The title of this piece has been a common topic for physicists to comment upon for the past few decades. I am not a physicist, but during my training to be a chemist I took a great many physics courses and have continued to be interested in developments in physics over the past 50 years or so.
Here is a list of the things I find, well, questionable.
Space-Time This invention by Albert Einstein is passing strange. On one hand, time is claimed to be an illusion or to not exist and on the other time is not only real it can be blended with spatial dimensions to make something more than real.
Cosmic Inflation and the Expansion of Space-Time Erwin Hubble discovered a key relationship regarding the spacing of celestial objects in the universe and their redshifts. All stars produce light and that light has built in patterns. When those specific patterns are shifted towards the red end of the electromagnetic spectrum, they are said to be redshifted. When shifted the other way, they are said to be blue-shifted. For example, the galaxy of Andromeda is blue-shifted, but most are redshifted. The original interpretation of these shifts were likened to the Doppler Effect, you know, the cause of train whistles sounding different when the train is moving toward you from when it is moving away. From this we jumped to the idea that the universe is expanding, an idea Einstein originally rejected. But this is not the only explanation of those shifts. In fact, Hubble recanted that analysis.
(If the redshifts are a Doppler shift) … the observations as they stand lead to the anomaly of a closed universe, curiously small and dense, and, it may be added, suspiciously young. On the other hand, if redshifts are not Doppler effects, these anomalies disappear and the region observed appears as a small, homogeneous, but insignificant portion of a universe extended indefinitely both in space and time. (E. Hubble, Roy. Astron. Soc. M. N., 17, 506, 1937)
It should be pointed out that Hubble himself was not convinced that redshift was exclusively due to Doppler effect. Up to the time of his death he maintained that velocities inferred from red shift measurements should be referred to as “apparent velocities.”
(Mitchell, 1997)
There are, in fact, quite a number of other interpretations of the data that are in play. For example, currently the shifts are assumed to be happening to the light traveling through empty space. We now know that “empty space” is an extreme condition, almost impossible to find in nature. So, what would be the effect of light traveling through space that had some dust in it? An example, would be the typically red colors of sunset. Traveling through the atmosphere at an angle, rather straight(ish) down, causes the light to be read in color. Now this strictly is not directly applicable to the galactic light, but it is analogous. There is a distance-redshift relationship because the farther light travels through space, the more distortion happens via the mechanism causing the redshifting. If the red shifting were entirely due to the Doppler Effect, the greater the effect, the faster the speed, no? So, why should galaxies be moving faster, the farther away from us they are? If all such matter originated from one point, the faster galaxies should be farther away in space and time and not farther back toward their origins. The Webb telescope is showing us light emitted by the very earliest stars/galaxies and they are heavily redshifted, more so than much closer objects. That would indicate that those galaxies were moving faster then than the galaxies are moving now, which means things are slowing down. But we are told the nonsensical thing that the “expansion of space-time is speeding up.”
To explain these things we are told that in the beginning, there was even more rapid expansion of space-time, called “Cosmic Inflation.” So, the expansion of space-time sped up to be really, really fast and then slowed down. Right.
I was taught that the more nonsense that was postulated to make a theory work, the greater likelihood that theory was on its last legs.
There is a coherent explanation for everything, if we assume the universe was infinite and not expanding. In Hubble’s words “a universe extended indefinitely both in space and time.” Have you heard much about that “other” possible interpretation of the data? No? Neither have I.
Dark Energy and Dark Matter WTF? The bulk of the matter in the universe is invisible and we never new it was there. Okay, uh. . . . And Dark Energy is a form of energy we never knew existed. It is making the universe expand faster and faster. Okay . . . WTF? How does this energy affect pace-time? Has there been a form of energy that has been determined to affect space-time? These are cockamamie concepts that were cooked up to explain new observations. Note that the old concepts were insufficient to explain the new observations, so we don’t question the old concepts or our interpretations, we just pile new whatchamacallits on top of those. Sheesh.
The Failure to Find a Unifying Theory of both Gravity and Quantum Mechanics Physicists, for the last 100 years or so, have been trying to create a theory that incorporates all of the major forces of nature. The history of physics sort of leads to this conclusion, as when forces were identified (basically the creators of new motion in matter) we were just trying to catalog them. But there turned out to be just a few of them were fundamental, those explaining all of the others. Then electric forces (attractions and repulsions) were unified with magnetic forces (attractions and repulsions). Then nuclear forces were discovered and we had a list of just four fundamental forces in nature, which explained all of the others: the weak nuclear force, the strong nuclear force, electromagnetic forces, and gravity.
But gravity wasn’t playing well. As quantum mechanics was developed, using quantum field theory, everything seems compatible, except gravity. So, the search for a theory of gravity compatible with quantum mechanics, quantum gravity if you will, went on . . . and on . . . and on.
My question centers on the fact that gravity is the force that dominates in the cosmos. Yet, for us puny humans here on earth, chemistry and physics seem to be dominated by electromagnetism and nuclear forces. And if we peered down, down, down into matter, we encountered the strange behavior of quantum-level objects. Gravity plays almost no role in biology and chemistry and quantum phenomena and only a small one in earthly physics. Quantum effects exist where we live, but they are few and far between compared with what is going on in the realm of fundamental particle interactions, which don’t show any role for gravity at that level at all.
So, what is the basis for the expectations that a theory (which is just an explanatory description of some set of physical behaviors) would apply to encompass both of these realms—the very, very, very large and the very, very, very small. The only driving force for this search is “well, it worked in the past.” Maybe, just maybe, they are separate, only slightly overlapping realms of behavior and a single theory just cannot be stretched to cover both.
String Theory An ugly baby only a mother could love is the only analogy for string theory. Maybe we need a theory for why physicists would be attracted to an untestable conjecture. (Can’t really call it a theory when it cannot be tested. Theories have passed tests, many of them.) I suspect those who dove into this quagmire early on are now thinking “Have I wasted my career studying something of no merit whatsoever?”
My background, as I have said, is in chemistry. In that subject, there seems to be a life-cycle of theories which also is apparent in early physics. When a new theory is created, there is much enthusiasm, hope and excitement. The theory is built up, tested and becomes stronger. Then flaws appear. In some theories these flaws are tiny or irrelevant and don’t undermine the use of the theory in many, many situations. Other times the flaws widen and threaten the confidence people have in that theory. At that point proponents apply patches. These tend to be context specific and apply to just those instances in which the flaw makes serious problems. But over time, such theories can accumulate a great many patches and at that time, others create new theories that require no such patches. And theories do “fade away” and cease to be used. Some get resurrected in that they produce short-lived progress in new situations, but usually that zombie-like theory will also soon fade away.
Too many of these Big Bang patches seem to deny common sense and seem to be patches to make the damned thing work like we want it to. Dark energy, dark matter, cosmic inflation, the expansion of space-time, the existence of space-time, all seem to be unsupportable reaches. Time will tell.