user avatar
user avatar
user avatar
Frederic Brünner
  • Member for 10 years, 8 months
  • Last seen more than 2 years ago
133 votes
1 answer
7k views

Linear sigma models and integrable systems

  • 1,329
116 votes
1 answer
7k views

Superfields and the Inconsistency of regularization by dimensional reduction

  • 3,443
88 votes
6 answers
14k views

What is more fundamental, fields or particles?

79 votes
5 answers
11k views

How literally should you take "The Higgs boson gives other particles mass"?

  • 3,931
62 votes
5 answers
6k views

What exactly is regularization in QFT?

  • 54.8k
58 votes
7 answers
11k views

Do electrons have shape?

58 votes
6 answers
53k views

Why does cold metal seem colder than cold air?

45 votes
0 answers
2k views

$\operatorname{O}(N)$ sigma model at large $N$

  • 805
45 votes
5 answers
7k views

Density matrix formalism

45 votes
10 answers
5k views

Are vacuum fluctuations really happening all the time?

  • 2,950
44 votes
7 answers
4k views

Why fermions have a first order (Dirac) equation and bosons a second order one?

41 votes
0 answers
1k views

Positivity for the level of Chern-Simons theory

39 votes
3 answers
9k views

Noether's theorem and gauge symmetry

  • 671
38 votes
2 answers
11k views

Wick rotation in field theory - rigorous justification?

37 votes
3 answers
9k views

Do photons occupy space?

36 votes
7 answers
13k views

How does "warp drive" not violate Special Relativity causality constraints?

35 votes
5 answers
4k views

Is the graviton hypothetical?

  • 10.7k
34 votes
3 answers
4k views

Can all fundamental forces be fictitious forces?

33 votes
2 answers
8k views

Energy-Momentum Tensor in QFT vs. GR

  • 2,144
32 votes
2 answers
4k views

What does it mean that there is no mathematical proof for confinement?

31 votes
2 answers
4k views

What the heck is the sigma (f0) 600?

30 votes
2 answers
10k views

Why are anti-de Sitter spaces so interesting when we believe the universe is expansionary?

  • 1,434
30 votes
2 answers
5k views

Difference between regularization and renormalization?

  • 1,128
29 votes
3 answers
1k views

Why are only linear representations of the Lorentz group considered as fundamental quantum fields?

  • 18.4k
29 votes
4 answers
4k views

What is the meaning of a state in QFT?

  • 1,026
28 votes
1 answer
4k views

Reflection positivity in general

  • 3,552
28 votes
4 answers
10k views

Why you need a graviton when you have the Higgs boson?

27 votes
3 answers
4k views

The path integral and Feynman diagrams

  • 15.8k
27 votes
2 answers
954 views

Finding the vacuum which breaks a symmetry

  • 387
26 votes
1 answer
999 views

What is the status of Witten's and Vafa's argument that the QCD vacuum energy is a minimum for zero $\theta$ angle?

  • 3,608
1
2 3 4 5
19