250 P. ran Nieuwenhuizen, SupergravitvThe gauge commutator for open algebras has the formR, k (\a$ i k — i fy + ~ I)a.k $ \ 1 /3k a — yJ ‘40 ~ ,f~!a13where I~’= 61”/64r’ with JCI the classical action, and we always consider in this section right-derivatives.In the variation of the usual quantum action of subsection 2, it is only at the last step that not all termscancel, but one is left with6I(quantum) = C*aF,,.~(~I~/i,~,.CvA )C’3. (2)As we discussed in the section on matter coupling, such terms proportional to I’~can always be canceledby adding an extra term to 64,. After bringing I’/ to the left, one finds64,’ (extra) = _~C*aFa.j7~yCYAC’3 ()(J+1)i (3)This new variation of 4,’ leads to extra terms in 61 (quantum). Keeping the same gauge fixing term,we find for the ghost action by variation of the gauge fixing terms and sandwiching the result with ghostsand antighosts the following resultJ = JCI~~p 7~’3J3~+ C*aF,, 1R10C’3 ~ (4)The new four-ghost coupling is due to 84,’ (extra) and one has a factor —1/4 rather than —1/2 since bothantighosts appear symmetrically due to symmetry properties of ‘q’ which we now discuss.From the gauge commutator it follows that 64, = I’~]i~-q’3~” is again a local gauge invariance of theaction. HenceJciJd~i~~$~a = 0. (5)This means that the nonclosure function ~~ is a sum of terms either with the symmetry~q_()ij+l~ji (6)(where i = 1for fermionic fields and i = 0 for bosonic fields), or with &~‘a gauge transformation itself,which then of course <strong>van</strong>ishes on-shell,= R1A(X)~~IcJ) (7)where XAI is some matrix which follows from (5). In supergravity we calculated the nonclosure function~ in subsection 1.9 and found that it is nonzero for i, j, a, /3 all supersymmetry indices, since only thecommutator of two local supersymmetry transformations on a gravitino gave a field equation, namelythe field equation of the gravitino. Thus for the tetrad 64,’ = 0, from which we conclude that XAJ in (7)<strong>van</strong>ishes. Hence the nonclosure function has the symmetries in (6), and this justifies the factor —1/4 in(4). This symmetry follows also directly from eqs. (12, 13) of subsection 1.9 if one replaces R” by_C_tR~~,Tand uses that y,,C’ is symmetric but y5y,,C~antisymmetric. In general one has to add the
P. <strong>van</strong> Nieuwenhuizen, Supergravily 251local symmetries Ô4,’ to the total set of gauge invariances in theories with open gauge algebras when64,’ is nonzero.It should be stressed that these new four-ghost couplings in (4) can no longer be written as aFaddeev—Popov determinant and hence that the usual Slavnov—Taylor method for deducing Wardidentities is not applicable here. Instead one should use BRST invariance, as we shall do.We must now use the new 4, variation in the old two-ghost action, and the new and old 4, variationas well as the ghost variation in the new four-ghost action. From now one we specialize to supergravitywhere ~~ depends only on tetrads and the indices i, j, a, /3 refer to gravitinos and supersymmetryparameters. In this case the new 4, variation does not contribute in the new ghost action sinceand since F,,, and F 0~,.in (4) do not depend on the gravitino field. (We exclude gauge choices F,.quadratic in 4’ from consideration. This is not necessary, but covers all useful cases.) For the remainingthree variations one findsC*~F,,,1Ri0,,( ~ ~C”/1 ~Y’)C’3— ~C*~FajC*’3F’3,kfl ~/~,(RIACAA )C’ tC~’_~C*aF,,,jC*$F$,kn~(_ ~r~C~AC”)C”. (9)Since C” in the first term is commuting, we symmetrize the first term in both antighosts and find6I(quantum)= _~C*AFA.IC*TFT,,F~4$aC~AC’3C’ (10)where the expression for P ‘~~$alooks very much like a commutator of an ordinary gauge transformation64,1 R’,, with a transformation 64i’ ~ ~ sinceF” — fly$,k ii k a j Iy,k77$a kl + Iy,kTI$a ki — 77y~j U $a.11Since the transformation 64, -~ ~ looks like one of the terms one finds in the commutator of twogauge transformation, one is led to consider the Jacobi identities for three consecutive gauge transformations.Consider the Jacobi identity6(~)[6(~), ô(~)]— [6(q), 6(~)]8(C)+ cyclic in ~ =0. (12)Substituting (1), and substituting in the result once more the identity (1), one findsRiAAA,,$~Y?~~ + I’~B”+ cyclic in ~ = 0 (13)where A and B are defined byAA __;A ;8 itA flk~ a$y — I ~äJ $y ~J a$.k~ yB” = —n ~f8,,0~1’3r~”+ 77 ,,$.kRk~,~77$~a— R ‘y.k(”77 ~ n’3r(~)“+Rç,,,77 Ic! ‘i~rc”()’~’ ±y) (15)(8)
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In memoriam Joel ScherkJoel Scherk
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