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What is the meaning of the "$i$" featuring in the commutation relations of the Galilean/Poincare group?

score 63 · Answer 1 · 2026-03-26 09:51:26

63

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What is the meaning of the "$i$" featuring in the commutation relations of the Galilean/Poincare group?

Published on 26 Mar 2026 - 9:51

score 127 · Answer 2 · 2026-03-22 21:32:23

127

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Does the singularities of black holes not being simply connected imply that the universal coverings of quantum field theory fail?

Published on 22 Mar 2026 - 21:32

score 66 · Answer 3 · 2026-03-26 17:32:14

66

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Difference between $(\frac12, \frac12)$ and $(\frac12,0) + (0,\frac12)$ representations?

Published on 26 Mar 2026 - 17:32

score 1.3k · Answer 4 · 2026-03-25 09:27:06

1.3k

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score 104 · Answer 5 · 2026-03-25 05:28:34

104

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score 62 · Answer 6 · 2026-03-25 07:49:22

62

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score 63 · Answer 7 · 2018-05-16 15:33:02

63

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score 89 · Answer 8 · 2026-03-24 23:45:03

89

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score 56 · Answer 11 · 2026-03-25 10:59:01

56

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Prove that $\frac{d}{d x}\log(x+io)=\text{vp}\frac{1}{x}-i\pi \delta(x)$ in the sense of distribution

Published on 25 Mar 2026 - 10:59

score 2.7k · Answer 12 · 2026-03-24 23:51:07

2.7k

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Published on 24 Mar 2026 - 23:51

score 978 · Answer 13 · 2026-03-25 01:24:01

978

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score 217 · Answer 14 · 2018-05-23 16:10:56

217

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Published on 23 May 2018 - 16:10

score 70 · Answer 15 · 2018-05-28 07:25:34

70

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Limits of a field point a distance z from a line charge

Published on 28 May 2018 - 7:25

List Question

What is the meaning of the "$i$" featuring in the commutation relations of the Galilean/Poincare group?

Does the singularities of black holes not being simply connected imply that the universal coverings of quantum field theory fail?

Difference between $(\frac12, \frac12)$ and $(\frac12,0) + (0,\frac12)$ representations?

Use linear regression to find $k$ and $C$ for $PV^k = C$

Trajectory of kicked ball

What's the geometry of a classical multiparticle system in physics?

Finding a sum of force vectors

A friendly introduction to Hilbert's sixth problem with special focus in its meaning and issues

The rotating wheels problem?

Logic of Euler-Lagrange Equation

Prove that $\frac{d}{d x}\log(x+io)=\text{vp}\frac{1}{x}-i\pi \delta(x)$ in the sense of distribution

What is the idea behind zeta function regularization?

Bloch's theorem in one dimension, confusion about proof

The velocity of an object: $\frac{dv}{dt} = -kv^n$, k > 0, n constant. [Engineering Differential Equations Question]

Limits of a field point a distance z from a line charge

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