A scientist’s position within the ranking is determined by their D-index (Discipline H-index), a refined bibliometric indicator that only includes publications and citations related specifically to the evaluated discipline—in this case, Physics. This discipline-focused measure affords a more accurate reflection of a researcher’s impact and productivity within their specialty, avoiding distortions that may arise from work outside the discipline.
Scope of Research and Qualification Criteria
The ranking examined a total of 279,971 scientist profiles identified through a rigorous review of multiple bibliometric data sources spanning all academic disciplines. Specifically for Physics, 1,000 scientists were evaluated to derive the Saudi Arabia-specific ranking.
To qualify for inclusion, a scientist was required to have a D-index of at least 70 with a majority of their tier publications predominantly within the field of Physics. Besides bibliometric thresholds, peer recognition through awards and achievements related to Physics was also taken into consideration to further validate the contributions of the ranked scientists.
The D-index threshold is dynamically set as increments of 10, calibrated based on the estimated total number of scholars in each discipline. This tiered approach guarantees that the ranking includes the top 1% of leading scholars in Physics. Moreover, a proximity condition was applied whereby the difference between a scientist’s general H-index and their D-index must not exceed 30%, ensuring alignment between general research impact and discipline-specific influence.
Verification Practices
Recognizing that raw bibliometric data alone cannot serve as an absolute tool for evaluating the full scope of scholarly output, the Research.com team employed extensive manual verification. Each scientist profile was carefully cross-correlated against publications indexed in a broad array of authoritative and trustworthy sources to validate accuracy and integrity.
Although the number of papers published in renowned journals and conference proceedings does not directly affect a researcher’s ranking position, it constitutes an important secondary signal reflecting a scientist’s overall contribution to their field. The ranking ultimately relies on the rigorously calculated D-index based on data from OpenAlex and CrossRef, two of the most prominent and reliable bibliometric databases available to the scientific community.
For comprehensive details on the methodology used, we encourage readers to consult our methodology page.
Research.com’s Mission Behind the Ranking
The overarching mission of Research.com in producing this ranking is to motivate researchers, academic institutions, industry stakeholders, and policymakers worldwide to closely observe strategic trends and directions pursued by leading experts. Providing transparent, meticulously curated information about top scientists enables the global scientific community to identify and engage with foremost authorities in specific areas of study, across countries, and within prominent research institutions.
By delivering reliable, data-driven rankings at a national and disciplinary level, Research.com strives to foster collaboration, innovation, and informed decision-making among all actors invested in advancing scientific knowledge.
