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pppqqq's user avatar
pppqqq's user avatar
pppqqq
  • Member for 11 years, 2 months
  • Last seen this week
  • Rome, Italy
29 votes

Isn't D'Alembert's wave equation enough to see that Galilean transformations are wrong?

12 votes

What's the point of Hamiltonian mechanics?

9 votes

Interpretation of "transition rate" in Fermi's golden rule

8 votes

What is the decay width and why is it given in energy units?

8 votes
Accepted

Dispensing with the "a priori equal probability" postulate

8 votes

$\theta$ angle QCD technically natural

7 votes
Accepted

Why can the pion decay into two photons?

7 votes

What is $\Delta t$ in the time-energy uncertainty principle?

7 votes

Why don't photons split up into multiple lower energy versions of themselves?

7 votes

Why does the expectation value of an operator $A$ take the form $\langle A\,\rangle=\int{\psi^* (x) A(x) \psi (x) dx}$ in QM?

6 votes

Proof of Liouville's theorem: Relation between phase space volume and probability distribution function

6 votes

How to derive $E=mc^{2}$?

6 votes

Expression of kinetic energy in polar coordinates

6 votes
Accepted

Understanding notation: Derivative with respect to operator

5 votes

Does every regularization/renormalization approach gives running coupling constants?

5 votes

$\phi^{4}$ Propagator - Feynman Diagram: internal vertex that loops back to itself

5 votes

How do I calculate the experimental uncertainty in a function of two measured quantities

5 votes
Accepted

Confusion about slash notation

4 votes

Purity of a maximally mixed quantum state

4 votes

Does work equal heat in an isothermal process only for an ideal gas?

4 votes

Can one derive Galilean transformations from the harmonic oscillator equations of motion and the relativity principle?

4 votes

Rigorous-ish mathematical meaning of having two total differentials in the denominator

3 votes
Accepted

Does isochoric expansion make sense?

3 votes

Difference between "C-violation without CP-violation" and "C-violation with CP -violation"

3 votes

Force Diagram for K&K 2.13

3 votes

Deriving combined gas law from Boyle's and Charles' laws

3 votes

Explain internal energy and enthalpy

3 votes

What exactly is enthalpy?

3 votes

Is $W=\oint{\vec{F}.d\vec{r}}=0$ sufficient condition for conservative force?

3 votes

Why does pressure decrease as velocity increases?