# Questions tagged [field-theory]

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### Solving PDEs In Tensor Form

I have a set of field equations (PDEs) expressed tensor form that I derived using xAct and xTensor. Is there any function that would allow me to put the full tensor form of the field equations as an ...
234 views

### Field axioms in Mathematica

I don't understand the result of AxiomaticTheory["FieldAxioms", "Axioms"] ...
132 views

### How to fix these warnings from an NDSolve code?

The following code works but it give several warnings that makes me feel nervous about the reliability and accuracy of the output: NDSolve: Warning: estimated initial error on the specified spatial ...
126 views

### Why is there an error about division by 0?

I'm converting all of my old Mathematica 7.0 codes to my new Mathematica 13.2, and I'm struggling with some issues I didn't encounter with version 7.0. The following code is giving me a headache, ...
156 views

### How to know which is value for field extension

I can convert $\sqrt{5}$ into a AlgebraicNumber: ToNumberField[Sqrt[5]] ...
1 vote
104 views

### How can I do the same thing with mathematica? [duplicate]

I would like to do the same thing that we can see from the picture but with Mathematica. The problem is that I am only an high-school student which try to do this. It would be appreciated if it could ...
192 views

384 views

### How to define tensors similar to Riemann tensor in xAct xTensor xTras

I'm working on a project where we deal with objects very similar to Riemann tensor. In fact they are Christoffel symbols for higher spins. I'm using xTras for modeling problems in wolfram mathematica. ...
1k views

459 views

### NDSolve: method of lines: unexpected error: insufficient boundary conditions

As a test of my ability to master the Method of Lines I tried to NDSolve the PDE's system \partial_t \varphi = \varpi\qquad\partial_t\varpi=\frac{1}{r}\partial^...
I've symmetric tensor $h(z)$ with rank $s$. Instead of writing symmetric tensor with its components I use the following notation \$h^{(s)}(z;a) = \sum_{\mu_i}(\prod_{i=1}^{s}a^{\mu_i})h^{(s)}_{\mu_1\...