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Rated: 18+ · Book · Personal · #1196512
Not for the faint of art.
Complex Numbers

A complex number is expressed in the standard form a + bi, where a and b are real numbers and i is defined by i^2 = -1 (that is, i is the square root of -1). For example, 3 + 2i is a complex number.

The bi term is often referred to as an imaginary number (though this may be misleading, as it is no more "imaginary" than the symbolic abstractions we know as the "real" numbers). Thus, every complex number has a real part, a, and an imaginary part, bi.

Complex numbers are often represented on a graph known as the "complex plane," where the horizontal axis represents the infinity of real numbers, and the vertical axis represents the infinity of imaginary numbers. Thus, each complex number has a unique representation on the complex plane: some closer to real; others, more imaginary. If a = b, the number is equal parts real and imaginary.

Very simple transformations applied to numbers in the complex plane can lead to fractal structures of enormous intricacy and astonishing beauty.




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February 27, 2021 at 12:02am
February 27, 2021 at 12:02am
#1005335
As you probably know by now, sometimes I like to toss in a quantum bomb just for the fun of it.

This Twist on Schrödinger’s Cat Paradox Has Major Implications for Quantum Theory  
A laboratory demonstration of the classic “Wigner’s friend” thought experiment could overturn cherished assumptions about reality


And it's a whole lot of fun to talk about overturning "cherished assumptions about reality."

Before I get into the article, though -- and trust me, I'm not going to get too deep into it; it's there if you want to read it, but I just have a few observations to make -- a couple of quick disclaimers:

1) This stuff is way above my pay grade, but it doesn't stop me from being fascinated by it.
2) It is a Bad Idea to make general conclusions about the nature of reality from reading about quantum physics.

To give you an example of (2), consider the phenomenon of "entanglement." Entanglement is famous for appearing to violate the lightspeed limit of the universe. So SF writers, philosophers and others like to hand-wave FTL communication by using entangled particles. But the thing is, entanglement doesn't actually violate FTL limitations because there is no way, even theoretically, for it to allow the transfer of information faster than light.

You know what else violates the speed limit? Your vision. Go outside at night. Look at a star. Then look at another star. Congratulations, your vision just traveled faster than light. But so what? It's a limit on information, not observation.

Anyway, the point is, maybe I draw some of those general conclusions myself; mostly, I'm just trying to understand.

Take his fellow physicist Erwin Schrödinger’s famous thought experiment in which a cat is trapped in a box with poison that will be released if a radioactive atom decays. Radioactivity is a quantum process, so before the box is opened, the story goes, the atom has both decayed and not decayed, leaving the unfortunate cat in limbo—a so-called superposition between life and death. But does the cat experience being in superposition?

Here's the thing that always bugged me about the Schrödinger’s Cat "experiment." Well... apart from the cavalier disregard for a poor kitty's life; fortunately, it was only a thought experiment and, as far as I know, no one has attempted it in a laboratory. The other thing that bugs me is this: If, as the theory suggests, it takes an observer to collapse the wave function and determine "alive" or "dead," how do we define "observer?" I mean, other people have asked this quesiton, too, but I'm talking about it here anyway.

What I mean is, are we really going to assert that it requires a human consciousness? Because I know cats, and I can tell you that cats are conscious animals. They probably don't understand quantum mechanics, and they probably don't have our obsession with questions of the meaning of existence or of life and death, but the cat in Schrödinger’s box would "know" whether it is alive or dead (well, if dead, it wouldn't know anything because it's dead, but you get my point). To further clarify this, replace, in the thought experiment, a cat with a human. Does it really matter if an outside observer doesn't see the result? Because the person in the box does.

So, the article gets into this and even marries the cat-in-the-box thing with quantum entanglement, and like I said, I don't pretend to understand all of it. And it further describes several competing interpretations, or ways to understand what's "actually" going on.

It's easy to draw mystical conclusions from this, and quacks have done so. "Look, science says that nothing really exists until we see it, so we can manipulate reality by choosing what to see" or some such dreck. No. That's not how it works. I don't know how it works, but that's not it.

I'm also still not entirely convinced by many-worlds interpretations -- the article describes this too, but in brief, the idea is that any quantum event that can have more than one outcome (which as I understand it is all of them) produces every possible outcome, each splitting off its own universe. This may fit the data, according to physicists, but there are other possible explanations and, well, that just seems like exactly what Occam's Razor is for: "entities should not be multiplied unnecessarily."

It is, though, great fodder for science fiction. However, some writers have interpreted this to mean "every decision we make splits off new universes," but I'm also not convinced that we actually make decisions; rather, we do what we must, and make up stories about it afterward.

So yeah, I'm not quoting any more of the article. It's there if you want to read it. I just wanted to add my own thoughts.


© Copyright 2024 Robert Waltz (UN: cathartes02 at Writing.Com). All rights reserved.
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