Recent content by PORFIRIO I

  1. PORFIRIO I

    Graduate Where did this term in the path integral come from?

    I'm trying to derive the path integrals, but this step got me confused: Consider the propagator $$K_{q_{j+1},q_j}=\langle q_{j+1}|e^{-iH\delta t}|q_j\rangle $$ Knowing that ##\delta t## is small, we can expand it as $$K_{q_{j+1},q_j}=\langle q_{j+1}|(1-iH\delta t-\frac 1 2 H² \delta...
  2. PORFIRIO I

    Undergrad A question about the Collapse of a Wavefunction

    Thanks, that was very helpful!
  3. PORFIRIO I

    Undergrad A question about the Collapse of a Wavefunction

    I’m new in QM. I have a simple question: when one says that the wavefunction collapses, is it the same as saying that the variance of an observable is 0? Thanks.
  4. PORFIRIO I

    Mastering Astronomy for Science Enthusiasts

    Thanks.
  5. PORFIRIO I

    Graduate Electrons colliding with gas molecules

    My concern is an electron tube. From what I understood so far, gas molecules will have an average velocity derived from the Maxwell distribution, and that velocity will influence in the electron collision frequency. I can't see clearly though how the electron velocity itself in the presence...
  6. PORFIRIO I

    Mastering Astronomy for Science Enthusiasts

    Thank you.
  7. PORFIRIO I

    Mastering Astronomy for Science Enthusiasts

    Hello, I'm Porfirio from Rio de Janeiro, Brazil. I'm on my last semester of undergrad school. I just need to complete an internship and finish writing my monograph. Thinking about getting a Master degree in Astronomy or science teaching.