A researcher’s position in the ranking is determined by their D-index (Discipline H-index), a metric that specifically measures scholarly impact within a given discipline. Unlike a general H-index, the D-index considers only publications and citations relevant to the targeted discipline—in this case, Physics—thus providing a focused evaluation of scientific contributions within that field.
Scope of Research and Inclusion Criteria
For this edition, comprehensive profiles of 279,971 scientists across all disciplines were examined from a variety of bibliometric sources, including 91 researchers specializing in Physics based in Switzerland. To qualify for inclusion in the Physics ranking, each scientist was required to have a D-index of at least 70, ensuring a high threshold for demonstrated impact within the discipline. Furthermore, the majority of their tier publications had to be directly related to Physics, underscoring the importance of discipline-specific excellence.
In addition to bibliometric indicators, scientists' awards, honors, and notable achievements within the field of Physics were also taken into consideration, adding a qualitative dimension to the evaluation process. The selection threshold for the D-index is incrementally adjusted in steps of 10 based on the estimated total number of scholars in the discipline, guaranteeing that the top 1% of leading researchers are represented in the ranking. To maintain the integrity of discipline-specific impact measurement, a proximity of 30% or less between a scientist’s overall H-index and their D-index was required, ensuring focused scholarly contribution rather than broad, multidisciplinary activity.
Verification and Methodology
The Research.com team acknowledges that raw bibliometric data alone should not serve as an absolute measure of scientific contribution. Accordingly, all researcher profiles included in this ranking were manually verified and cross-correlated against publications indexed in a broad range of trustworthy and authoritative sources. While the number of publications in prominent journals and conference proceedings does not directly influence a researcher’s ranking position, it serves as a valuable secondary signal reflecting their active contribution to advancing research in Physics.
The primary positioning metric, the D-index, was calculated using publication and citation data obtained from OpenAlex and CrossRef—widely recognized as the most prominent bibliometric databases accessible to the scientific community today. For more detailed information on the methodology employed, please refer to our methodology page.
Research.com’s Mission and Vision
At Research.com, our mission is to motivate researchers, industry leaders, and policymakers worldwide to recognize emerging trends in scientific expertise. By providing a well-curated and transparent ranking of leading experts in specific areas of study—including countries and research institutions—we aim to foster connections within the global scientific community. This initiative not only highlights outstanding scholarly achievements but also supports informed decision-making in research investment, collaboration, and policy formulation.
We are committed to the meticulous, data-driven creation of rankings that inspire trust and credibility, ultimately contributing to the advancement of science and innovation worldwide.
