My interest is General Relativity, not the math but the logic behind it. I find the subject both exciting and fascinating, the way that gravity, mass, energy, light, space and time all interact. I've written seven books on various aspects of Relativity that are all available in Kindle format on Amazon.com. If I could have met anyone from the last century, it would have been Einstein.
My interest in General Relativity is in its implications and the predictions that can be inferred from it.
I quite firmly believe that matter and antimatter gravitationally repel each other as they travel in opposite directions in time. It's not a popular belief, but it has profound implications for the way the Universe develops and it solves many of the problems with the standard model of cosmology. The jury is still out on that one but hopefully we may have the answer within the next few years.