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proton
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307 votes
11 answers
45k views

What experiment would disprove string theory?

  • 3,649
259 votes
11 answers
61k views

Don't heavier objects actually fall faster because they exert their own gravity?

  • 2,828
232 votes
20 answers
38k views

What exactly is a photon?

116 votes
19 answers
121k views

Books for general relativity

111 votes
4 answers
15k views

Intuitively, why are bundles so important in Physics?

  • 29.5k
88 votes
12 answers
14k views

What is spontaneous symmetry breaking in quantum systems?

81 votes
8 answers
7k views

Why is the application of probability in Quantum Mechanics fundamentally different from application of probability in other areas?

  • 4,866
77 votes
1 answer
9k views

Does Feynman's derivation of Maxwell's equations have a physical interpretation?

69 votes
2 answers
9k views

Does the new finding on "reversing a quantum jump mid-flight" rule out any interpretations of QM?

  • 3,060
58 votes
7 answers
5k views

What's the physical meaning of the statement that "photons don't have positions"?

  • 95.3k
56 votes
5 answers
19k views

What does it mean for a Hamiltonian or system to be gapped or gapless?

  • 1,423
54 votes
7 answers
15k views

A No-Nonsense Introduction to Quantum Field Theory

51 votes
7 answers
6k views

What was Feynman's "much better way of presenting the electrodynamics" -- which did **not** appear in the Feynman lectures?

  • 538
47 votes
8 answers
35k views

Books for Condensed Matter after Ashcroft/Mermin

  • 3,676
46 votes
2 answers
12k views

Introduction to AdS/CFT

43 votes
14 answers
24k views

What is entropy really?

40 votes
3 answers
6k views

What role does "spontaneous symmetry breaking" play in the "Higgs Mechanism"?

37 votes
2 answers
4k views

What's the deal with momentum in the infinite square well?

35 votes
7 answers
7k views

Reading list in topological QFT

35 votes
7 answers
7k views

What is Quantum Mechanics really about? [duplicate]

  • 29.5k
32 votes
4 answers
5k views

Physical and Geometrical interpretation of Differential Forms

  • 29.5k
30 votes
2 answers
26k views

How to take partial trace?

28 votes
4 answers
4k views

Could the Periodic Table have been done using group theory?

28 votes
2 answers
9k views

Topological Charge. What is it Physically?

  • 353
27 votes
5 answers
5k views

Simple models that exhibit topological phase transitions

  • 5,185
27 votes
4 answers
12k views

Lagrangian to Hamiltonian in Quantum Field Theory

  • 1,697
26 votes
3 answers
3k views

Ignorance in statistical mechanics

26 votes
2 answers
5k views

How are bound states handled in QFT?

  • 25.7k
25 votes
5 answers
14k views

Chemical potential

  • 4,371
22 votes
3 answers
1k views

How to rigorously argue that the superposition state is unstable in spontaneously symmetry breaking case

  • 1,909