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21 votes

Do identical starting conditions always lead to identical outcomes?

18 votes
Accepted

Unfamiliar Notation in Sakurai

15 votes

Matrices in Dirac Notation

14 votes

What is a dual / cotangent space?

13 votes

If a wave function collapses into one state, does it ever go back to a superposition of states?

13 votes

Is there a proof that the set of real numbers can exactly represent distances?

12 votes
Accepted

Difference between Fock space and Hilbert Space

11 votes
Accepted

Why do we care about the spectrum of the Hamiltonian?

11 votes

Why do we care about chirality?

11 votes

Why does group representation theory look linear?

10 votes

$[a,a^{\dagger}]=1$ or $[a,a^{\dagger}]=I$

9 votes

Is it obvious that the Hamiltonian observable in Quantum Mechanics should also be the Energy observable?

9 votes
Accepted

How $[x,p]=i \hbar$ implies that $x$ and $p$ do not have simultaneous eigenstates?

9 votes

Is Galilean boost actually a gauge transformation?

7 votes

Can Schwarzschild Metric be derived from curvilinear coordinates in special relativity?

7 votes
Accepted

Einstein field equations in empty space, question about non-zero curvature

7 votes

Difference between Tensor product, dot product and the action of dual vector on a vector

7 votes

How to derive Gauss's law for magnetism?

6 votes
Accepted

Learn about tensors for physics

6 votes

Scalar fields and general coordinate transformations

6 votes

What does the continuum hypothesis of fluid mechanics mean?

6 votes
Accepted

In continuum mechanics, why is the stress vector $T=\sigma\cdot n$ not a covector?

6 votes
Accepted

Difference between Lorentz group and Poincare group

6 votes
Accepted

How to prove that $ \delta \frac{dq_i}{dt} = \frac{d \delta q_i}{dt} $?

6 votes

What is the actual use of Hilbert spaces in quantum mechanics?

5 votes
Accepted

Vacuum polarisation in QED - why is it significant to renormalisation?

5 votes

What is a soft photon?

5 votes
Accepted

Interactions in String Theory

5 votes

Von Neumann entropy: How do we get $S(\rho)=-\sum_i p_i \ln(p_i)$?

5 votes
Accepted

How many states for two spin 1 particles?

1
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