Seminars

 

  • Tuesday 2 February 2021 at 10.15 with Zoom: Umut Gürsoy (Utrecht U.)
    Hydrodynamics and holography of spin currents
    Abstract:
    Collective motion of spin has been playing a prominently interesting role both in high energy and condensed matter physics, especially after the observation of global polarization of $\Lambda$ hyperons in heavy ion collisions and generation of spin current in liquid helium. In this talk I will explain how to construct the theory of spin hydrodynamics, that is, relativistic hydrodynamics comprised of the spin current and the stress tensor. We then apply this to heavy ions and find surprisingly good agreement with data. Finally, I will introduce a holographic approach to spin currents employing the Lovelock-Chern-Simons theory in five dimensions.

  • Tuesday 16 February 2021 at 10.15 with Zoom: Jukka Maalampi (Jyväskylä)
    The strange history of Runar Gåsström, a Finnish-American-Soviet Physicist
    Abstract:
    Runar Viktor Gåsström (1914-1998) was born to a Finnish immigrant family in New York. The family moved back to Finland in 1917, to immigrate ten years later to Vancouver, Canada, and further on to Petroskoi, Soviet-Karelia. Gåsström studied physics in the Moscow State University, allegedly as a student of Pjotr Kapitsa. In 1946 Gåsström, quite surprisingly, moved to Helsinki. He worked for ten years at the Department of Physics in the nuclear physics group of Lennart Simons, being e.g. responsible of the construction of a Van de Graaff generator. Gradually, some of his actions, such as his frequent and inquisitive visits in nuclear physics research centers around the Western Europe and his possible role in the defection of Italian nuclear physicist Bruno Pontecorvo to Soviet Union, as well as his background, started to raise concerns. Gåsström left Finland in 1954 and moved to Groningen, Netherlands, and then to Vienna to work for the IAEA. In 1960 he returned to Soviet Union, where he thereafter held many distiguished positions in Novosibirsk, Irkutsk, and Kaliningrad, working in the fields of nuclear electronics and radiophysics. 

 

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],
Sami Raatikainen (sami raatikainen at helsinki fi) [cosmo seminar]

New Nordic series of seminars over the web, link: https://sites.google.com/view/nordictheory/home 
For more information, and to subscribe to email announcements, contact Oscar Henriksson (oscar henriksson at helsinki fi)

Other related seminars

Friday 10-12 seminar series in A315:Astrophysics seminar.
Mathematical Physics Seminar and Workshop series Wed 14-16 in Exactum C123.