ABSTRACT
This chapter discusses gravitation in all its aspects. The fundamental law of gravitation was discovered by Newton, that gravitational forces are proportional to masses and that they follow an inverse-square law. The usual course in gravitation therefore starts by stating the laws just as Albert Einstein did. Einstein's gravitational theory, which is said to be the greatest single achievement of theoretical physics, resulted in beautiful relations connecting gravitational phenomena with the geometry of space; this was an exciting idea. The traditional description of the total quantum mechanics of the world by a complete Monster Wavefunction obeying a Schrödinger equation. Another spectacular coincidence relating the gravitational constant to the size of the universe comes in considering the total energy. The chapter considers whether gravitational forces might not come from the virtual exchange of a particle which is already known, such as the neutrino.
