DEPARTMENT OF PHYSICS / HIP JOINT COLLOQUIA / SEMINARS 2025
- Thursday 20 February 2025 at 10:15 in A315 and using Zoom: Oleg Komoltsev (Stavanger)
QCD in the cores of neutron stars
Abstract:Rapid advancements in neutron-star (NS) observations allow unprecedented empirical access to cold, ultra-dense Quantum Chromodynamics (QCD) matter. The combination of these observations with theoretical calculations reveals previously inaccessible features of the equation of state and the phase diagram of QCD. In this talk, I demonstrate how perturbative-QCD calculations at asymptotically high baryon density provide robust constraints on the equation of state at neutron-star densities, based solely on causality and stability. By comparing the calculations to multimessenger neutron-star observations using a Bayesian framework, I show that QCD input softens the equation of state at neutron-star densities, supporting the hypothesis of a first-order phase transition or a crossover to quark matter cores in the most massive neutron stars. - Tuesday 25 February 2025 at 10:15 in A315 and using Zoom: Samuli Autti (Lancaster)
From a universe in a helium droplet to that droplet observing the Universe
Abstract: Superfluid 3He is perhaps the most versatile macroscopic quantum system in the laboratory. It has touching points with seemingly distant fields such as particle physics and cosmology and supports practical realisations of many exotic theoretical concepts. In this presentation, I discuss some striking phenomena recently discovered in this system, for example time crystals and their interactions and a superfluid that behaves as if it is two dimensional. Superfluid 3He is also increasingly being used to observe and model the behaviour of our Universe. I will show the first results from a dark matter detector using 3He as the collision target and explain how this sheds light on the yet-unresolved homogeneous nucleation problem with possible implications for a first-order phase transition in the early Universe. - Thursday 27 February 2025 at 10:15 in A315 and using Zoom: Adrita Chakraborty (Krakow)
TBA
Abstract: TBA - Tuesday 4 March 2025 at 10:15 in A315 and using Zoom: Michael Campbell (CERN)
Hybrid pixel detectors
Abstract: Hybrid pixel detectors were first developed for the LHC as they provide noise hit free imaging of particle collisions even at extremely high event rates. The same feature can be used to provide detection and imaging solutions in numerous other fields. The Medipix Collaborations, which are coordinated at CERN, have pioneered the spread of hybrid pixel detector technology to fields as far apart as space-based dosimetry, industrial X-ray analysis and inspection, homeland security, molecular biology, medical imaging and classroom experiments. This presentation will explain how hybrid pixel detectors work and cover how the Medipix and Timepix readout chips can provide unique imaging solutions to many different fields. The recent introduction of sub-ns timing at the pixel level combined with novel interconnect technologies permitting almost seamless coverage of large detection areas should further extend the reach of the technology. - Tuesday 6 May 2025 at 10:15 in A315 and using Zoom: Andreas Schmitt (Southampton)
TBA
Abstract: TBA - Tuesday 20 May 2025 at 10:15 in A315 and using Zoom: Helime Ruotsalainen (Helsinki)
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],
Jaakko Annala (jaakko annala 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 D114:Astrophysics seminar
Mathematical Physics Seminar and Workshop series Wed 14-16 in Exactum C123.
InstituteQ Events and Seminars