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We can infer these densities just fine, subject to the assumption that the model is correct. Nobody has ever produced a measurement of dark matter density or da
by T-A 3y ago
We can infer these densities just fine, subject to the assumption that the model is correct. Nobody has ever produced a measurement of dark matter density or dark energy density, for the simple reason that nobody has ever managed to detect a single particle with the expected properties of either one (e.g. a WIMP and an inflaton, respectively).
- DiogenesKynikos 3y agoDark matter interacts gravitationally, so its density can be measured, and has been in many different environments. Weak lensing is one method of measuring dark matter density, for example.
- postalrat 3y agoDark matter can do anything we need it to do.
- DiogenesKynikos 3y agoDark matter cannot do anything one needs it to do. There are very few assumptions in the cold dark matter paradigm (you can describe them all with just a few parameters). Meanwhile, there are many different observational probes of dark matter, and they all have to agree with the predictions of the theory. There are many ways that one could seek to falsify the cold dark matter paradigm. The thing is, so far, the paradigm has passed all the tests people can think of.