Dark matter is simply molecular hydrogen, nothing curious, look here: ESA Dark matter, anti matter are all matter, namely positron eg. a kind of matter naturally. Oooops, fabric of space? What about the fabric of an even line ??? Perhaps fabric of an even plane ?? Its ridiculous, that is the problem. Space is a non existent, man-made idea has no fabric, no structure, its NO MATTER. In Universe ONLY matter exists, no else. Matter can interact with dark energy (matter), disturbing their homogeneity. That is the fabric, not for space