Name: Vladyslav Shtabovenko (email_not_shown)
Date: 01/27/15-12:34:59 PM Z


Hi,

thanks for reporting this, but FeynCalc 8.1.0 is actually outdated. In
FeynCalc 8.2 the result is correct. Your code

g5 = -(I/24) LCD[\[Mu], \[Nu], \[Rho], \[Alpha]] GAD[\[Mu], \[Nu], \
\[Rho], \[Alpha]] // FCI
g5p = -(I/
       24) LCD[\[Mu]1, \[Nu]1, \[Rho]1, \[Alpha]1] GAD[\[Mu]1, \[Nu]1, \
\[Rho]1, \[Alpha]1] // FCI
g52 = Tr[g5.g5p]l

returns 4, as it should.

It there something preventing you from switching to the version 8.2?

Cheers,
Vladyslav

On 27/01/15 11:30, max wrote:
> Hi,
>
> I found there is a bug in FeynCalc when I running
>
> In[174]:= g5 = -(I/24)
> LCD[\[Mu], \[Nu], \[Rho], \[Alpha]].GAD[\[Mu], \[Nu], \[Rho], \
> \[Alpha]] // FCI
>
> Out[174]= -(1/24) I \[Epsilon]^(\[Mu]\[Nu]\[Rho]\[Alpha]).\[Gamma]^\[Mu].\[Gamma]^\[Nu].\[Gamma]^\[Rho].\[Gamma]^\[Alpha]
>
> In[178]:= g5p = -(I/24)
> LCD[\[Mu]1, \[Nu]1, \[Rho]1, \[Alpha]1].GAD[\[Mu]1, \[Nu]1, \
> \[Rho]1, \[Alpha]1] // FCI
>
> Out[178]= -(1/24) I \[Epsilon]^(\[Mu]1\[Nu]1\[Rho]1\[Alpha]1).\[Gamma]^\[Mu]1.\[Gamma]^\[Nu]1.\[Gamma]^\[Rho]1.\[Gamma]^\[Alpha]1
>
> In[179]:= g52 = Factor2[Tr[g5.g5p]]
>
> Out[179]= -(1/48) D (D^3 (-HighEnergyPhysics`fctools`DiracSimplify`Private`dS())-7 D^3+48 D^2-88 D+48)
>
> There is the "-HighEnergyPhysics`fctools`DiracSimplify`Private`dS())", which is not supposed to emerge.
>
> My version of FeynCalc is 8.1.0 in Linux.
>
> All the best
>
> Max
>



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