This report synthesises findings from 6 peer-reviewed papers addressing the following research question: How robust are QNorm and DNorm distance metrics to domain shifts in retrieval tasks when evaluated on a diverse set of LLM-based encoders (e.g., BERT, RoBERTa, T5) across BEIR benchmarks. 8 claims were extracted from source literature; 8 were independently verified against retrieved documents. An automated multi-reviewer quality assessment produced a score of 9.0/10. This report is a machine-generated literature synthesis and does not constitute original research.Research goal: How robust are QNorm and DNorm distance metrics to domain shifts in retrieval tasks when evaluated on a diverse set of LLM-based encoders (e.g., BERT, RoBERTa, T5) across BEIR benchmarks?Autonomous literature synthesis. Automated review score: 9.0/10. Full text and citation available at Assignee Research.