ultradense deuterium the article has a section on ultradense deuterium this raises the same questions that have been discussed extensively on the talk page of rydberg matter this is fringe science promoted by a guy named leif holmlid who co authors papers along with cold fusion kooks such as hora and miley holmlid's papers all reference his own papers extensively but there is little evidence that anyone else in condensed matter physics believes his work three of the four references in this section are to holmlid's papers