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39 Likes

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  1. tk421
    tk421 liked post by btr On thread : Turning light into matter
    Photons do interact, but as I showed earlier on QED is absolutely clear that it is only possible with the help of other fields which do carry charge. If you insist that photons interact directly (in...
    Liked On: 05-24-2014, 12:39 AM
  2. Jilan
    Jilan liked post by btr On thread : Turning light into matter
    Photons do interact, but as I showed earlier on QED is absolutely clear that it is only possible with the help of other fields which do carry charge. If you insist that photons interact directly (in...
    Liked On: 05-23-2014, 08:28 PM
  3. sssunnn
    sssunnn liked post by btr On thread : Quantum Simple Harmonic Oscillator
    There is an interpretation of quantum mechanics due to David Bohm which goes along these lines. It is debatable whether it is a good way of picturing things, particularly when there are multiple...
    Liked On: 05-21-2014, 05:21 AM
  4. Jilan
    Jilan liked post by btr On thread : 1/h as a coupling constant
    It is predicted by theory and confirmed experimentally. The simplest way of putting it is that the apparent charge of a particle increases very slightly if you get really close to it, as though it...
    Liked On: 05-21-2014, 05:14 AM
  5. Jilan
    Jilan liked post by btr On thread : 1/h as a coupling constant
    The constraint is that alpha (the fine structure constant), being a fundamental dimensionless constant, has the same value in all systems of units. So, you can pick any three from the set ε0, c, ħ...
    Liked On: 05-20-2014, 06:41 PM
  6. Markus Hanke
    Markus Hanke liked post by btr On thread : Bianchi IX
    I guess in the present context you could say that the Lie algebra so(2,1) is important because it is the algebra of Killing vector fields in a Bianchi VIII space. The group SO(2,1) can also be...
    Liked On: 05-20-2014, 03:00 PM
  7. Markus Hanke
    Markus Hanke liked post by btr On thread : Bianchi IX
    SO(2,1) is not a subgroup of SO(3). If you think of SO(3) as the group of orientation-preserving linear transformations of R3 which preserve x2 + y2 + z2, you can view SO(2,1) - among other ways -...
    Liked On: 05-17-2014, 12:24 PM
  8. Markus Hanke
    Markus Hanke liked post by btr On thread : Does Dark Matter repel other dark matter?
    Dark matter doesn't form hollow shells around galaxies, as the term halo might intuitively suggest. The density is (mostly thought to be) greatest at the galactic centre, and falls away as you move...
    Liked On: 05-17-2014, 06:59 AM
  9. brucep
    brucep liked post by btr On thread : Does Dark Matter repel other dark matter?
    Dark matter doesn't form hollow shells around galaxies, as the term halo might intuitively suggest. The density is (mostly thought to be) greatest at the galactic centre, and falls away as you move...
    Liked On: 05-17-2014, 05:29 AM
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