BB #74: Which MWI?

I finished The Quantum Labyrinth: How Richard Feynman and John Wheeler Revolutionized Time and Reality (2017), by Paul Halpern. As the title implies, the book revolves around the careers and lives of John A. Wheeler (1911–2008) and Richard Feynman (1918–1988). After Feynman graduated from MIT he became Wheeler’s teaching assistant at Princeton. The two men, despite very different personalities, became life-long friends and collaborators.

One of Wheeler’s many claims to fame is his promotion of Hugh Everett’s PhD thesis, The Theory of the Universal Wave Function. That paper, of course, is the seed from which grew the Many Worlds Interpretation of Quantum Mechanics.

The thing is, there are two major versions of the MWI.

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Octavia E. Butler

Retirement, along with online access to the library, has opened the door to exploring authors I’ve meant to read for ages. For example, I’d always meant to read one of my dad’s favorite books, The Name of the Rose (1980) by Umberto Eco, but it wasn’t until last year that I finally did (and it was really good; I can see why he loved it).

As a fan of literary science fiction for over six decades, I’ve long felt pressure to explore the works of Octavia Butler (1947–2006). Over the years, in collections, I’ve read some of her short stories (and found them tasty). It was only in the last month or so that I finally got into her novels.

And, my, oh my! She is every bit as good as everyone says she is.

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BB #73: Wavefunction Collapse

I’m two-thirds through my second Paul Halpern book this month. Earlier I read his book about cosmology, Edge of the Universe: A Voyage to the Cosmic Horizon and Beyond (2012), which was okay. Now I’m reading The Quantum Labyrinth: How Richard Feynman and John Wheeler Revolutionized Time and Reality (2017), which I’m enjoying a bit more. In part because cosmology has changed more since 2012 than quantum physics has since 2017. (Arguably, the latter hasn’t changed much since the 1960s.)

I wrote about Halpern’s book, Einstein’s Dice and Schrödinger’s Cat (2015), last year. As the title implies, it focuses on two great names from physics. Quantum Labyrinth (as its title also implies) also focuses on two great physics names.

But today’s Brain Bubble (as the title implies) is about wavefunction collapse.

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Babylon (Anime)

History, location, and religion aside, the Wikipedia disambiguation page for “Babylon has 52 entries under “Arts and entertainment” — 26 of which are songs (including one by David Gray that I rather like). Two entries, a novel series and an anime series (which I binged last night), link to the same page because they refer to the same very interesting (very dark) story.

By interesting (and dark) I mean it’s about good, evil, and whether the right to suicide is a good thing. The battles here are mainly intellectual and spiritual. A key point for the characters is the question: what is good; what is evil?

I also recently watched Jupiter’s Legacy on Netflix (Meh!), and I want to offer props to the most recent episode of Grown-ish, which I thought was compelling, well-done, and worth seeing.

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Sideband #73: Complex 4D

I’ve written a number of posts about four-dimensional Euclidean space, usually in the context of one of my favorite geometrical objects, the tesseract. I’ve also mentioned 4D Euclidean spaces as just one of many possible multi-dimensional parameter spaces. In both cases, the familiar 2D and 3D spaces generalize to additional dimensions.

This post explores a specialized 4D space that uses complex numbers along each axis of a 2D nominally Euclidean space. Each X & Y coordinate has two degrees of freedom, a magnitude and a phase. This doesn’t make 4D spaces easier to visualize, but it can offer a useful way to think about them.

It also connects back to something I wrote about in my QM-101 series.

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Follower Purge!

“Danger, Will Robinson, Danger!”

Attention All Readers: Later this month (or maybe even sometime next) I’m doing a purge of Followers that, as far as I can tell, have never been seen since they followed this blog.

I’m keeping anyone I recognize from recent or past conversations (or repeat Likes), either on this blog or elsewhere. (Obviously I’ll keep my lurking IRL friends; y’all are safe from the Purging Angel.)

Point is, if you’ve been silently lurking, and don’t want to get purged, now would be a good time to make your presence known!


The Art of Debate

The primary inspiration for this post, which I’ve been meaning to write since I started this blog, is a 1995 webpage titled The Art of Conversation. In fact, as I’ve done with this post, it could be called The Art of Debate, since debate over a topic — a dialectic — is what drives these (in fact ancient) ideas about discourse and rhetoric.

The page’s authors (Dean & Marshall VanDruff) give it other names: Conversational Cheap Shots! (on the site’s main page link) and Conversational Terrorism (on the page itself). The graphic, which I’ve shamelessly recreated here, calls it How Not To Talk.

Regardless, it’s about how to have an honest effective debate that actually goes somewhere. (Be that concordance or disagreement.)

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Friday Notes (Jul 16, 2021)

It’s finally a Friday which means there’s a probability of weather occurring as well as lesser probability of another Friday Notes post. A quick roll of my free-will dice, and it turns out today I’ve got both weather and a post. (Because I have notes. There are always notes.)

In this bundle I’ve got a “so this just happened” rant, a scam warning, a funny story about people, a question, and a couple of callbacks to a couple of favorite previous topics. I might toss in a few other items once I get going and if space permits.

Because I have notes. There are always notes.

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MWI: Questions, part 3

This is the third part of a series examining the Many Worlds Interpretation of Quantum Mechanics (the MWI of QM). The popularity of the MWI in books, blogs, and science videos, especially among the science-minded, tends to keep in present in some corner of my mind. Blog posts are a way to shoo it out.

The first part introduced the topic and talked about cats. The second part discussed the Schrödinger equation, wavefunctions, decoherence, and the question of how multiple instances of matter can coincide. That question, to me, is a central issue I have with MWI.

This time I dig into quantum superposition and touch on a few other topics.

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MWI: Questions, part 2

Last time I started exploring questions I have about the Many Worlds Interpretation of Quantum Mechanics (the MWI of QM). Obviously I’m not a fan; quite the opposite. It presents as parsimonious, hung on the single hook of a universal wavefunction, but I think it gets more complicated and cumbersome when examined. I can’t say it’s broken, but I don’t find it very attractive.

I suspect most people, even in physics, don’t care. A few have invested themselves in books or papers, but these interpretations don’t matter to real physics work. The math is the math. But among the philosophical, especially the ontological, it’s food for debate.

Being both philosophical and ontological, I do smell what’s cooking!

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