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Tim

Berlin

Student of Physics

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26 votes

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

special-relativity lagrangian-formalism symmetry hamiltonian-formalism asked Dec 1, 2014 at 15:52
physics.stackexchange.com

20 votes

Vector spaces for the irreducible representations of the Lorentz Group

special-relativity group-theory representation-theory lorentz-symmetry group-representations asked Nov 29, 2014 at 12:05
physics.stackexchange.com

18 votes

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

standard-model gauge-theory group-theory fermions group-representations asked Apr 16, 2015 at 18:00
physics.stackexchange.com

17 votes

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?

quantum-field-theory lagrangian-formalism quantum-chromodynamics strong-force axion asked Apr 16, 2015 at 7:29
physics.stackexchange.com

15 votes

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

quantum-mechanics quantum-field-theory neutrinos asked Apr 15, 2015 at 7:29
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15 votes

Why do we require quantum fields to vanish at infinity?

quantum-field-theory boundary-conditions asked Jan 23, 2015 at 8:59
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11 votes

How can we measure chirality in experiments?

quantum-field-theory spin group-theory chirality helicity asked Jan 24, 2015 at 8:54
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9 votes

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

special-relativity metric-tensor causality lorentz-symmetry asked Apr 3, 2015 at 15:58
physics.stackexchange.com

9 votes

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

special-relativity group-theory tensors representation-theory spinors asked Jan 18, 2015 at 14:47
physics.stackexchange.com

9 votes

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

group-theory lie-algebra symmetry-breaking beyond-the-standard-model grand-unification asked Apr 16, 2015 at 20:22
physics.stackexchange.com

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