Vincent: Want to talk about MOND?

Jules: No man, I don’t consider MOND.

Vincent: Are you biased?

Jules: Nah, I ain’t biased, I just don’t dig MOND, that’s all.

Vincent: Why not?

Jules: MOND is an ugly theory. I don’t consider ugly theories.

Vincent: MOND makes predictions that come true. Fits galaxy data gooood.

Jules: Hey, MOND may fit every galaxy in the universe, but I’d never know ’cause I wouldn’t consider the ugly theory. MOND has no generally covariant extension. That’s an ugly theory. I ain’t considering nothin’ that ain’t got a proper cosmology.

Vincent: How about ΛCDM? ΛCDM has lots of small scale problems.

Jules: I don’t care about small scale problems.

Vincent: Yeah, but do you consider ΛCDM to be an ugly theory?

Jules: I wouldn’t go so far as to call ΛCDM ugly, but it’s definitely fine-tuned. But, ΛCDM’s got the CMB. The CMB goes a long way.

Vincent: Ah, so by that rationale, if a theory of modified dynamics fit the CMB, it would cease to be an ugly theory. Is that true?

Jules: Well, we’d have to be talkin’ about one charming eff’n theory of modified dynamics. I mean, it’d have to be ten times more charmin’ than MOND, you know what I’m sayin’?


5 thoughts on “Pulp Science

  1. Vincent: you mean, charming like … explaining the critical acceleration scale from first principles and stuff?
    Jules: Sure. Now you can do that, you got my attention. What’s this thing they do across the pond, quantized inertia ?


  2. Could you enlight those of your readers who are not scientists about that paper : E.V. Karukes et al. The universal rotation curve of dwarf disk galaxies, Monthly Notices of the Royal Astronomical Society (2016). DOI: 10.1093/mnras/stw3055

    Thanks for this blog,


    1. This paper says much the same thing as the radial acceleration relation: the rotation curve of a galaxy depends on its luminous mass and size. It is just phrased differently, and focuses on dwarf galaxies. When one specifies dwarfs, one gets a fairly typical characteristic rotation curve shape.


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