There is no conclusive theory.
***Same is true of high temperature superconductivity, but the skeptics don’t key up on that, do they? In addition, there is no conclusive theory of gravity. There’s the Law of Gravity, but no theory is settled -- there are several competing theories. Why does this requirement exist for cold fusion but not superconductivity nor gravity? http://www.mail-archive.com/[email protected]/msg81648.html > "There have been more than 60,000 papers published on high-temperature > superconductive material since its discovery in 1986," said Jak Chakhalian, > professor of physics at the University of Arkansas. "Unfortunately, as of > today we have **zero theoretical understanding** of the mechanism behind > this enigmatic phenomenon. In my mind, the high-temperature > superconductivity is the most important unsolved mystery of condensed > matter physics."

