Recent content by jimgraber

  1. J

    KSTAR recent result and breakeven

    Thanks for the references
  2. J

    KSTAR recent result and breakeven

    I assume this result was from a run with ordinary hydrogen, no deuterium or tritium. But I think the equivalent DT values are frequently calculated. Is this possible here? TIA again
  3. J

    B What is going on at LIGO/VIRGO?

    Why no new data? No news of any problems that I have heard. I'm both mystified and concerned. Jim Graber
  4. J

    B Why 50% of entangled photons pass through the polarizer?

    Thanks for the references. It is somewhat clearer to me now, particularly in the context of entanglement.
  5. J

    B Why 50% of entangled photons pass through the polarizer?

    So, please, what is the difference (in math and in words) between "the Photon is V-Polarized along axis X" and "if we measure the polarization along angle x the result will be V" ? Thanks jim Graber
  6. J

    Commercially Feasible Fusion Reactor

    https://thebulletin.org/iter-showcase-drawbacks-fusion-energy11512 An interesting and well done pessimistic assessment.
  7. J

    Chernobyl Interesting new paper on Chernobyl

    http://www.tandfonline.com/doi/full/10.1080/00295450.2017.1384269 According to this paper, two nuclear explosions and one steam explosion took place.
  8. J

    A Tension between recent dark matter results and Lux-Xenon?

    How much tension between recent AMS-02 80 Gev dark matter and Lux-Xenon negative results? Recent results ( Arxiv 1610.03840 and 1704.08258) suggest a WIMP dark matter particle near 80 Gev. See also https://phys.org/news/2017-05-possibility-cosmic-rays-due-dark.html If this particle really...
  9. J

    B Fusion reactor status?

    In addition to pB, there is also DHe3. Helion Energy plans to use this fuel
  10. J

    Tokamak News and Queries

    At one point they were supposed to be running with plain ordinary hydrogen now, leading up to deuterium and tritium next year. Have they even restarted the plasma runs? I am pretty sure they are done building (or rebuilding) the beryllium and tungsten based "iter like wall" Woops, Google says...
  11. J

    Tokamak News and Queries

    http://www.sciencemag.org/news/2016/09/stewart-prager-steps-down-director-princeton-plasma-physics-laboratory?utm_campaign=news_daily_2016-09-27&et_rid=17668404&et_cid=840230 There is more news on the NSTX-U problem this morning. it looks pretty bad. jim graber
  12. J

    Tokamak News and Queries

    http://www.pppl.gov/news/2016/09/pppl-director-stewart-prager-steps-down It appears that Stuart Prager is “stepping down” as director of PPPL. I wish him well. But in the announcement it refers to a “recent technical setback in the NSTX-U facility”. I had not heard previously of this set...
  13. J

    I The typical and the exceptional in physics

    https://arxiv.org/abs/1405.3483 Steven Weinberg Quantum Mechanics Without State Vectors In this paper, SW proposes a formulation of QM based solely on density matrices. Does this solve the problem? How is it similar or different to the AN formulation? TIA Jim Graber
  14. J

    B Is the wave function physical ?

    Oh Yes. I was thinking of the range, not the domain. Is that C^3N? Or Only R^3N? Or sometihng bigger and more complicated? TIA Jim Graber
  15. J

    B Is the wave function physical ?

    Is it R^3N or C^3N? And does this make a difference as far as realness or physicality?
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