11.30 am,Lecture Hall 804
What if photon has a mass?
T R Govindarajan
Chennai Mathematical Institute.
28-08-19

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Abstract

We consider photon to be massless. This plays a crucial role in QED and also creates problems of divergences at infrared. This is resolved by proper handling of asymptotic properties. It can also be understood by giving a tiny mass to the photon. We study what will happen if there is an extremely small mass for the photon. We revisit this question posed by Schrodinger about 60 years back with current understanding in cosmology. Specifically, we ask the question whether it can help in providing an ultra-light dark matter candidate also known as fuzzy dark matter. Speculation is carried further in new areas. (be ready for surprises!!)