The University of Texas at Austin, where he worked since 1969, mourned his passing away. Several students and faculty from the Physics department attended the cremation service and spoke highly of the professor and his works.
Sudarshan, an outstanding theoretical physicist, was born in Kottayam, Kerala in 1931. The professional career of Sudarshan spans five decades.
He was nominated for Nobel Prize in Physics nine times but was never awarded.
Sudarshan was awarded the Dirac Medal in 2010, which is known to be given out to scientists who have made substantial contributions in theoretical physics, computational chemistry and mathematics.
His numerous contributions to theoretical physics include the V-A Weak Interaction unification, symmetry groups in quantum field theory, the Sudarshan p representation, superluminal motion, spin and statics, quantum optical coherence, quantum Zeno effect and the infamous tachyon, the particle that moves faster than the speed of light.
A professor of physics at the University of Texas at Austin from 1969 to 2016, he made many important contributions to theoretical physics on the Indian National Science Academy (1977) and the Dirac Medal (2010).
Working with his Ph.D. advisor Robert Marshak, Sudarshan created the V-A theory of the weak force, a discovery that was crucial to the unification of the weak and electromagnetic interactions by Steven Weinberg, Abdus Salam and Sheldon Glashow, which in turn led to the 1979 Nobel Prize in Physics.
Along with Roy Glauber, Sudarshan developed a quantum mechanical description of light that would become the foundation of a new field: quantum optics. Glauber went on to share the 2005 Nobel Prize in Physics for that work.
Sudarshan and his graduate student V K Deshpande first proposed the existence of particles called tachyons that would violate Einstein's theory of relativity by travelling faster than the speed of light.
They would also have the bizarre consequence of allowing signals to be received by an observer before it was actually sent, violating the principle of causality.
So far, no experimental evidence has been found to support their existence.
Even during his tenure at the University of Texas at Austin, he continued to contribute to research and education in India, serving as a senior professor at the Center for Theoretical Studies at the Indian Institute of Sciences (1971- 1991) and director of the Institute of Mathematical Sciences in Chennai (1984-1991).
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