Recent content by gasgas

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    A Confusion about creation/annihilation operators with interaction

    I'm currently going through Peskin and Schroeder's Intro to QFT textbook, chapter 4.2 "Perturbation Expansion of Correlation Functions". So we use the evolution of an operator in the Heisenberg picture from some time t0 to an arbitrary time t>t0 assuming we know how the field looks at t0. Then...
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    A Uncertainties in the proof of Proposition 4.4.2 in Hawking and Ellis

    Thank you so much, I will study these notes further.
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    A Uncertainties in the proof of Proposition 4.4.2 in Hawking and Ellis

    Hello, I'm having quite a lot of trouble with working through the proof of this proposition in Hawking and Ellis's "Large Scale Structure of Spacetime". First of all, I am unsure of how the matrix element A that is in the proof can be the same matrix element as in equation 4.39 because there we...
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    Ring Impedance & String Connection: Is It Valid?

    If we consider the coefficient b as the rings impedance, we can consider the effective impedance on the right to be b+Z2 where Z2 is the impedance of the second string. Then because there is no reflection it follows that Z1=b+Z2 or b=Z1-Z2. Is this a valid solution? My professor went through a...
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