Facts and Fictions about Anti deSitter Spacetimes with Local Qantum Matter
Bert Schroer (CBPF, Rio de Janeiro)

TL;DR
This paper explores the theoretical foundations of AdS/CFT correspondence using conformal compactification and algebraic QFT, highlighting differences from string theory and discussing holography related to light fronts and black-hole entropy.
Contribution
It provides a rigorous algebraic QFT perspective on AdS/CFT, clarifies differences with string theory conjectures, and introduces holography concepts linked to localization entropy.
Findings
Reveals subtle differences between string theory and algebraic QFT approaches.
Connects light-front holography with 't Hooft's ideas and black-hole entropy.
Provides a formal framework for understanding holography and localization entropy.
Abstract
It is natural to analyse the AdS-CQFT correspondence in the context of the conformal- compactification and covering formalism. In this way one obtains additional inside about Rehren's rigorous algebraic holography in connection with the degree of freedom issue which in turn allows to illustrates the subtle but important differences beween the original string theory-based Maldacena conjecture and Rehren's theorem in the setting of an intrinsic field-coordinatization-free formulation of algebraic QFT. I also discuss another more generic type of holography related to light fronts which seems to be closer to 't Hooft's original ideas on holography. This in turn is naturally connected with the generic concept of ``Localization Entropy'', a quantum pre-form of Bekenstein's classical black-hole surface entropy.
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