What are some hot topics of physics?

Answer 1

In my view it may be NDT (non-destructive testing) and nano technology, or carbon nano-tubes to be more specific.

Answer 2

Some hot topics in physics include dark matter and dark energy, quantum computing and information, black holes and gravitational waves, and the search for a unified theory of physics (such as string theory or quantum gravity). Astrophysics and cosmology also remain exciting areas of research with ongoing discoveries.