But we primarily know him as an important quantum physicist. In
1926, he independently derived and generalized (to the case of
magnetic fields and velocity-dependent forces) the Klein-Gordon
equation, also referred to as the Klein-Fock-Gordon equation.
Because he understood that the harmonic oscillators played a
crucial role in quantum field theory, he decided to invent a
catchy name for the Hilbert space of a multi-dimensional
harmonic oscillator that represents creation and annihilation of
particles. Today, we call it the Fock space. ;-) The eigenstates
of the number operator are referred to as Fock states. In 1930,
he developed the Hartree-Fock approximation and a related
quantity, the Fock matrix, is also named after him. Einstein,
Lenin, Stalin But what I want to talk about is the relationship
between communism and general relativity. Throughout his life,
Fock was a loyal Soviet physicist. But it doesn't mean that he
always agreed with the communist majority or that he was co-
operating on the communist c