The question is loaded and really doesn't fit into the space for questions.
My theory proposes a candidate for Dark Matter. The candidate would be antimatter traveling in a Lagging Hypersphere ( a true parallel Universe made of antimatter).
HU allows for the derivation of asymmetric Gravitational attraction. It is conceivable that in early epochs, when the LH were more dense, antimatter Black Holes or Stars could align themselves with matter stars in this Hypersphere. After reaching a critical mass, tunneling could elicit annihilation and a Gamma Ray Burst.
This mechanism would be consistent with the full conversion of a Star mass into gamma rays as it is observed in GMB.
Antimatter in a LH is also consistent with Gravitational Lensing in regions where matter is not visible.
A subtle but important aspect of my theory is that those hyperspheres are traveling at the speed of light along a radial direction.
https://www.youtube.com/watch?v=r54AQc2BR5c&t=2s
https://issuu.com/marcopereira11/docs/huarticle