7 comments

  • readingnews 2 hours ago
    Not sure why you have to read 3/4 of the article to get to a _link_ to a pdf which _only_ has the _abstract_ of the actual paper:

    N. Benjamin Murphy and Kenneth M. Golden* (golden@math.utah.edu), University of Utah, Department of Mathematics, 155 S 1400 E, Rm. 233, Salt Lake City, UT 84112-0090. Random Matrices, Spectral Measures, and Composite Media.

    • troelsSteegin 1 hour ago
      heres's a corresponding video: https://www4.math.duke.edu/media/index.html?v=3d280c1b658455...

      "We consider composite media with a broad range of scales, whose effective properties are important in materials science, biophysics, and climate modeling. Examples include random resistor networks, polycrystalline media, porous bone, the brine microstructure of sea ice, ocean eddies, melt ponds on the surface of Arctic sea ice, and the polar ice packs themselves. The analytic continuation method provides Stieltjes integral representations for the bulk transport coefficients of such systems, involving spectral measures of self-adjoint random operators which depend only on the composite geometry. On finite bond lattices or discretizations of continuum systems, these random operators are represented by random matrices and the spectral measures are given explicitly in terms of their eigenvalues and eigenvectors. In this lecture we will discuss various implications and applications of these integral representations. We will also discuss computations of the spectral measures of the operators, as well as statistical measures of their eigenvalues. For example, the effective behavior of composite materials often exhibits large changes associated with transitions in the connectedness or percolation properties of a particular phase. We demonstrate that an onset of connectedness gives rise to striking transitional behavior in the short and long range correlations in the eigenvalues of the associated random matrix. This, in turn, gives rise to transitional behavior in the spectral measures, leading to observed critical behavior in the effective transport properties of the media."

    • magicalhippo 1 hour ago
      From the abstract:

      In this lecture we will discuss computations of the spectral measures of this operator which yield effective transport properties, as well as statistical measures of its eigenvalues.

      So a lecture and not a paper, sadly.

  • FjordWarden 1 hour ago
    Maybe also heap fragmentation
    • redleader55 14 minutes ago
      This is interesting, do you have a link to any research about this?
      • FjordWarden 9 minutes ago
        No, it is a hypothesis I formulated here after reading the article. I did a quick check on google scholar but I didn't hit any result. The more interesting question is, if true, what can you do with this information. Maybe it can be a way to evaluate a complete program or specific heap allocator, as in "how fast does this program reach universality". Maybe this is something very obvious and has been done before, dunno, heap algos are not my area of expertise.
  • cosmic_ape 3 hours ago
    2013 But still cool
  • Joel_Mckay 1 hour ago
    The Physics models tend to shake out of some fairly logical math assumptions, and can trivially be shown how they are related.

    "How Physicists Approximate (Almost) Anything" (Physics Explained)

    https://www.youtube.com/watch?v=SGUMC19IISY

    If you are citing some crank with another theory of everything, than that dude had better prove it solves the thousands of problems traditional approaches already predict with 5 sigma precision. =3

    • kitd 1 hour ago
      > The pattern was first discovered in nature in the 1950s in the energy spectrum of the uranium nucleus, a behemoth with hundreds of moving parts that quivers and stretches in infinitely many ways, producing an endless sequence of energy levels. In 1972, the number theorist Hugh Montgomery observed it in the zeros of the Riemann zeta function(opens a new tab), a mathematical object closely related to the distribution of prime numbers. In 2000, Krbálek and Šeba reported it in the Cuernavaca bus system(opens a new tab). And in recent years it has shown up in spectral measurements of composite materials, such as sea ice and human bones, and in signal dynamics of the Erdös–Rényi model(opens a new tab), a simplified version of the Internet named for Paul Erdös and Alfréd Rényi.

      Are they also cranks? Seems it at least warrants investigation.

      • Joel_Mckay 1 hour ago
        >Are they also cranks?

        That is a better question. =3

    • nkrisc 1 hour ago
      What does “5 sigma precision equals 3” mean?
      • magicalhippo 1 hour ago
        =3 is a cat face[1] smiley, the period preceding it ends the sentence.

        [1]: https://en.wikipedia.org/wiki/List_of_emoticons

      • Joel_Mckay 1 hour ago
        lol =3
        • nkrisc 1 hour ago
          It was a serious question but I see I should not expect an answer.
          • throawayonthe 1 hour ago
            not sure if you're joking but it's an emoticon:

            =3

            look at it like a sideways face of a cartoon cat, with 3 being the mouth shape

            so their actual sentence ends at the period

            • nkrisc 1 hour ago
              Ok, I see it now. I thought the period was a typo and they were trying to write some sort of expression.

              I still don’t understand why the emoticon is there or its purpose but whatever.

              • Joel_Mckay 1 hour ago
                [censored]

                Cheers =3

                • tux3 58 minutes ago
                  Please stop jumping to conclusions about what diagnoses you think other people have.

                  That is not helping.

                • nkrisc 54 minutes ago
                  I don’t have autism, but thanks. Ending a (every, apparently) comment with “=3” is not normal so I mistook its meaning.
  • dist-epoch 2 hours ago
    There is the well known problem that "random" shuffling of songs doesn't sound "random" to people and is disliked.

    I wonder if the semi-random "universality" pattern they talk about in this article aligns more closely with what people want from song shuffling.

    • pegasus 2 hours ago
      It's not that a random shuffling of songs doesn't sound random enough, it's that certain reasonable requirements besides randomness don't hold. For example, you'd not want hear the same track twice in a row, even though this is bound to happen in a strictly random shuffling.
      • nkrisc 1 hour ago
        Random shuffling of songs usually refers to a randomized ordering of a given set of songs, so the same song can’t occur twice in a row if the set only contains unique items. People don’t usually mean an independent random selection from the set each time.
      • jonathanstrange 2 hours ago
        If the list of songs is random shuffled, you can only hear the same song twice if there is a duplicate or if you've cycled through the whole list. That's why you shuffle lists instead of randomly selecting list elements.
  • anthk 3 hours ago
    https://pmc.ncbi.nlm.nih.gov/articles/PMC11109248/

    DNA as a perfect quantum computer based on the quantum physics principles.