So basically the LCMD model is broken, and the only way to fix it is to tinker with the properties of one or more of it's metaphysical components and/or add another one (sterile neutrinos).One way to bridge the divide is to invoke new phenomena in physics.
There are various ways to account for it, including the addition of a new particle, called a sterile neutrino, to the Standard Model - the best tested theory of particle physics.
The sterile neutrino would represent the fourth type - or flavour - of neutrino; but while the other three are well known to physicists, attempts to detect a fourth with experiments have not come up with much.
Another possibility is that dark energy behaves in a different way now compared with how it did in the early history of the cosmos.
"One promising way is if we don't have dark matter be so perfectly 'collision-less' but it could interact with radiation in the early Universe," Prof Riess said.
He has submitted a paper with his latest analysis of the Hubble Constant for publication in a journal.
When is enough enough anyway? LCDM hasn't ever correctly "predicted" anything. It's all been a postdicted fit to some observation or another and it's track record in the lab is utterly atrocious. ICE Cube just completed a major search of sterile neutrinos and found nothing, so why would they even consider it? The can't even tell if the 'fix' should occur by adding a new exotic particle, tinkering with dark energy, or futzing with the metaphysical properties of exotic forms of matter that have failed every test to date in the lab.
The rationalizations for keeping LCDM alive in the 21st century are getting weirder and weirder by the year. When the Webb Telescope starts returning images, they need to tweak the metaphysics again too.
LCDM is the biggest disaster in the history of physics. It's worse than the whole epicycle fiasco because they blow billions of dollars on 'tests', that all fail, and yet the metaphysical dogma continues unabated.
LCDM is a really dead horse. Bury that poor thing already.