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Tim
  • Member for 7 years, 8 months
  • Last seen more than 2 years ago
  • Berlin
23 votes
3 answers
5k views

Is there a mathematical reason for the Lagrangian to be Lorentz invariant?

18 votes
3 answers
2k views

Why is the "actual" gauge group of the standard model $SU(3) \times SU(2) \times U(1) /N$?

18 votes
2 answers
2k views

Vector spaces for the irreducible representations of the Lorentz Group

16 votes
1 answer
1k views

Why is the strong CP term $ \theta \frac{g^2}{32 \pi^2} G_{\mu \nu}^a \tilde{G}^{a, \mu \nu}$ never considered for $SU(2)$ or $U(1)$ interactions?

15 votes
1 answer
2k views

Do electrons oscillate into muons just like electron-neutrinos into muon-neutrinos?

15 votes
1 answer
2k views

Why do we require quantum fields to vanish at infinity?

11 votes
1 answer
1k views

How can we measure chirality in experiments?

9 votes
2 answers
399 views

If $v_{a \dot{b}}$ transforms like a four-vector, what does $v_{a}^{\dot{b}}$ describe?

8 votes
1 answer
559 views

Where does in GUT symmetry breaking $U(1)$ come from?

7 votes
2 answers
2k views

Why does the minus sign in the Minkowski metric mean that nothing can move backwards in time?

5 votes
2 answers
879 views

Under what representation do the Christoffel symbols transform?

4 votes
1 answer
919 views

Are there any good books about Grand Unified Theories?

4 votes
2 answers
715 views

Is $SU(2)$ really broken by the Higgs VEV or just hidden?

4 votes
1 answer
430 views

The Einstein-Cartan equation as the "living heart of gravity"?

4 votes
2 answers
1k views

Why is the $(\frac{1}{2},\frac{1}{2})$ representation of the Lorentz group realized as the vector space of Hermitian $2\times 2$ matrices?

1 vote
0 answers
56 views

Name for the transformation into an accelerated frame?

1 vote
1 answer
405 views

Covariant formulation of physical equations?

1 vote
2 answers
1k views

The Lie algebra of the Lorentz group is $su(2) \oplus su(2)$. Is there a similar relation for the algebra of the Poincare group?

1 vote
1 answer
155 views

What is the current state of axion research theoretically?

1 vote
0 answers
42 views

How can family symmetries explain the 3 generations and their mixing?

1 vote
0 answers
68 views

How to get from $E_8 \rightarrow E_7 \rightarrow E_6 \rightarrow ...$