Recent content by Paul Colby

  1. Paul Colby

    Graduate Running lattice QCD on Apple Silicon with native Metal GPU

    Why is the GitHub link redacted? Are there references to published work on your code?
  2. Paul Colby

    Graduate Quaternionic Rays instead of Complex

    Yes, I purchased this text quite some time ago and put it down when it became apparent the concept was a wash. As to Adler referencing Trifonov's work, this would require a causality violation. Trifonov references Adler. One is reminded that while all physics is mathematics, not all mathematics...
  3. Paul Colby

    Graduate Quaternionic Rays instead of Complex

    Adler wrote a book, "Quaternionic Quantum Mechanics and Quantum Fields." Any overlap with Trifonov? It's a big book I haven't spent much effort on. Trifonov doesn't appear in Adler's references.
  4. Paul Colby

    High School Knowledge and information in the physical world

    If that's your question then, yes. Quantum objects don't hold information that determines the outcome of the interaction was my test assertion. A possible counter example is given by entangled particles. Entangled particles occupy a multi particle state which correlate their subsequent...
  5. Paul Colby

    High School Knowledge and information in the physical world

    So, if I said the answer is no, could you provide a counter example?
  6. Paul Colby

    High School Knowledge and information in the physical world

    What's a "physical participant" in a quantum interaction? As far as I know, and this may not be very far, the basic rules of QM provide no information as to when a given isolated atom or nucleus will decay. It only provides decay rates of collections of such systems. So, is there a means for...
  7. Paul Colby

    Graduate Gravitational wave propagation in GR - follow up

    I don’t follow your question. [deleted synchronous gauge]
  8. Paul Colby

    Graduate Gravitational wave propagation in GR - follow up

    As I recall transverse refers to ##\partial^\mu h_{\mu\nu} =0## which is the case. EM waves are transverse in that E and H are orthogonal to the wave vector.
  9. Paul Colby

    Insights Remote Operated Gate Control System

    There should be one (and only one) def per state. onStarting, onOpen, onClosed, onOpening, and, onClosing. Anyway, a working solution is a working solution.
  10. Paul Colby

    Insights Remote Operated Gate Control System

    Cool project. State machines can be very effective. I find the design pattern used here kinda ugly. For certain, it works, but an alternative I've found useful is to encapsulate States as functions. In a recent project I needed to parse bytes from a USB device in realtime. In c++ states were...
  11. Paul Colby

    Graduate Gravitational wave propagation in GR - follow up

    If I recall correctly, a plane wave in the TT gauge propagating along z is, $$ h_{\mu\nu} = H_+ f(t-z) + H_\times g(t-z) $$ where ##f## and ##g## are arbitrary functions. The constant polarization matrices are, $$ H_+ = \left(\begin{array}{cccc} 0 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & -1 & 0...
  12. Paul Colby

    Graduate Gravitational wave propagation in GR - follow up

    At this point I find it instructive to consider some numbers. A round trip time for light in a 4km long interferometer is, $$ \frac{8\times 10 ^3}{3\times 10^8} = 27 us $$ Gravitational events detected are in 500ms to 1s duration range. Of course the number of light transversals for LIGO is much...
  13. Paul Colby

    Spatial Perturbative Hamiltonians In Systems of Identical Particles

    The spin states are completely degenerate since your Hamiltonian doesn't depend on spin. You've chosen an orthogonal set of spin states so you're diagonal already. I can't think of a reason why this wouldn't generally be the case. Nice work.
  14. Paul Colby

    Graduate Gravitational wave propagation in GR - follow up

    I mean proper distance changes with ##s##, the proper time. These are frame independent quantities. In the TT coordinates, ##s=t##. The actual measurement occurs at the point where the beams from each arm are combined. What’s measured is the time variation of the light intensity caused by the...
  15. Paul Colby

    Graduate Gravitational wave propagation in GR - follow up

    Yes. The ##\Gamma^\mu_{\nu\alpha}## terms in the geodesic equation only sprout space components in the TT gauge. Basically, ##\Gamma^x_{tt}=\Gamma^y_{tt}=\Gamma^z_{tt} = 0##. A point particle at rest in this frame remains at rest as the wave passes because all the ##\frac{dx^\mu}{ds}## terms...