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MathPrinceps's profile
Laurens Gunnarsen
Laurens Gunnarsen
Laurens Gunnarsen
@MathPrinceps

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Laurens Gunnarsen

@MathPrinceps

Mathematical physicist and mentor to mathematically talented youth. Talent is that which bridges the gap between what can be taught and what must be learned.

Joined June 2012

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    1. Sabine Hossenfelder‏Verified account @skdh 7 Feb 2019
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      Fairly long review of "Lost in Math" by a philosopher of science, Jeremy Butterfield. It's an interesting read & will give you a good impression what my book is about. Pls be warned that in some places he misrepresents my argument. More on my blog later. http://philsci-archive.pitt.edu/15724/1/HossenfReview2feb19.pdf …

      2 replies 8 retweets 36 likes
    2. John Carlos Baez‏ @johncarlosbaez 8 Feb 2019
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      Replying to @skdh

      Generally good, but this seems weak to me: "quantum field theory and general relativity are victims of their own success. For we need to go beyond them, since they face various technical and conceptual problems: such as the hierarchy and cosmological constant problems."

      2 replies 0 retweets 11 likes
    3. John Carlos Baez‏ @johncarlosbaez 8 Feb 2019
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      Replying to @johncarlosbaez @skdh

      Those dubious problems aren't the main reasons we need to go beyond QFT and GR. We need to go beyond them because they are inconsistent with each other. We need to find a consistent framework for physics.

      6 replies 3 retweets 29 likes
    4. Timothy Gowers‏ @wtgowers 8 Feb 2019
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      Replying to @johncarlosbaez @skdh

      The way I interpreted that remark was that because QFT and GR apply to great accuracy way beyond the domains that they were originally designed for, they feel more universal, and therefore their inconsistency is all the more puzzling.

      3 replies 0 retweets 5 likes
    5. Timothy Gowers‏ @wtgowers 8 Feb 2019
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      Replying to @wtgowers @johncarlosbaez @skdh

      But that was just the "victims of their own success" part, and not the bits you describe as dubious problems, where I'm not qualified to comment.

      1 reply 0 retweets 2 likes
    6. John Carlos Baez‏ @johncarlosbaez 8 Feb 2019
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      Replying to @wtgowers @skdh

      The "cosmological constant problem" is that the cosmological constant is 10^{-120}, which some people consider oddly small. The "hierarchy problem" is that the Higgs boson mass is a lot smaller than the Planck mass.

      5 replies 1 retweet 9 likes
    7. John Carlos Baez‏ @johncarlosbaez 8 Feb 2019
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      Replying to @johncarlosbaez @wtgowers @skdh

      Both these problems are precisely the kind that @skdh argues we should pay less attention to. They're called "naturalness problems": situations where people worry that a dimensionless constant is suspiciously large or small. They are not inconsistencies between GR and QFT.

      2 replies 0 retweets 9 likes
    8. John Carlos Baez‏ @johncarlosbaez 8 Feb 2019
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      Replying to @johncarlosbaez @wtgowers @skdh

      Thus, it's odd that Butterfield listed these two problems and not the vastly more important problem that the Standard Model and GR can't both be correct. We know we need to tweak one or both of these theories to get a consistent framework that fits the data we have!

      2 replies 0 retweets 5 likes
    9. Timothy Gowers‏ @wtgowers 8 Feb 2019
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      Replying to @johncarlosbaez @skdh

      To understand this more precisely, can we say something stronger, such as that GR is actually wrong at small scales -- that is, conflicts with experiment rather than just with the Standard Model? And is there any large-scale phenomenon that the Standard Model gets wrong?

      4 replies 0 retweets 3 likes
    10. Laurens Gunnarsen‏ @MathPrinceps 10 Feb 2019
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      Replying to @wtgowers @johncarlosbaez @skdh

      Professor Gowers, I regret not responding earlier to this question, because it's absolutely crucial. No experiment probing the microworld has ever revealed a defect in GR. But the logic of propositions referring to denizens of the microworld is inconsistent with GR.

      1 reply 0 retweets 0 likes
      Laurens Gunnarsen‏ @MathPrinceps 10 Feb 2019
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      Replying to @MathPrinceps @wtgowers and

      This, I would argue, is the key point: I want particularly to stress that this logic is mandated not by QM, but by observation. Its validity in its domain of application is unambiguously affirmed not indirectly, via the successes of QM, but directly, by the phenomena themselves.

      6:42 PM - 10 Feb 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Laurens Gunnarsen‏ @MathPrinceps 10 Feb 2019
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          Replying to @MathPrinceps @wtgowers and

          I cannot emphasize this strongly enough: we observe directly phenomena in the microworld that are irreconcilable with the most primitive assumptions of GR. It's not the overwhelming empirical success of QM that obliges us to accept a non-classical logic. It's direct observation.

          1 reply 0 retweets 0 likes
        3. Laurens Gunnarsen‏ @MathPrinceps 10 Feb 2019
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          Replying to @MathPrinceps @wtgowers and

          I have long been profoundly grateful to the late great Itamar Pitowsky for making this point exquisitely clear to me at last, and I wish his brilliant expositions of the essential ideas here were vastly better known. In particular, I strongly recommend:http://bit.ly/2GCzU31 

          0 replies 0 retweets 0 likes
        4. End of conversation

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