DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS 2025

• • Tuesday 18 November 2025 at 10:15 in A315 and using Zoom : Xin Li (Helsinki)
    Splitting of doubly and quadruply quantized vortices in holographic superfluids
    Abstract: We investigate the splitting of vortices in holographic superfluids at finite temperatures, focusing on doubly and quadruply quantized vortices (with winding numbers 2 and 4). For doubly quantized vortices, we find that the growth rate of linear instabilities closely matches the characteristic time scale of the nonlinear splitting process, confirming the consistency between the two analyses. For quadruply quantized vortices, we analyze their linear stability and identify five unstable modes. As the temperature increases, three of them successively become the dominant mode, signaling two dynamical phase transitions and giving rise to three distinct splitting patterns. Two of these patterns have been observed experimentally, while the one at higher temperatures remains unreported, offering new theoretical guidance for future experiments.
  • Tuesday 25 November 2025 at 10:15 in A315 and using Zoom : Mikael Myllymäki (Helsinki)
    TBA
    Abstract: TBA
  • Tuesday 4 December 2025 at 10:15 in A315 and using Zoom : René Meyer (Würzburg)
    TBA
    Abstract: TBA
  • Tuesday 9 December 2025 at 10:15 in A315 and using Zoom : Tuomas Lappi (Jyväskylä)
    TBA
    Abstract: TBA

Hopefully the up to 50 min + 10 min discussion long seminar/colloquium will be understandable to a wide audience.
Contacts: Keijo Kajantie (keijo kajantie at helsinki fi) [ HIP seminar],
Tushar Gupta  (tushar.gupta at helsinki fi) [cosmo seminar]

Other related seminars

Friday 10-12 seminar series in D114:Astrophysics seminar
Mathematical Physics Seminar and Workshop series Wed 14-16 in Exactum C123.
InstituteQ Events and Seminars