Cheaper colour sum: DDM basis, Kleiss-Kuijf flows, reflection folding, BLAS, and the same for madmatrix - #60

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claude/dixon-maltoni-gluon-basis-69e1d7

Commits on Aug 5, 2026

exploit index-permutation symmetry in the color basis and color matrix

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2f8aeaa

Commits on Aug 6, 2026

index the JAMP matrix instead of scanning every column of it

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dab4a8d
build the powers of Nc in the JAMP coefficients once per power

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0911a2d
encode the color matrix by one line per orbit, and split the contraction sum

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390c493
look for the JAMP sub-expressions by orbits of the color basis symmetry

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b66e13e
carry the color flow factors as powers of i, not as signs

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bb8b465
write the color flow definitions out as tables, keeping the orbit optimisation

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e4f76be
finish the color flow optimisation with the plain scan

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d21bdad
keep whichever of the two optimisations is the shorter, on small processes

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7c659b5
use the orbit equivariant optimisation for madevent too

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d253574
read the amplitudes into a buffer so madevent can use the tables too

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c840ec0
find the reversal symmetry of the color basis and fold the color matrix on it

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018e56b
sum |M|^2 over one color flow per reversal pair

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04ce4e0
work out one color flow per reversal pair and copy the other

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48ab222
Revert "work out one color flow per reversal pair and copy the other"
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e965843
fold the color matrix only where the template sums over the pairs

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386a3ff
carry the folded color sum in the madevent templates, switched off

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d26858b

Commits on Aug 7, 2026

gather the folded color flows without opening a block

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10a1dad
sum |M|^2 with real arithmetic

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9fe3443
refresh the madevent references for the folded color sum

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ee8a18b
Revert "sum |M|^2 with real arithmetic"
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b7291d7
walk whole numbers when every coefficient shares its power of i

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58879ec
sum the color for every helicity at once, through BLAS

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990cd7f
leave the helicity guard alone when BLAS is off

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b33129e
drop the INIT_CF call that belongs to another session

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6be84b4
give madevent the common block its color matrix is rebuilt into

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2b26e0e
Merge branch 'claude/colour-reflection' into claude/gracious-moser-253876
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49aa8a3
put the stored IOTest references back

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c99a102
Merge branch 'claude/madevent-init-cf' into claude/gracious-moser-253876
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27b7d3a
regenerate the three stored comparison files
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f889950
sum the color of every helicity in one batched BLAS-3 call, for madevent

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7fd3a33
mg7: keep the flavors carried by processes mapped onto one matrix element

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7614a93
make a failed run fail as a failed run, not as a disagreement

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eca43df
build the (n-2)! Del Duca-Dixon-Maltoni basis for multi-gluon processes

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ab161ac
give standalone the same color flow work as madevent

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7487ad5
Merge branch 'claude/madevent-blas-colour-sum' into claude/dixon-maltoni-gluon-basis-69e1d7
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adeb002
give madmatrix the DDM color basis and the Kleiss-Kuijf color flows

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6f559c3
fold the madmatrix color sum onto one flow per reversal pair

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ed00d1a
give the madmatrix color flows the sub-expressions the fortran ones have

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4ca220c
fix the FPTYPE=f build of the madmatrix check_sa driver

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332bf68
send the C++ color sum through a host BLAS

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20446e4
Merge branch 'claude/competent-haslett-2092a6' into claude/madmatrix-cpu-blas
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449de54
Merge branch 'claude/madmatrix-cpu-blas' into claude/dixon-maltoni-gluon-basis-69e1d7
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e93f684
Merge branch 'claude/madmatrix-colour-fold' into claude/dixon-maltoni-gluon-basis-69e1d7
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4bb8e20
fold the cuBLAS color sum onto one flow per reversal pair

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4bdf039
Merge branch 'claude/madmatrix-jamp-cse' into claude/dixon-maltoni-gluon-basis-69e1d7
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ed9f672
Merge branch 'claude/cranky-franklin-bc7ec5' into claude/dixon-maltoni-gluon-basis-69e1d7
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1852bf7
share the orbit equivariant color-flow search with the madmatrix backend

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d718ce8

Commits on Aug 9, 2026

mg7: pick the color flow from a mask built on the color flow basis

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467862f
hel_recycle: never wrap a statement onto a blank physical line

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9f984d9

Commits on Aug 11, 2026

drop the batched BLAS-3 color sum from madevent

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b2b6d13
drop the batched BLAS-3 color sum from the fortran standalone

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bfc5a08