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FriendlyLagrangian
  • Member for 2 years, 5 months
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94 votes
10 answers
14k views

Quantum Entanglement - What's the big deal?

  • 1,524
21 votes
5 answers
4k views

What happened with Hilbert's sixth problem (the axiomatization of physics) after Gödel's work?

6 votes
2 answers
701 views

Examples of non-Hermitian Hamiltonians in open systems?

6 votes
2 answers
973 views

Fastest numerical method to solve Lindblad Master Equation?

  • 357
6 votes
1 answer
187 views

Why is the electromagnetic duality an S-duality?

6 votes
2 answers
440 views

What makes electrons in the conduction band conductive?

6 votes
3 answers
604 views

What is meant in condensed matter physics by a “gap” and why is it so important?

5 votes
1 answer
1k views

Born-Markov Approximation: Why is $\rho_{I}(s) \to \rho_{I}(t)$ taken, and not $\rho(s) \to \rho(t)$?

5 votes
1 answer
236 views

Meaning of "Exactly solvable in the large $N$ limit" for the SYK model

5 votes
2 answers
281 views

Lindblad equation unitary term (in practice)

5 votes
1 answer
269 views

Why does the "entanglement entropy" provide a necessary and sufficient condition for bipartite entanglement?

5 votes
1 answer
2k views

Why do we need the material derivative?

  • 30.1k
4 votes
3 answers
7k views

On the completeness relation in Quantum Mechanics

4 votes
0 answers
57 views

Electromagnetism in spacetime with 2-times split-signature $(+,+,-,-)$ metric

  • 427
4 votes
3 answers
2k views

How to prove that time stops at the speed of light using general relativity in a flat spacetime?

3 votes
2 answers
69 views

Semi-group in quantum open systems

  • 156
3 votes
0 answers
97 views

Vacuum state after diagonalising a free Hamiltonian?

3 votes
1 answer
659 views

Is a quadratic Majorana Hamiltonian exactly solvable?

  • 995
2 votes
0 answers
227 views

Does this paper contradict the existence of non-relativistic quantum mechanics? [closed]

2 votes
1 answer
197 views

Do gravitational lenses act as prisms?

2 votes
2 answers
199 views

Proof of this version of Wick’s theorem?

2 votes
1 answer
272 views

Can you represent a diagonal density matrix with creation/annihilation operators?

2 votes
0 answers
76 views

Why does the no-cloning theorem imply the monogamy of entanglement?

2 votes
1 answer
249 views

Diagonalising a fermionic Hamiltonian via Bogoliubov transformation

  • 3,270
2 votes
0 answers
60 views

Perturbation theory, Feynman diagrams and Dyson equation for non-instantaneous two-particles interaction

  • 71
1 vote
0 answers
31 views

What entanglement measures are known to satisfy entanglement monogamy?

1 vote
1 answer
96 views

Landau and Lifshitz - collisions between particles

  • 323
-2 votes
1 answer
197 views

Proof that entanglement "speed" cannot exceed the speed of light?

  • 5,579