# Search Results

1. Post

### invariance in relativity

You cannot make this assumption.
Post by: Orodruin, Nov 17, 2017 at 12:04 AM in forum: Introductory Physics Homework
2. Post

### invariance in relativity

Post by: Orodruin, Nov 16, 2017 at 11:56 PM in forum: Introductory Physics Homework
3. Post

### A Global solution to parallel transport equation?

This is the point. You can only draw this conclusion if the above is true for all vectors. For a single vector field, it is sufficient that the...
Post by: Orodruin, Nov 16, 2017 at 11:48 PM in forum: Special and General Relativity
4. Post

### Find dy/dx, which way should I use?

It does not matter when you differentiate as long as the equality you are differentiating is equivalent to the original one.
Post by: Orodruin, Nov 16, 2017 at 12:51 PM in forum: Calculus and Beyond Homework
5. Post

### I Non-coordinate bases

If the basis is a basis of smooth vector fields.
Post by: Orodruin, Nov 16, 2017 at 8:35 AM in forum: Special and General Relativity
6. Post

### I Requirements for pair production

A photon cannot spontaneously pair produce an electron-positron pair as that would violate the conservation of 4-momentum (i.e., energy and...
Post by: Orodruin, Nov 16, 2017 at 6:40 AM in forum: Quantum Physics
7. Post

### I Non-coordinate bases

You do not represent points in bases. Points are not vectors.
Post by: Orodruin, Nov 16, 2017 at 5:17 AM in forum: Special and General Relativity
8. Post

### A Global solution to parallel transport equation?

It is unclear what you are trying to say. A parallel field $X$ is a field such that $\nabla_Y X = 0$ for all vector fields $Y$. Such a field...
Post by: Orodruin, Nov 16, 2017 at 3:01 AM in forum: Special and General Relativity
9. Post

### A Global solution to parallel transport equation?

It means you cannot find a set of global vector fields that are parallel and form a complete basis of the tangent space at each point. A priori,...
Post by: Orodruin, Nov 16, 2017 at 2:01 AM in forum: Special and General Relativity
10. Post

### Fock states as integrals of coherent states

When $k = n$ you cannot do the integral like that. When $k \neq n$ it is zero.
Post by: Orodruin, Nov 15, 2017 at 6:50 AM in forum: Advanced Physics Homework
11. Post

### The addition of 3 spins

In order to do that you need to know which state is the $|1/2,1/2\rangle$ state. Which is it?
Post by: Orodruin, Nov 15, 2017 at 5:47 AM in forum: Advanced Physics Homework
12. Post

### Fock states as integrals of coherent states

You cannot sandwich the expression between $\langle n|$ and $|n\rangle$, it is a state vector! Instead, perform the integral over $\theta$.
Post by: Orodruin, Nov 15, 2017 at 5:40 AM in forum: Advanced Physics Homework