Leiden University: #9 in the world for Physics & Astronomy collaboration

Leiden University stands at #9 of 1,195 universities worldwide on the Physics & Astronomy collaboration index, the strongest of its 26 subject standings in the 2026 Research Collaboration Index, published today.

The standing rests on the open scholarly record: 3,698 co-authored works in the field over 2021 to 2025, built with 664 collaborating institutions across 63 countries, with a field-weighted citation impact of 4.83.

Leiden University holds Gold standing overall, at #114 in the world.

The full index, all 26 subject rankings and complete methodology are now public.

Every figure derives from the open global research record and is checkable at source.