Redshift, What is it really?
Me seemes the world is runne quite out of square,
From the first point of his appointed sourse,
And being once amiss growes daily wourse and wourse.
~ Edmund Spenser, The Faerie Queene Book V [1590]
In the case of modern cosmology, to paraphrase Voltaire, if there were no redshift we would need to invent one.
It is proposed by the deep thinkers in astrophysics that we can make a direct, unaltered analogy between the commonly observed Doppler shift of sound waves in air on Earth and the universally observed displacement of spectral lines of light emitted from massive sources sequestered deep in the Universe. Which would be fine, and seems to explain a lot, but keep in mind how utterly strange the Universe must be to maintain this simple analogy between sound and light. We are asked to accept: that up to 96% of the Universe is so “Dark” that we are completely unable to detect it; that quasars must be somehow unable to exist today, or nearby, which is presumably the same thing, and must be of such an energy as to stretch the bounds of physics; that quasars could not form at all somehow for the first billion years, but that galaxies and stars must have, and remain in the same distribution today, even tho they are observed to be constantly mixing and reforming; that the Universe is accelerating; that singularities exist, and the Universe itself was once one of them. Not all of these ideas have had their genesis in the cosmological redshift=distance interpretation, but many have nonetheless been described as “proving” the redshift/distance correlation, when in fact they may have no real corroborative value at all, and perfectly logical alternative explanations. For instance, perhaps the Cosmic Background Radiation looks like such an amazingly good fit for today's Universe because it is a picture of today's Universe, not some primally seeded and invarient mass/density distribution from the first microsecond of Time. Indeed, to believe that the Universe looks today just as it did 13 Billion years ago strains credulity past the breaking point. We are asked to believe that, as in the Quantum world, commonsense notions of causality must be abandoned, but is that necessary for the opposite end of the scale? Given the detailed observational refutations piling up, (see Arp's books), the severe technical limits still set upon of our probative knowledge (as opposed to proposative knowledge, in which we're up to our eyeballs), and the self-evident hubris of our grand speculative epistemologies, (many modern scientists believe we are, in the provocative words of science writer James Horgan, at the “end of science”. Helloooo?? Copernican principle ring a bell? ) why should we be so sure that there is a direct analog between electromagnetic radiation in gravity wells and pressure waves in gas?
At the very least, history teaches us that simplistic analogies for complex systems, (and what is more complex than a universe, after all?) are dangerous ground for the foundations of epistemological empires. A misunderstanding incorporated so deeply in a paradigm is extremely difficult to expose and redress. The process has taken, historically, generations, if not centuries, to work through. It begins, as always, with an unblinking observation of the facts, and the inspired vision and tireless bitching of one or more heretics. God bless the heretics!
~ Matthew P. Terry 2003 ~