Theory of everything
Theory of everything is a predictive theory that yet not realised
Theory of everything is a theory of physics that is hope to explain all of the phenomenon of physics by a only one theory. But it is not discovered till now and it is considered as major unsolved problem in physics as well as entire science. Once a day most probably past few centuries an amazing things happened in physics world. Scientists observed that the whole physics is somehow related and a wide range of dependent two major phenomenon of physics. These two phenomenon of physics is Gravity and Quantum filed theory.
General gravity is a theoretical framework in physics that basically explains phenomenon in universe specially in large scale objects such as stars, galaxies and cluster of galaxies. On the other hand Quantum field theory focuses on the three fundamental force in universe in both small scale and low mass.
The great success of quantum field theory in universe is that it leads to developing of standard model in particle physics. The second success of Quantum field theory is unifying three non gravitational interaction, weak force, electromagnetic force and strong force.
Incompetability of general gravity and Quantum field theory
Scientists have found the incompetability of Quantum field theory and general gravity. In some case both two are not correct alltogather. The applicability of general gravity and quantum field theory is different. One is for high mass and another in extremely small scale.
For that reason a new branch of physics to research have been discovered that is quantum gravity.
After a course of action another theory have been emerged, that is string theory in order to explain all of the phemenon of universe. Scientists started to think string theory as the one of the ultimate theory of universe.
But, scientists now a days believes that string theory is not enough sufficient. They feels to discover an unique theory that will be explain all of the phenomena of universe from a single platform.