3 ms·
This is called the MaCHO (massive compact halo object) hypothesis, and it’s pretty close to dead based on the evidence we’ve been able to collect.
by didgeoridoo 3y ago
This is called the MaCHO (massive compact halo object) hypothesis, and it’s pretty close to dead based on the evidence we’ve been able to collect.
- jquery 3y agoOnly "dead" in the sense it can't explain all the missing matter.
- bashinator 3y agoI like Occam's razor as much as anyone, but it really is starting to seem like there might be more than one cause of the phenomenon called dark matter. My understanding is that WIMPs (weakly-interacting massive particles) are in trouble too, as the LHC has failed to produce them in the expected energy regimes.
- chorsestudios 3y agoOr perhaps it is more evidence that a variant of MOND theory is responsible for our observations and there is no dark matter.
- slowmovintarget 3y agoNo current MOND theories account for the state of our observations of the Cosmic Microwave Background, or the ratios of "things" left from nucleogenesis. The biggest gotcha for MOND is there's no way to reverse the direction of gravity, which would be needed to explain large scale structures without dark matter. (With dark matter, you see things moving toward where the matter is. Absent dark matter, you see things moving away from where matter is, because there is only ordinary matter.)
- SAI_Peregrinus 3y agoMOND theories are dark matter theories. They posit explanations for the observed behaivor, that behavior is dark matter.
- bashinator 3y agoAFAIK there are plenty of observations that can't be accounted for by any MOND theory either.
- empyrrhicist 3y agoIt wouldn't have to be the main explanation for dark matter though to still be a phenomena. I agree that the evidence is pretty clear that it's not the main driving factor.
- marcosdumay 3y agoYes, and there are different levels of "close to dead" with this one being in a very much dead one... But still, every hypothesis for explaining dark matter is close to dead right now. Theoreticians reopening closed cases is a good thing.