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  1. 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...
  2. 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...
  3. J

    The truth about lqg and background-independence

    In the paper Separable Hilbert space in Loop Quantum Gravity carlo rovelli explains why it's not yet known whether lqg is background-independent and discrete. The problem is that isotopic graphs constructed in lqg from spin-networks aren’t in general diffeomorphic, so the isotopy-equivalence...
  4. J

    I'm sorry marcus, but really, strings remain an essential part of college syllubi

    I'm sorry marcus, but as you probably know by now, familiarity with the main ideas of string theory and supersymmetry is pretty much mandatory for all students planning to go into theoretical physics, so courses in strings and supersymmetry continue to be a standard part of college syllubi (in...
  5. J

    I'm sorry, marcus, but strings continue to dominate high energy theory

    I'm sorry, marcus, but as you well know, strings continue to dominate high energy theory, despite your efforts to fool people into somehow doubting this. In fact, marcus, strings have gone through a number of (relatively) barren periods, the last one ending when D-branes and dualities where...
  6. J

    Problem with unicode

    For example, previewing Gamma; converts it to Γ in the text box. Previewing again then displays a question mark.
  7. J

    Suggestion for mentors

    Mentors should keep in mind that instantly supplying "the correct answer" can cut down opportunities for less knowledgeable members to benefit from the special advantages of learning through discussion and debate.
  8. J

    Useful annotated overview of string theory literature

    The following paper entitled Resource Letter: The Nature and Status of String Theory was authored by Donald Marolf at UCSB. It gives a useful annotated overview of string theory literature, both popular and technical. http://xxx.lanl.gov/abs/hep-th/0311044
  9. J

    A simple puzzle

    Consider the standard "guess which one of three curtains the prize is behind" scenario. After choosing curtain 1, you're shown that nothing resides behind curtain 2. If allowed, would you switch to curtain 3?
  10. J

    What causes the snapping sound when a towel is snapped?

    What causes the snapping sound when a towel is snapped? I'm hoping that no one here has seen this before. I already know the answer.
  11. J

    Favourite physics books or topics? What are you studying currently?

    I'm asking because I'm trying to get a feel for this forum.
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