User FriendlyLagrangian

94 votes

10 answers

14k views

Quantum Entanglement - What's the big deal?

Pete Oakey

1,524

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21 votes

5 answers

4k views

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

mathematical-physics mathematics foundations

Red Banana

503

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6 votes

2 answers

701 views

Examples of non-Hermitian Hamiltonians in open systems?

quantum-mechanics time-evolution dissipation open-quantum-systems

Henry Shackleton

870

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6 votes

2 answers

973 views

Fastest numerical method to solve Lindblad Master Equation?

quantum-mechanics schroedinger-equation computational-physics

Ronan

357

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6 votes

1 answer

187 views

Why is the electromagnetic duality an S-duality?

electromagnetism lagrangian-formalism string-theory field-theory duality

FriendlyLagrangian

1,474

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6 votes

2 answers

440 views

What makes electrons in the conduction band conductive?

electric-fields solid-state-physics electronic-band-theory

user316403

asked Oct 13, 2021 at 12:53

6 votes

3 answers

604 views

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

quantum-mechanics quantum-field-theory energy hilbert-space hamiltonian

FriendlyLagrangian

1,474

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5 votes

1 answer

1k views

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

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QuantumEyedea

3,071

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5 votes

1 answer

236 views

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

quantum-mechanics condensed-matter path-integral

P. C. Spaniel

3,739

asked May 17, 2019 at 23:31

5 votes

2 answers

281 views

Lindblad equation unitary term (in practice)

quantum-mechanics quantum-field-theory statistical-mechanics condensed-matter open-quantum-systems

FriendlyLagrangian

1,474

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5 votes

1 answer

269 views

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quantum-mechanics statistical-mechanics quantum-information entropy density-operator

FriendlyLagrangian

1,474

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5 votes

1 answer

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Why do we need the material derivative?

fluid-dynamics differentiation

Gold

30.1k

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4 votes

3 answers

7k views

On the completeness relation in Quantum Mechanics

quantum-mechanics wavefunction hilbert-space dirac-delta-distributions

TheQuantumMan

6,981

asked Mar 5, 2016 at 20:12

4 votes

0 answers

57 views

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

electromagnetism spacetime metric-tensor spacetime-dimensions

Trebor

427

asked Jun 13 at 5:39

4 votes

3 answers

2k views

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

general-relativity speed-of-light time-dilation

trigress09

51

asked Jun 12 at 20:21

3 votes

2 answers

69 views

Semi-group in quantum open systems

open-quantum-systems

Rob

156

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3 votes

0 answers

97 views

Vacuum state after diagonalising a free Hamiltonian?

quantum-mechanics quantum-field-theory statistical-mechanics condensed-matter operators

FriendlyLagrangian

1,474

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3 votes

1 answer

659 views

Is a quadratic Majorana Hamiltonian exactly solvable?

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Jian

995

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2 votes

0 answers

227 views

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

special-relativity quantum-mechanics

Yuzuriha Inori

1,867

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2 votes

1 answer

197 views

Do gravitational lenses act as prisms?

general-relativity optics visible-light frequency gravitational-lensing

Derek Seabrooke

448

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2 votes

2 answers

199 views

Proof of this version of Wick’s theorem?

quantum-mechanics operators correlation-functions wick-theorem

FriendlyLagrangian

1,474

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2 votes

1 answer

272 views

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quantum-mechanics quantum-field-theory condensed-matter quantum-information density-operator

FriendlyLagrangian

1,474

asked May 19, 2021 at 12:02

2 votes

0 answers

76 views

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

quantum-mechanics quantum-field-theory quantum-information quantum-entanglement quantum-computer

FriendlyLagrangian

1,474

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2 votes

1 answer

249 views

Diagonalising a fermionic Hamiltonian via Bogoliubov transformation

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Matt0410

3,270

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2 votes

0 answers

60 views

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condensed-matter feynman-diagrams perturbation-theory second-quantization

Gippo

71

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1 vote

0 answers

31 views

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quantum-mechanics quantum-information quantum-entanglement quantum-computer

FriendlyLagrangian

1,474

asked Jul 27, 2021 at 12:17

1 vote

1 answer

96 views

Landau and Lifshitz - collisions between particles

homework-and-exercises newtonian-mechanics conservation-laws collision scattering

EB97

323

asked Dec 9, 2021 at 0:17

-2 votes

1 answer

197 views

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

special-relativity speed-of-light quantum-entanglement causality

riemannium

5,579

asked Jul 31, 2019 at 11:58

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Quantum Entanglement - What's the big deal?

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

Examples of non-Hermitian Hamiltonians in open systems?

Fastest numerical method to solve Lindblad Master Equation?

Why is the electromagnetic duality an S-duality?

What makes electrons in the conduction band conductive?

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

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

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

Lindblad equation unitary term (in practice)

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

Why do we need the material derivative?

On the completeness relation in Quantum Mechanics

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

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

Semi-group in quantum open systems

Vacuum state after diagonalising a free Hamiltonian?

Is a quadratic Majorana Hamiltonian exactly solvable?

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

Do gravitational lenses act as prisms?

Proof of this version of Wick’s theorem?

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

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

Diagonalising a fermionic Hamiltonian via Bogoliubov transformation

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

What entanglement measures are known to satisfy entanglement monogamy?

Landau and Lifshitz - collisions between particles

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