All Questions
27
questions
2
votes
1
answer
127
views
Mathematica package for validating effective string theory solution
I am asking for Mathematica package that given an input of:
symmetric matrix $G_{\mu\nu}$, antisymmetric matrix $B_{\mu\nu}$ and a scalar function $\Phi$
will check whether it is a solution to the one-...
2
votes
0
answers
103
views
How to effectively substitute variables in xAct?
I am trying to find the gauge field equation by varying the Born-Infeld Action with the help of xact package. I use the following ...
- 2,433
3
votes
1
answer
142
views
Varying Einstein-Hilbert action through xAct gives extra terms
I am trying to find the associated field equation by varying this action:
$$S=\int d^4x \sqrt{-g}(\kappa \mathcal{R}+\Lambda)$$
This should give me the below field equation when I vary above w.r.t the ...
- 2,433
4
votes
1
answer
1k
views
What are some Mathematica packages used for general relativity?
Could you suggest any Mathematica packages that are used for General relativity calculations? Id like to write code to solve the Schwarzchild Lagrangian equation.
2
votes
0
answers
122
views
Tracing the phases (i.e. the minima) of a potential
Is there a Mathematica package to trace the minima of a potential as a function of some parameter, returning its phase structure?
Working with particle physics models (in the context of cosmology and ...
- 21
1
vote
0
answers
106
views
Error message installing Ricci
I just started using Mathematica. With the goal of solving
a Loop integrals over a scalar gravity interaction. For the tensor calculus necessary i wanted to use, Ricci. https://sites.math.washington....
- 21
2
votes
1
answer
695
views
Simplifying quantum operators (ladder operators with multiple modes)
Similar to this question, I am interested in working with an implementation of quantum ladder operators.
I've been trying to use this "Quantum Mathematica Package" to solve some lengthy ...
- 910
1
vote
1
answer
806
views
Where I can find RGTC package? (2021 version)
I am not being able to find the RGTC package for Mac. I followed the instructions of this Mathematica Stack Exchange answer, however, the documentation notebook says "Not Found".
- 135
0
votes
0
answers
417
views
Easiest way to export amplitude from FeynArts to FeynCalc
I am having trouble calculating some unpolarized squared amplitudes with FeynArts+FormCalc and want to use FeynCalc to manually handle the amplitudes calculated by FeynArts.
What is the easiest way to ...
- 405
2
votes
0
answers
49
views
OscillatorStrength[Helium] and OscillatorStrength[Rubidium] do not return results
I am new to working with the Resonance Absorption Lines Pacgage
<< ResonanceAbsorptionLines`
and trying to write code using the OscillatorStrength command. ...
- 161
2
votes
1
answer
631
views
How can I install SNEG Library package on Windows?
I want to save my time doing second quantization calculation, so I tried to install SNEG package. (http://nrgljubljana.ijs.si/sneg/)
But in the website I only founnd ways to install the package on ...
- 63
7
votes
1
answer
2k
views
Distinguish FeynRules, FeynCalc, FeynArts, FormCalc and LoopTools
I am totally confused: I can't distinguish the packages FeynRules, FeynCalc, FeynArts, FormCalc, LoopTools properly.
Once I installed FeynRules I think. It seems to include the packages FeynCalc and ...
- 73
0
votes
2
answers
1k
views
Where can I find the package RGTC?
I am unable to find the package RGTC which is the prerequisite for the package Surface Charges that I require. All places I searched for only provide one download link which gives Error 404. Can I ...
11
votes
1
answer
1k
views
3D rigid body physics engine
Is there a package in Mathematica that will allow me to simulate collisions of 3d rigid bodies?
If not, what known libraries could I use and how?
For example, one problem I want to simulate is a ...
- 2,217
2
votes
0
answers
186
views
Antiparticles in Feynrules Lagrangian
I am trying to implement a simple extension of the SM to Feynrules, generating the Lagrangian in a Mathematica notebook file. I am wondering about the following:
Is there a way to explicitly use the ...
- 21