# Questions tagged [special-relativity]

The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.

12,066 questions
Filter by
Sorted by
Tagged with
201 views

### What is the covariant version of the dipole moment?

Magnetic dipoles in a rest frame behave as a mixture of dielectric dipoles and magnetic dipoles in another moving frame. However this is sometimes controversial due to Mansuripur's paradox (see ...
• 3,968
1 vote
39 views

### What's the difference between Lorentz transformation properties of Hermitian and Dirac adjoint lepton doublets?

If the lepton doublet transforms like a left-handed Weyl spinor under Lorentz transformations, $$L \longrightarrow exp\left[\frac{1}{2}(i\theta_j\sigma^j - \beta_j\sigma^j)\right]L = \Lambda_{sL}L,$$...
• 63
65 views

### Dimension of a vector space of all tensors of rank $(k,l)$ in 4D

Dual vector space is the set of all linear functionals defined on a given vector space. The vector space and dual vector space is isomorphic and hence have the same dimension. A rank $(k,l)$ tensor is ...
• 260
114 views

1 vote
71 views

• 1,515
127 views

### Question about Time Dilation [closed]

I was studying about Time dilation and I wondered, does Time seem less for a moving body, or does it seem less for a resting body, both relative to each other, or does both occur at same time? Meaning ...
1 vote
86 views

### Is Time Dilation Directional Under Special Relativity, What Fundamental Concept Am I Missing Here?

I'm starting college this summer and trying to learn physics. Special relativity is new. I thought I was getting a handle on it but nope... I'm just trying to nail the concepts down to give the math ...
1 vote
So when we talk about scalar fields in spacetime, we set that $\phi(x) \rightarrow \Lambda\phi(x)\equiv\phi'(x').$ So that in the same event, the field value is the same for different frames \$\phi'(...