Sven Harder
I work on strongly coupled systems and on deep learning for theoretical physics.
Ph.D. student in theoretical physics at UCLA
Los Angeles, California
Research
Papers & explainers
- 2026
A Superfluid at All Temperatures
Four-dimensional conformal field theories with finitely many fields whose thermal state breaks a continuous symmetry at every temperature. Weakly gauging the symmetry gives a superconductor over an exponential range of temperatures.
- 2026
Tilts from 2-Groups
Line defects charged under a 2-group symmetry generically break part of it, giving a family of defects protected by a "family anomaly", with tilt operators that probe how the defect responds to the broken symmetry.
Talks
Talks & lectures
Understanding Extended Magnetic Defects
What symmetries and anomalies imply for magnetic line defects in three- and four-dimensional gauge theories, and their renormalization-group flow in 3d gauge theories with many flavors.
Blog
Notes & short posts
Resisting Misalignment ↗
A superfluid at every temperature, and a chiral symmetry that stays broken however hot it gets: two quantum field theories where order survives even at infinite temperature.
Curriculum vitae
CV
Ph.D. in theoretical physics at UCLA (expected 2027), advised by Thomas Dumitrescu. Visiting researcher at SLAC since 2026. B.Sc. in physics from Universität Hamburg.
Download CV (PDF, 1 page)Contact
Get in touch
Questions about my research, visits and collaborations are welcome.
UCLA
Los Angeles, California