Multiscale impact of researcher mobility.

Area of Science:

• Physics
• Sociology of Science
• Bibliometrics

Background:

• International researcher mobility is a key driver of scientific, institutional, and cultural knowledge exchange.
• The impact of researcher mobility on scientific outcomes in the context of globalization and virtual communication technologies requires further investigation.

Purpose of the Study:

• To analyze the effect of international researcher mobility on citation impact, research topic diversity, collaboration networks, and geographical coordination.
• To identify causal effects of mobility on research outcomes using statistical matching methods.

Main Methods:

• Analysis of a large international dataset of 26,170 physicists from 1980-2009.
• Focus on a 10-year period around mobility events to assess impact.
• Application of statistical matching to compare mobile and non-mobile researchers with similar pre-mobility profiles.

Main Results:

• Mobile researchers experience up to a 17% increase in citations compared to non-mobile counterparts.
• This increase is associated with greater diversity in co-authors, research topics, and geographical coordination post-mobility.
• 11% of cross-border mobility events result in the complete cessation of collaborations with the source country.

Conclusions:

• International researcher mobility positively impacts individual scientific output and network diversity.
• Mobility-induced network changes can lead to significant restructuring of scientific collaborations and international integration.
• Findings have implications for immigration policies and national innovation systems, highlighting the complex interplay between human capital mobility and social capital investment.