Robert McNees

@mcnees

Professor, physicist, sci comm. Black holes, quantum gravity, cosmology. Rocky Top. Tar Heel. RTs are spooky action at a distance. Opinions mine alone. He/him.

Chicago, z=0
Vrijeme pridruživanja: lipanj 2008.

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  1. Prikvačeni tweet
    24. srp 2015.
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  2. prije 2 sata

    "We took the bleep from the moon and turned it into pictures of the lunar surface." –– The Daily Express explaining its front-page image a few days after the Luna 9 landing.

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  3. prije 2 sata

    The probe was active for three days after landing, until its batteries ran down.

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  4. prije 2 sata

    The Soviet space probe Luna 9 landed on the Moon in 1966, touching down in the Ocean of Storms for the first successful soft landing on another celestial body. It sent back grainy tv camera images –– the first from the surface of another world. Image: NASA

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  5. prije 4 sata
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  6. prije 13 sati

    This astonishing ignoramus.

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  7. prije 14 sati

    Waiting for the second tweet in this thread.

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  8. prije 14 sati

    [cut to him in the Oval Office holding a map and a sharpie]

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  9. proslijedio/la je Tweet
    2. velj

    Dirac's paper on the quantum emission and absorption of radiation, advancing the first truly quantum theory of electrodynamics, was submitted to the Royal Society in 1927. It is considered by many to mark the beginning of Quantum Field Theory.

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  10. prije 19 sati

    Lol, I would love to see this flat earth orbital mechanics model.

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  11. proslijedio/la je Tweet
    prije 19 sati

    Spouse told Alexa to add half and half to the shopping list.

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  12. prije 20 sati

    Sorry if you’ve tweeted at me today and I haven’t responded, I’ve been busy explaining to people that 01/02/2010 isn’t a palindrome if you write it 02/01/2010.

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  13. prije 24 sata

    Look at this majestic sonuvagun.

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  14. 2. velj

    BHJ expanded the field in Fourier modes, then wrote the time-dependent coefficients of the modes as creation and annihilation operators with the usual commutation relations. So in a sense, Dirac’s approach to QFT was actually preceded by a two-dimensional string theory.

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  15. 2. velj

    They let their field depend on time and a single direction x which ran from 0<x<L. They set the field to zero at the ends, so it was like quantizing the displacement of a string on a violin or guitar. You can see where this is going.

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  16. 2. velj

    And while this was the beginning of QFT, and in particular quantum electrodynamics, it was *not* the first attempt to quantize electromagnetic waves. Born, Heisenberg, and Jordan tried in their 1926 paper "Zur Quantenmechanik. II.”

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  17. 2. velj

    Friends, I always wait too long to add this part: You should go buy my wife’s beautiful novel about Eleanor Roosevelt and Lorena Hickok.

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  18. 2. velj

    Dirac's paper on the quantum emission and absorption of radiation, advancing the first truly quantum theory of electrodynamics, was submitted to the Royal Society in 1927. It is considered by many to mark the beginning of Quantum Field Theory.

    Prikaži ovu nit
    Poništi
  19. proslijedio/la je Tweet

    My favorite palindrome: Satan, oscillate my metallic sonatas!

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  20. 2. velj

    “avocado-related knife injuries” nice use of the passive voice npr.

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  21. proslijedio/la je Tweet
    2. velj
    Odgovor korisnicima

    It is also invariant to be read upside down!

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