2 papers
cs.CR2026
Coverage Is Not Containment: A Fundamental Limit of Admission-Time Defenses Against Coordinated Poisoning of Vector Retrieval
Prashant Kumar Pathak, Tarun Kumar Sharma
Retrieval-augmented generation (RAG) answers a question by retrieving passages from a vector store and trusting them as context, so anyone who can add documents can try to steer th…
cs.DB2026
Coverage Is Not Redundancy: Maintenance Cost and Exposure of Query-Aware Admission Indexes in Vector Databases Under Workload Drift
Prashant Kumar Pathak
In a vector database serving production-scale retrieval, a single inserted document can be retrieved for an anomalously large share of the query workload -- a retrieval hub -- and…