Is there really such a thing as a theory of everything or are there many such theories that describe everything? In other words, do you think there is a theory which connects all of the different theories of physics such as classical mechanics, thermodynamics, statistical mechanics, classical electromagnetism, quantum mechanics, quantum electromagnetism, special relativity, quantum field theory, general relativity, the Standard model of particle physics, physical cosmology and other such theories of physics? Or in other words, do you think that there is a fundamental theory that connects all the different nonfundamental theories of physics or are there many such fundamental theories that describe all of physics?
There are scientists that have written books about this. So if you want to know if there is such a theory why not read a few of them to see for yourself if they truly are a theory of the universe that you might understand.
Some scientists think that a theory of everything could actually be string theory. http://www.livescience.com/9513-greatest-mysteries-theory.html http://www.bbc.com/earth/story/20150409-can-science-ever-explain-everything
Well, a theory is a man-made explanation of something. So, once we can explain everything, we'll have a single theory that explains everything. The universe is working, so we know it has a set of laws. If we figure out what those laws are, we will have a unified theory. The theory will surely have multiple components. A good example is the disparity between GR and QM. We don't quite know where one begins and the other ends. But we should eventually be able to quantify it, and when we do, we'll be able to reconcile one equation with the other in a single, unified equation.
