Recent content by Peter Morgan

  1. Peter Morgan

    I Who is Ballentine and why is he important in the world of quantum mechanics?

    It is different, but it can at least be thought of as the most direct record we have of a measurement of the electromagnetic field. In particular, such measurements are —I think by construction— the only recorded measurement results. From the totality of all such actually recorded measurement...
  2. Peter Morgan

    I Who is Ballentine and why is he important in the world of quantum mechanics?

    I've thought of this in terms of the moment when an analog signal out of some device is converted to a digital form that we then record. The output current from an Avalanche PhotoDiode or similar device is noisy but near zero, then it is noisy but near some value that is distinctly different...
  3. Peter Morgan

    I Who is Ballentine and why is he important in the world of quantum mechanics?

    Similarly to @Fra, I find it effective to think of QFT as a noisy signal analysis formalism. There has to be a data analysis component to that, which can be troublesome, but I will ignore that here. Signal analysis is about measurements, but it's realistic about real measurements never being...
  4. Peter Morgan

    I What if unification does not work?

    One aspect of GR/QFT unification is surely about the relationship between classical and quantum models. Another aspect is renormalization. Yet another is whether we should approach constructing mathematical models in an operational and empiricist way or in a more realist theory-driven way. In...
  5. Peter Morgan

    I Two approaches to science

    That seems to me remarkably close to the view I express in the video and papers I refer to in the comment I just posted.
  6. Peter Morgan

    I Two approaches to science

    I suggest the standard approach can be twisted around: Construct and perform experiments, as a result of which we have some number of Gigabytes or Exabytes of (noisy) data (it seems to me notable that in modern times we often generate that data at ~MHz rates, far faster than any real-time...
  7. Peter Morgan

    I Repeated measurements on a quantum system interacting with other quantum systems

    You only get the same result and the same state if you repeat precisely the same measurement. Put another way, how close the new measurement is to the old measurement determines how likely it is that you will get the same result. If there's an evolution between the two measurements that...
  8. Peter Morgan

    A Ensembles in quantum field theory

    I think only rather loosely, insofar as they use an extra test function to modify the dynamics. They still aspire to work with the Wightman axioms unchanged, so that there is only a linear dependence on the test functions that we use to describe the apparatus. Epstein-Glaser is generally not...
  9. Peter Morgan

    A Ensembles in quantum field theory

    Renormalization works. Yes. I think we can make it more rigorous, however, by paying much closer attention to how we use the test functions that describe an experiment. As we have had it, that description of an experiment has been taken to control the regularization and renormalization scales...
  10. Peter Morgan

    A Ensembles in quantum field theory

    Going a little off-topic in response to your third paragraph, I venture to say that I've given a mathematically rigorous formulation of a class of interacting quantum fields in (1+n)-dimensions in my "A source fragmentation approach to interacting quantum field theory"...
  11. Peter Morgan

    A Ensembles in quantum field theory

    Disclaimer: I've only scanned through the many comments here. I'm responding to the initial post in a way that I didn't notice reflected anywhere else. My apologies if it is. My theoretical approach to how I see that question has been to take any quantum model to be constructed as an algebra...
  12. Peter Morgan

    I The collapse of a quantum state as a joint probability construction

    As for any reasonable interpretation of QM, I think consistent histories is OK, because it's careful in its use of the mathematics of QM. I suspect it hasn't had as much impact as other interpretations partly because the mathematics it introduces is quite elaborate. In common with other...
  13. Peter Morgan

    I The collapse of a quantum state as a joint probability construction

    Thanks, @Morbert. Certainly I have noticed and others have noticed similarities in what I'm currently developing and the consistent histories interpretation that was already quite well-developed by 1990, say. I see many small differences, but because my ideas are currently spread through a...
  14. Peter Morgan

    I The collapse of a quantum state as a joint probability construction

    The titular paper can be found here, https://doi.org/10.1088/1751-8121/ac6f2f, and on arXiv as https://arxiv.org/abs/2101.10931 (which is paginated differently, but the text and equation and section numbers are the same). Please see the abstract, but in part this 24 page paper argues that we...
  15. Peter Morgan

    I Nature Physics on quantum foundations

    Unless I've misunderstood your meaning here, saying that 'there's no distinction between "classical" and "quantum" domains' has you needing, I think, something like my work to justify it. I suppose that for most physicists your lack of distinction must ring false. The traditional no-go...
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