How great is the great orthogonality theorem?

1991 ◽  
Vol 68 (3) ◽  
pp. 200 ◽  
Author(s):  
Carlos Contreras-Ortega ◽  
Leonel Vera ◽  
Eduardo Quiroz-Reyes
Keyword(s):  
Orthogonality Theorem

scholarly journals Single particle operators and their correlators in free $$ \mathcal{N} $$ = 4 SYM

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
F. Aprile ◽  
J. M. Drummond ◽  
P. Heslop ◽  
H. Paul ◽  
F. Sanfilippo ◽  
...  
Keyword(s):  
Single Particle ◽  
Operator Product ◽  
Point Function ◽  
Superstring Theory ◽  
Yang Mills ◽  
Free Theory ◽  
Explicit Formulae ◽  
Orthogonality Theorem ◽  
Single Trace ◽  
Bps States

Abstract We consider a set of half-BPS operators in $$ \mathcal{N} $$ N = 4 super Yang-Mills theory which are appropriate for describing single-particle states of superstring theory on AdS5× S5. These single-particle operators are defined to have vanishing two-point functions with all multi-trace operators and therefore correspond to admixtures of single- and multi-traces. We find explicit formulae for all single-particle operators and for their two-point function normalisation. We show that single-particle U(N) operators belong to the SU(N) subspace, thus for length greater than one they are simply the SU(N) single-particle operators. Then, we point out that at large N, as the length of the operator increases, the single-particle operator naturally interpolates between the single-trace and the S3 giant graviton. At finite N, the multi-particle basis, obtained by taking products of the single-particle operators, gives a new basis for all half-BPS states, and this new basis naturally cuts off when the length of any of the single-particle operators exceeds the number of colours. From the two-point function orthogonality we prove a multipoint orthogonality theorem which implies vanishing of all near-extremal correlators. We then compute all maximally and next-to-maximally extremal free correlators, and we discuss features of the correlators when the extremality is lowered. Finally, we describe a half-BPS projection of the operator product expansion on the multi-particle basis which provides an alternative construction of four- and higher-point functions in the free theory.

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