Skip to main content

packages - FeynArts not working properly



So I have installed all FeynArts folders (from 3.5 to 3.7) with FeynCalc 8.0.1., and none of it is working properly :\


First I load the path to specific FeynArts package (3.5 for instance), then, by:


<< HighEnergyPhysics`FeynCalc`;

I load FeynCalc, and he says


Loading FeynCalc from C:\Users\*****\AppData\Roaming\Mathematica\Applications\HighEnergyPhysics
FeynCalc 8.1.0 For help, type ?FeynCalc, open FeynCalcRef8.nb or visit www.feyncalc.org
Loading FeynArts, see www.feynarts.de for documentation
FeynArts 3.5 patched for use with FeynCalc


So everything seems nice, right? Wrong!


I even load FeynArts package, and no errors. But when I want to initialize the proper model I get:


In[9]:= InitializeModel[SM]

During evaluation of In[9]:= 

During evaluation of In[9]:= loading generic model file C:\Users\*****\AppData\Roaming\Mathematica\Applications\HighEnergyPhysics\FeynArts-3.5\Models\Lorentz.gen

During evaluation of In[9]:= TagSetDelayed::tagnf: Tag FourVector not found in \!
\(TraditionalForm\`\(-\(TraditionalForm\`mom_\)\^\(TraditionalForm\`\(TraditionalForm\`\(Pattern[\(\(mu___, _\)\)]\)\)\)\)\)

. >>

During evaluation of In[9]:= Pattern::patvar: First element in pattern Pattern[b_,_] is not a valid pattern name. >>

During evaluation of In[9]:= Pattern::patvar: First element in pattern Pattern[b_,_] is not a valid pattern name. >>

Out[9]= $Aborted

And I can't do anything! I can plot topology, but I can't insert fields. I've been doing everything by the book :\ What seems to be wrong? :\



Answer




I've just uploaded a new version which again should support loading FeynArts, so that FeynCalc and FeynArts can be used from the same session - which I personally find very convenient.


See


http://www.feyncalc.org/download/


and


http://www.feyncalc.org/cgi-bin/diary.pl


FeynArts-3.7 is bundled with the release, so you can simply load FeynCalc with


$LoadPhi = True;
    $LoadFeynArts = True;
<< HighEnergyPhysics`FeynCalc`;


The first time you do this, FeynArts will be patched to avoid name clashes etc. After that you can in principle load FeynCalc+FeynArts without loading PHI, but then you should manually do


SetOptions[FourVector, FeynCalcInternal -> False];

before


InitializeModel[SM]

Otherwise FeynArts will complain and not load correctly


because of


FourVector /: -FourVector[mom_, mu___] := FourVector[Expand[-mom], mu]


in "Lorentz.gen".


Comments

Post a Comment

Popular posts from this blog

functions - Get leading series expansion term?

Given a function f[x] , I would like to have a function leadingSeries that returns just the leading term in the series around x=0 . For example: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x)] x and leadingSeries[(1/x + 2 + (1 - 1/x^3)/4)/(4 + x)] -(1/(16 x^3)) Is there such a function in Mathematica? Or maybe one can implement it efficiently? EDIT I finally went with the following implementation, based on Carl Woll 's answer: lds[ex_,x_]:=( (ex/.x->(x+O[x]^2))/.SeriesData[U_,Z_,L_List,Mi_,Ma_,De_]:>SeriesData[U,Z,{L[[1]]},Mi,Mi+1,De]//Quiet//Normal) The advantage is, that this one also properly works with functions whose leading term is a constant: lds[Exp[x],x] 1 Answer Update 1 Updated to eliminate SeriesData and to not return additional terms Perhaps you could use: leadingSeries[expr_, x_] := Normal[expr /. x->(x+O[x]^2) /. a_List :> Take[a, 1]] Then for your examples: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x), x] leadingSeries[Exp[x], x] leadingSeries[(1/x + 2 + (1 - 1/x...
Post a Comment
Read more

How to thread a list

I have data in format data = {{a1, a2}, {b1, b2}, {c1, c2}, {d1, d2}} Tableform: I want to thread it to : tdata = {{{a1, b1}, {a2, b2}}, {{a1, c1}, {a2, c2}}, {{a1, d1}, {a2, d2}}} Tableform: And I would like to do better then pseudofunction[n_] := Transpose[{data2[[1]], data2[[n]]}]; SetAttributes[pseudofunction, Listable]; Range[2, 4] // pseudofunction Here is my benchmark data, where data3 is normal sample of real data. data3 = Drop[ExcelWorkBook[[Column1 ;; Column4]], None, 1]; data2 = {a #, b #, c #, d #} & /@ Range[1, 10^5]; data = RandomReal[{0, 1}, {10^6, 4}]; Here is my benchmark code kptnw[list_] := Transpose[{Table[First@#, {Length@# - 1}], Rest@#}, {3, 1, 2}] &@list kptnw2[list_] := Transpose[{ConstantArray[First@#, Length@# - 1], Rest@#}, {3, 1, 2}] &@list OleksandrR[list_] := Flatten[Outer[List, List@First[list], Rest[list], 1], {{2}, {1, 4}}] paradox2[list_] := Partition[Riffle[list[[1]], #], 2] & /@ Drop[list, 1] RM[list_] := FoldList[Transpose[{First@li...
Post a Comment
Read more

front end - keyboard shortcut to invoke Insert new matrix

I frequently need to type in some matrices, and the menu command Insert > Table/Matrix > New... allows matrices with lines drawn between columns and rows, which is very helpful. I would like to make a keyboard shortcut for it, but cannot find the relevant frontend token command (4209405) for it. Since the FullForm[] and InputForm[] of matrices with lines drawn between rows and columns is the same as those without lines, it's hard to do this via 3rd party system-wide text expanders (e.g. autohotkey or atext on mac). How does one assign a keyboard shortcut for the menu item Insert > Table/Matrix > New... , preferably using only mathematica? Thanks! Answer In the MenuSetup.tr (for linux located in the $InstallationDirectory/SystemFiles/FrontEnd/TextResources/X/ directory), I changed the line MenuItem["&New...", "CreateGridBoxDialog"] to read MenuItem["&New...", "CreateGridBoxDialog", MenuKey["m", Modifiers-...
Post a Comment
Read more