The universal wavefunction (or wave function) is a term introduced by Hugh Everett in his PhD thesis[1] The Theory of the Universal Wave Function, and forms a core concept in the relative state interpretation[2][3] or many-worlds interpretation[4][5] of quantum mechanics. It has also received more recent investigation from James Hartle and Stephen Hawking[6] in which they derive a specific solution to the Wheeler-deWitt equation to explain the initial conditions of the Big Bang cosmology.