• Nice explanation of quantum field calculations -v- classical curved spa

    From thang ornerythinchus@1:229/2 to All on Thursday, October 12, 2017 07:08:27
    From: thangolossus@gmail.com

    https://medium.com/starts-with-a-bang/are-space-time-and-gravity-all-just-illusions-d1d088df6150

    Under conventional circumstances, quantum field theory calculations
    are done in flat space, where spacetime isn’t curved. We can do them
    in the curved space described by Einstein’s theory of gravity as well, although the calculations are far more difficult. This semi-classical
    approach gets us far, but it doesn’t get us everywhere. In particular,
    there are a few strong-field situations where we simply cannot obtain
    sensible answers using our current theories:

    What happens to the gravitational field of an electron when it passes
    through a double slit?

    What happens to the information of the particles that form a black
    hole, if the black hole’s eventual state is thermal radiation?

    And what is the behavior of a gravitational field/force at and around
    a singularity?

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