Instead of WIMPS or axions, dark matter may be made of macroscopic objects as small as a few ounces up to the size of a good asteroid, and probably as dense as a neutron star or the nucleus of an atom, researchers suggest.
Well, if the standard model accounts for dark matter, isn’t that a reason to stick with it, instead of jumping ship to a multiverse?
The limits of the possible dark matter are as follows:
A minimum of 55 grams. If dark matter were smaller, it would have been seen in detectors in Skylab or in tracks found in sheets of mica.
In the range of 109 to 1018, dark matter would collide with Earth once annually, providing nothing to the underground dark matter detectors in place.
A maximum of 1024 (a million billion billion) grams. Above this, the Macros would be so massive they would bend starlight, which has not been seen.
The range of 1017 to 1020 grams per centimeter squared should also be eliminated from the search, the theorists say. Dark matter in that range would be massive for gravitational lensing to affect individual photons from gamma ray bursts in ways that have not been seen.
If dark matter is within this allowed range, there are reasons it hasn’t been seen.
At the mass of 1018 grams, dark matter Macros would hit Earth about once every billion years.
At lower masses, they would strike Earth more frequently but might not leave a recognizable record or observable mark.
See also: Multiverse cosmology: Assuming that evidence still matters, what does it say?
See also: In search of a road to reality
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