The multiverse makes physics so cool that it is indistinguishable from self-indulgence.
Multiverse
Rob Sheldon: The quantum effects shown in large molecules may make theories like the multiverse testable
Sheldon: “By measuring a hot stream of molecules with billions of states, this experiment may rule out CSL [Continuous Spontaneous Localization]. If so, it would be the first time an interpretation of QM was actually invalidated, suggesting we have entered a new era of testing theories of the foundations of QM.”
Multiverse is science based on zero evidence, science writer complains
Baggott, of course, also feels the need to take the ritual swipe at ID. He must do so because he is allowed to criticize crackpot cosmology provided that he holds to no thesis about the nature of nature that would impede its actual advance. He can regret it but he must not undermine it.
Sabine Hossenfelder explains the problem with the “many worlds” hypothesis
Hossenfelder: In the many worlds interpretation, if you set up a detector for a measurement, then the detector will also split into several universes.
Sean Carroll: Where quantum probability comes from
His universe is deterministic, presumably, because everything happens. End of story. Actually, end of all stories.
Sean Carroll: A multiverse is the price we pay for unifying physics
Carroll: “The price we pay for such a powerful and simple unification of quantum dynamics is a large number of separate worlds.” Right. And the price you pay for suicide is that nothing you do in this world afterward matters.
Sean Carroll: Physicists don’t even want to understand quantum mechanics
Carroll wants a multiverse out of any new findings, one suspects. One question many might have is, apart from the lack of a multiverse, how bad is the current situation in physics? What, besides that, is going wrong?
At Nature: The “bizarre logic” of the multiverse is explored in a review
Crease writes as if he would very much like to buy into Carroll’s ideas but still thinks that sanity has something to offer. Possibly, many establishment science figures teeter on that brink.
What elements of fine-tuning of our universe (vs. the multiverse) would pass this test of science truth?
Ethan Siegel: Even the most successful scientific theories imaginable will, by their very nature, have a limited range of validity. But we can theorize whatever we like, and when a new theory meets the following three criteria…
The multiverse is just religion, theoretical physicist charges
Of course she’s right about the religion part. Much that is going wrong with science today is the tendency to use various science ideas as secular religions. The multiverse happens to be a particularly devastating one because it strikes at the very idea of evidence.
Yes, the Big Bang could be wrong, but what would that really mean?
Actually, multiverse cosmology would make a starting point irrelevant or else subject to endless redefinition. Powell’s bookmark-able summary can’t address the problem, of course, but that’s precisely what the multiverse does. Facts no longer matter much because contradictory facts have equal status.
Rob Sheldon: Taken seriously, the multiverse proves the existence of God
In an infinite universe, somebody somewhere has figured out how to talk from one universe to another. In an infinite universe, somebody somewhere has figured out how to talk from one universe to another.
Logic vs. the multiverse: Gunter Bechly offers some insights
For example, how can we “partition an infinite multiverse so to arrive at the finite probabilities we observe and require (e.g. for quantum mechanics) because in an infinite multiverse everything that can happen happens an infinite (with the same cardinality) number of times?”
Sabine Hossenfelder summarizes multiverse theories, asks: Science or fiction?
With respect to the simulation multiverse: Why could there not be countless, helplessly infinite, simulations of the simulations as well?
In this version of the multiverse, you are unique
But wait! There might be an infinity of multiverses in which you are not unique. This is the only one in which your head has not exploded.