What "caused" the low entropy state at the beginning of our universe?

Question

What "caused" the low entropy state at the beginning of our universe?

Answer 1

No one knows...The June 2008 Scientific American has an excellent article on time and its relationship to positive entropy in the universe.  One of the things it stresses is that no one knows why our universe was born with low entropy (high enthalpy).

There are lots of theories of course...or maybe we should call them hypotheses (WAGs) because no one has come up with a way to test them.  One theory is that two or more parallel null universes collided to release that enthalpic energy through a sudden change in momenta.  A null universe exists without mass or energy in our four dimensional reference frame.

Another theory is that the fabric of null space ripped and released all that energy.  The fabric of space may consist of infinitely thin vibrating strings of Planck length (10^-33 cm).  Each string has about 1 KW of power embedded in it.  In the multiverse frame, universes like ours would be popping into existance like bubbles in a soda all the time throughout null space. [See source.]

The Big Bang Theory is consistent with either energy source theory.  [See source.]