New Physics and Unification of Forces
The unification of fundamental forces in nature is one of the most appealing ideas for physics beyond the Standard Model of particle physics. I discuss the beautiful idea of grand unified theories where one can understand the origin of the Standard Model interactions. The experimental predictions are discussed in detail in order to understand the testability of these theories. I discuss an alternative new idea which could change the way we think about physics beyond the Standard Model. The predictions for particle physics experiments and cosmology are discussed.