4 ms·
Yes, given the equations of GR, there's no particular reason to assume that the cosmological constant should be zero. (Though one of the major problems in theo
by antognini 2y ago
Yes, given the equations of GR, there's no particular reason to assume that the cosmological constant should be zero. (Though one of the major problems in theoretical physics is that back-of-the-envelope estimates as to what it "should" be give numbers that are ~120 orders of magnitude larger than its observed value. So if dark energy is a cosmological constant, it's not really understood why it is non-zero, but extremely small.)
- SoftTalker 2y agoIsn't that why they came up with "dark matter" i.e. invisible, undetectable mass.
- antognini 2y agoNo, dark matter is quite different. There are a number of different lines of evidence for dark matter. One of these is sort of similar to dark energy, in that it is needed to explain the slower-than-expected expansion of the universe at early times. But the most compelling line of evidence for dark matter (IMO) is baryon acoustic oscillations in the CMB.