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21 votes
2 answers
3k views

What is the connection between Conformal Field Theory and Renormalization group in QFT?

18 votes
4 answers
11k views

Difficulties with bra-ket notation

18 votes
2 answers
4k views

Constraints of relativistic point particle in Hamiltonian mechanics

12 votes
2 answers
5k views

What is conformal gauge?

9 votes
1 answer
598 views

Symmetries in physics

9 votes
2 answers
793 views

Violation of Lorentz invariance (Lagrangian for particle)

8 votes
1 answer
607 views

Two expressions for topological instanton number

7 votes
2 answers
8k views

Global phase symmetry for complex scalar field theory

6 votes
0 answers
222 views

't Hooft many instanton solutions

5 votes
0 answers
601 views

Free path distribution

5 votes
1 answer
281 views

Constructing the space of quantum states

5 votes
0 answers
200 views

Functional integral aproach for Feynman rules [duplicate]

4 votes
2 answers
3k views

Lorentz invariance of the action for free relativistic particle

4 votes
1 answer
412 views

Derivation of matrix element

4 votes
2 answers
396 views

Domain walls intersection

3 votes
2 answers
721 views

"Inverted" quantum oscillator

2 votes
0 answers
157 views

When can I use semiclassical approximation? [closed]

1 vote
3 answers
727 views

Lorentz symmetry and Noether's theorem