New Penrose Limits and AdS/CFT
Gianluca Grignani, Troels Harmark, Andrea Marini, Marta Orselli

TL;DR
This paper introduces new Penrose limits of AdS_5 x S^5 and AdS_4 x CP^3 that reveal maximally supersymmetric pp-wave backgrounds with explicit space-like isometries, aiding the study of specific sectors in AdS/CFT.
Contribution
The paper presents novel Penrose limits with explicit space-like isometries, expanding the tools for analyzing particular sectors in AdS/CFT correspondence.
Findings
New Penrose limit of AdS_5 x S^5 with two space-like isometries
New Penrose limit of AdS_4 x CP^3
Facilitates study of SU(2|3) and SU(1,2|3) sectors in N=4 SYM
Abstract
We find a new Penrose limit of AdS_5 x S^5 giving the maximally supersymmetric pp-wave background with two explicit space-like isometries. This is an important missing piece in studying the AdS/CFT correspondence in certain subsectors. In particular whereas the Penrose limit giving one space-like isometry is useful for the SU(2) sector of N=4 SYM, this new Penrose limit is instead useful for studying the SU(2|3) and SU(1,2|3) sectors. In addition to the new Penrose limit of AdS_5 x S^5 we also find a new Penrose limit of AdS_4 x CP^3.
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