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The standard model of cosmology indicates that the total mass–energy of the universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy.
Indeed. Along with how far out a freeking huge this place is yet how deep and endlessly small from our vantage. Yet there is a great chance the many will just turn, bend over and drag their knuckles as they walk back into the forest.
Knowing that can definitely change one's perspective.
originally posted by: rickymouse
Dark lives matter?
Is talking about these dark people politically correct, they may be a minority.
if dark matter has darkmatter-matter interactions
It would require a plethora of tooth fairies to imagine that the dark sector is that complicated to actually reproduce something like our sector. So in order to have dark planets and dark people and dark TV shows... people have imagined it, I'm not saying they haven't, but it certainly stretches the realm of credibility.
~ Lawrence Krauss
originally posted by: ChaoticOrder
The way I see it, physicist have forced themselves into a corner and it really shows in this doco, they provide far more questions than answers and admit at the end how their most accepted theory of dark matter is also extremely questionable, there is a reason dark matter was originally conceptualized to be so weakly interacting. The solution is most likely not to be found in WIMPs at all, personally I believe the answer lies in theories of negative mass and negative space-time, specifically the idea of inverse gravitational lensing.
originally posted by: ChaoticOrder
Also notice how at the end of the doco Krauss and several other scientists admit that it stretches the realm of plausibility because then we have to start thinking about large invisible dark matter structures. It would be fairly obvious in our observations if there were in fact large invisible masses floating around space, it would show up in the data in various ways. We just don't see any signs of large invisible object floating around our solar system or galaxy, the dark matter must have a very isotropic distribution to remain so undetectable; it doesn't clump together.
Hence Bondi pointed out that two objects of equal and opposite mass would produce a constant acceleration of the system towards the positive-mass object, an effect called "runaway motion" by William Bonnor...
Such a couple of objects would accelerate without limit (except relativistic one); however, the total mass, momentum and energy of the system would remain 0.
originally posted by: moebius
The doco might have given you a wrong impression then. Dark matter research is doing just fine. No corners far and wide, no shortage on ideas and things to test either.
Personally, I'm becoming a fan of the superfluid vacuum theory. It's mostly above my head, but I've seen quite a few illustrations as to how it is meant to unify the fundamental forces and explain certain aspects of quantum mechanics.
Also, I have a bit of a problem with Krauss. He's perfectly OK with a universe from nothingness and random particles appearing from the vacuum. This, to me, seems very against his atheist background, where everything needs to have an explanation or remained as "unexplained" or "not true".
originally posted by: moebius
originally posted by: ChaoticOrder
The way I see it, physicist have forced themselves into a corner and it really shows in this doco, they provide far more questions than answers and admit at the end how their most accepted theory of dark matter is also extremely questionable, there is a reason dark matter was originally conceptualized to be so weakly interacting. The solution is most likely not to be found in WIMPs at all, personally I believe the answer lies in theories of negative mass and negative space-time, specifically the idea of inverse gravitational lensing.
The doco might have given you a wrong impression then. Dark matter research is doing just fine. No corners far and wide, no shortage on ideas and things to test either.