Questions tagged [feyncalc]
Questions about Mathematica packages for High Energy Physics and Quantum Field Theory, e.g. FeynCalc, FeynArts, FormCalc, FeynRules, HEPMath, Package-X, LoopTools, Tracer etc.
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TensorD extension pack for the Package-X
Does anyone have a copy of TensorD extension pack for the Package-X?
The Package-X is a Mathematica package for QFT calculations. Unfortunately, it is no longer developed and the official website (...
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Is MomentumCombine the inverse of ExpandScalarProduct?
My question (perhaps naive) is the following: The documentation says that MomentumCombine is the inverse operation of ...
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How to simplify the results of squared amplitude calculations in FeynCalc?
I want to calculate the squared amplitude of the Feynman diagram of double-pion photoproduction using FeynCalc package. Here is the code I created:
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Feyncalc computations using parallel computing (multicore computing)?
I'm doing very long computations with FeynCalc (they're dimensional regularizations of diagrams with a lot of D-dimensional metric and D-dimensional momentum contractions like Contract[ MTD[$\alpha,\...
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FeynCalc TID PaVeLimitTo4 option leads to divergence
I'm trying to compute the Higgs to gluon pair decay at 1-loop using Feyncalc and FeynHelper (to connect with Package-X).
I first define variables and loop part as:
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The mcc command generated program segfaults
I am trying to get FormCalc to work with FeynArts, the only problem is that the ReadForm program that is required for FormCalc to work compiles fine but segfaults...
I am using Mathematica 14, should ...
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In Feyncalc what is the purpose of DiracChainEvalSign and why does FCFAconvert fail if it is present?
I have run into this issue and I am not sure how to proceed, I cannot find where DiracChainEvalSign enters into diracObjectsEval which triggers the error in the library source code (see here). Any ...
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How to convert xAct output to FeynCalc input?
For the packages xAct and Feyncalc, is there a way to convert xAct output into Feyncalc input? I have an expression of one rank and four rank tensors as an output from xAct. The number of terms is ...
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How to change FeynArts Paint style settings?
I'm a Mathematica stylesheet enthusiast. I love using beautiful stylesheet instead of the default one, such as Dracular. I'm also a physics researcher on scattering amplitudes, which forces me to use ...
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How to output TeX with FeynArts?
I've recently installed FeynArts since I can use mathematica to generate topologies and it comes with a set of commands to make diagrams in LaTeX. However, nowhere in the manual can I find a command ...
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FeynCalc Phi4 example error with FeynRules
I'm starting on FeynCalc and was trying to run through a few examples coming with the package. For the ones of which the models are generated by FeynRules, it doesn't work out well. (When the model is ...
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FeynCalc error: FeynCalc`ComplexConjugate`Private`diracChainCC?
I am trying to evaluate an amplitude. It is an electron-positron annihilation into $W^{-}W^{+}$ bosons. I am only considering the channel for a photon mediator, that is, $e^{-}e^{+} \rightarrow \gamma ...
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Problems in generating example models of FeynCalc
I'm getting started with FeynCalc and FeynArts, so I tried to run some of the examples they give you. Everything works fine, except for the ones which require to generate a model using the scripts in ...
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Simplification of Momentums in FeynCalc
I have a little problem involving the following contraction in FeynCalc:
$$\frac{k^{\delta}k^{\sigma}}{k^2}$$
By hand one would lower $\sigma$ and contract with the other momentum to cancel $k^2$, ...
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FeynCalc Kronecker delta contraction
I want to simplify some expressions like a[i]*b[i]*KD[i,j]. After contraction, it should be a[j]*b[j], but it seems that FeynCalc cannot handle more than 3 of the same CartesianIndices.
I know for ...
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