Publications (7)
Table-top Nonlinear Extreme Ultraviolet Spectroscopy
T. Helk, E. Berger, S. Jamnuch +12
The lack of available table-top extreme ultraviolet (XUV) sources with high enough fluxes and coherence properties have limited the availability of nonlinear XUV and x-ray spectros…
A note on the analyticity of AdS scalar exchange graphs in the crossed channel
L. Hoffmann, A. C. Petkou, W. Ruehl
We discuss the analytic properties of AdS scalar exchange graphs in the crossed channel. We show that the possible non-analytic terms drop out by virtue of non-trivial properties o…
Conformal partial wave analysis of AdS amplitudes for dilaton-axion four-point functions
L. Hoffmann, L. Mesref, W. Ruehl
Operator product expansions are applied to dilaton-axion four-point functions. In the expansions of the bilocal fields , and $\tildeΦ\tilde{…
Multi-trace quasi-primary fields of from AdS n-point functions
L. Hoffmann, L. Mesref, A. Meziane +1
We develop a recursive algorithm for the investigation of infinite sequences of quasi-primary fields obtained from chiral primary operators (CPOs) and eventually their d…
Composite fields, generalized hypergeometric functions and the symmetry in the AdS/CFT correspondence
L. Hoffmann, T. Leonhardt, L. Mesref +1
We discuss the concept of composite fields in flat CFT as well as in the context of AdS/CFT. Furthermore we show how to represent Green functions using generalized hypergeometric f…
AdS Box Graphs, Unitarity and Operator Product Expansions
L. Hoffmann, L. Mesref, W. Ruehl
We develop a method of singularity analysis for conformal graphs which, in particular, is applicable to the holographic image of AdS supergravity theory. It can be used to determin…
Aspects of the conformal operator product expansion in AdS/CFT correspondence
L. Hoffmann, A. C. Petkou, W. Ruehl
We present a detailed analysis of a scalar conformal four-point function obtained from AdS/CFT correspondence. We study the scalar exchange graphs in AdS and discuss their analytic…