And all is generally specified by the algebraic concept of symmetry groups, as Lie and finite groups, going as the foundation for the fundamental theories of modern physics. The idea is to further unify the electroweak forces with quantum gravity forces transmitted by the massless quanta of gravitons.
Most of modern theoretical physics is about the types of symmetries of the Universe and finding the invariants (under all the symmetries) to construct field theories as its general models, like as the Standard model of CPT symmetry. It is to describe the fundamental forces and fields predicting that the exchanged particles called gauge bosons are the fundamental means by which forces are emitted and absorbed.
New Physics: From the Elemental Forces to the Prime Proto Force and Inverted Universe
In modern physics, all of the forces in the universe are based on four fundamental interactions: the strong and weak forces as nuclear forces acting at very short distances and responsible for the interactions between subatomic particles; the electromagnetic force acting between electric charges, and the gravitational force acting between masses, as the Earth-body system.
All of the forces in the universe are tended to be interrelated and united as a single super symmetrical force or supra power, one proto force. The idea of force as pervading all space and matter revolutionized Newtonian physics of classical mechanics. In 1820, Orsted made a critical discovery guided by his firm belief that chemical affinity, electricity, heat, magnetism, gravitation and light are simply manifestations of the basic forces of attraction and repulsion. The unified field theory of a single fundamental force had fully occupied Einstein for 30 years.
The weak and electromagnetic forces are already manifestations or expressions of a more fundamental electroweak interaction. A Grand Unified Theory (GUT) is to relate the electroweak interaction with the strong force of QCD.
Theories of everything are to integrate GUTs with quantum gravity theories, which include string theory, loop quantum gravity, or twistor theory, looking for a graviton or the time-space quantum properties to close the Standard Model list of force particles. Which are force carriers or messenger particles of underlying fields, such as photons mediating the interaction of electric charges, gluons mediating the interaction of color charges, hypothetical gravitons for gravitation, or virtual gauge bosons interacting with matter particles, fermions, attracting and repelling each other.