O.K. They held Antimatter for a part of one secound. In partical physics Antimatter is the extension of the concept of the antipartical to matter it is composed of antiparticals in the same way matter is composed of particals.
Dark matter Is inferred to exist from gravitational effects its existence is hypothical to account for decrepencies between mesaurements of mass.
Dark energy Pressure is associated with some of engergy we do not know the origins or characteristics of dark engergy.
Hawkings seems to think that at the singularity the nine demintions began, Gravitational forces lessended this made up the at least six smaller dementions. Why we see a three dementional world and why gravity is weak.
Theory is Theory hard to say if he is right or wrong his latest thing is that over time any black hole will just eat up all matter that is near it then eat its self up and just go away. I can do the math if I have years to mess with it and maybe say I think he is right but I just look at the different theorys and wait like you for the answer to come up.