Recent content by emz

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    Photon pressure from energy density

    Thank you Chalnoth.
  2. E

    Photon pressure from energy density

    Why is photon gas pressure = photon energy density (per volume) divided by 3? Thank you
    • emz
    • Thread
    • Density Energy Energy density Photon Pressure
    • Replies: 5
    • Forum: Cosmology
  3. E

    Genereral:Questions about Srednicki's QFT

    I thought the definition of a scalar field was the numerical value of the field at a given point to be Lorentz invariant. That is U(\Lambda) \varphi(\Lambdax)=\varphi(x)
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    Genereral:Questions about Srednicki's QFT

    A simple, new question on Srednicki's book: Equation 2.26 : U(\Lambda)^{-1} \varphi(x)U(\Lambda)= \varphi(\Lambda^^{-1}x) which describes how a scalar field transforms under Lorentz transformation is not derived in the book. Instead it seems to be inspired by time-translation equation...
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