research has earned him over $14 million in funding and numerous honors, including fellowships in major scientific societies and the 2025 APS Julius Edgar Lilienfeld Prize.
Light Lunch will be served.