Report summary

The 2015-2026 picture for University of California, San Diego Department of Physics is a 100-PI network with 97 internal PI collaborations. The research center of gravity is Physics and Astronomy as the leading field (42% of slots across 73 PIs; 73 labels), Nuclear and High Energy Physics as the leading subfield (16% of slots across 37 PIs; 37 labels), and Particle physics theoretical and experimental studies as the leading topic (6% of slots across 17 PIs; 17 labels). This is a solid, readable collaboration map: group-level fit matters more than a single department-wide label. The top weighted PIs are J. E. Hirsch (58.2 weighted works; High-pressure geophysics and materials, Physics of Superconductivity and Magnetism). The strongest pairings are M. M. Fogler and D. N. Basov (21 shared works, weight 10.7). The standout breakdown groups are group 1 with 10 PIs, 9 internal connections, weight 23.5, around Nuclear and High Energy Physics, Atomic and Molecular Physics, and Optics, Condensed Matter Physics, led by Benjaḿın Grinstein, Yi‐Zhuang You, Bartosz Fornal.