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  1. J

    Rovelli in effect concedes that lqg is wrong, but still worthwhile

    The adage that "an idea is so stupid that it's not even wrong" is due to wolfgang pauli. His point was that only self-consistent theories can be judged to be logically false. In the absence of empirical data, we must rely quite a bit on self-consistency checks as a way to discriminate between...
  2. J

    Rovelli in effect concedes that lqg is wrong, but still worthwhile

    Let me begin by saying that I won't be the first to post inappropriate responses in this second attempt to treat the above subject. I previously posted the following: In the forward to rovelli's new book "Quantum Gravity", james bjorken states quite plainly that the effective field theory...
  3. J

    Rovelli in his new book admits lqg not correct, but still interesting in certain ways

    Why on earth did you think it was a good idea to post this?
  4. J

    String Gravitons yield GR. NOT

    You've got a lot of nerve to reprimand me for going off topic, especially since you do so all the time. In fact my remarks where well within the range of what is on topic in this post, namely gravitons. As I've said, the reason you've made it a hobby to dismiss the notion of gravitons is that...
  5. J

    String Gravitons yield GR. NOT

    Name two. Name a plausible one.
  6. J

    Rovelli in his new book admits lqg not correct, but still interesting in certain ways

    I've emailed rovelli the following: Hi Carlo, Congratulations on your book, which is better bound (and perhaps even better smelling, I think) than other books in that series. Now, my understanding is that the construction of lqg requires that General Relativity must be treated as if...
  7. J

    Rovelli in his new book admits lqg not correct, but still interesting in certain ways

    Who gives a sh*t about what lubos thinks? What he said doesn't have anything to do with what I'm talking about. If you have a problem with lubos, email him. My initial post is correct.
  8. J

    Rovelli in his new book admits lqg not correct, but still interesting in certain ways

    setai and jim, Did either of you actually check the book, or draft I quoted? I don't see any evidence of this or of any physical arguments in your answers. Despite marcus's usual word games and twisted meanings, what I wrote is simple to check, understand, and in fact, correct. You must...
  9. J

    Rovelli in his new book admits lqg not correct, but still interesting in certain ways

    In the forward to rovelli's new book "Quantum Gravity", james bjorken states quite plainly that the effective field theory approach to quantum gravity correctly taught us that GR must be viewed as just an effective field theory, and in fact this is the universally shared view. The problem for...
  10. J

    String Gravitons yield GR. NOT

    I'm sorry marcus, but as everyone here knows, you've stated quite plainly numerous times that you don't believe in the idea of gravitons. Of course you said this because you thought that lqg - your religion - is inconsistent with the idea of the graviton so that this idea must be unholy...
  11. J

    Introduction To Loop Quantum Gravity

    You want to play games? Fine with me.
  12. J

    Introduction To Loop Quantum Gravity

    We'll, I don't have the book on hand, but... In rovelli's dec 30 2003 draft, he says on page ix entitled "PREFACE" "What we need is not just a technique for computing, say, graviton-graviton scattering amplitudes (although we certainly want to be able to do so, eventually)" On page 5 of...
  13. J

    Introduction To Loop Quantum Gravity

    I sincerely hope you enjoy your new book, which I know you will. I was leafing through it at the U of T bookstore. I want to point out two things carlo says in the introductory bit. 1) That any correct quantum gravity theory must be able to calculate amplitudes for graviton-graviton...
  14. J

    Rovelli book's out

    Funny, that's the only part of Connes otherwise misleading blurb I agree with.
  15. J

    Spin networks and quantum computing (curious link-up)

    It would be good if something could be salvaged from spin-networks. :tongue2:
  16. J

    Strings or LQG and why?

    By this remark einstein meant that the criticism of his work by german scientists had nothing to do with science and was simply an act of anti-semitism, general relativity being derided at that period in germany's history as "jewish" physics.
  17. J

    Loop-and-allied QG bibliography

    Forget lubos's personality. His posts are full of valuable insights that are difficult to come by for most people here. Anyway, he never commits the crime of pretending to be something he's not, which is more than I can say for some of the people here.
  18. J

    Loop quantum gravity

    What, no more poetry?! :eek:
  19. J

    Is String Theory really a theory?

    Sol, What's your first language?
  20. J

    Is String Theory really a theory?

    Look, the issue has never been whether we need to invoke the anthropic principle or whether it indicates some basic flaw in string theory. The issue is that people are wasting time trying to solve problems that string theory in it's current state of development isn't ready for. So when you read...
  21. J

    Is String Theory really a theory?

    My experience at PF has taught me that the only questions worth my time in answering are those that are well-posed and addressed directly to me.
  22. J

    Is String Theory really a theory?

    whydoyouwanttoknow, All current approaches to the problem of how to quantize gravity or how to integrate all fundamental interactions into a single unified framework are more research program than theory. This is an inevitability when experiment isn’t able to keep up with imagination. The...
  23. J

    Is String Theory really a theory?

    When you're just a beginner, it's easy in this particular forum to get fooled into believing people here know more than they actually do. Truthfully there's hardly anyone here who knows what they're doing. Unfortunately some of them post with a misleading air of authority. So remember to ask...
  24. J

    A scientific multiverse theory

    Precisely my friend.
  25. J

    Smolin's 1995 Landscape of Physical Law idea

    It's enough with the arts and humanities already. Checking out new posts which repeatedly turn out to have nothing to do with the topic of the thread - or with science even - is annoying and a waste of my time. Knock it off.
  26. J

    A scientific multiverse theory

    And scientific research programs have the goal of producing scientific theories.
  27. J

    Meissner corrects the Immirzi parameter

    Dreyer’s idea of uniquely fixing immirzi by using a conjecture due to hod in relation to results of an investigation of schwarzshild quasinormal modes fell through when it was found that quasinormal modes associated with other black hole types give different values of immirzi.
  28. J

    Smolin: Anthropery is not science

    What started this whole thing was the astonishing discovery that, contrary to all previous thinking, our universe is undergoing accelerated expansion. This can be considered in the framework of GR as indicating something like a de sitter cosmology. However, the moduli space of string vacua...
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