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Calendar of Physics Talks Vienna
| Jets during the nonequilibrium QCD plasma in heavy-ion collisions: Broadening and gluon radiation |
| Speaker: | Florian Lindenbauer (MIT) |
| Abstract: | Relativistic heavy-ion collisions create a plasma of deconfined quarks
and gluons, which is initially far from equilibrium. While most studies
describe this plasma as a relativistic fluid, this approximation is not
valid at early times, where QCD kinetic theory can be used to model the
nonequilibrium plasma dynamics. In this talk, I will discuss how this
nonequilibrium plasma influences the propagation of energetic particles,
which are then measured as jets in the detectors. In particular, I will
discuss how their momentum broadening is modified in the presence of a
nonequilibrium and anisotropic QCD medium, and how the resulting emitted
gluon spectrum differs from equilibrium. These results establish a basis
for incorporating nonequilibrium dynamics into realistic descriptions of
jet quenching and the evolution of hard probes. |
| Date: | Thu, 08.01.2026 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | DA08E10, Green tower, 8th floor, TU Wien, Wiedner Hauptstrasse 8-10 |
| Contact: | Andreas Ipp, Ankit Aggarwal |
| Nonreciprocity in bosonic and fermionic Kitaev chains |
| Speaker: | Andreas Nunnenkamp (Universität Wien) |
| Abstract: | Directional amplification and nonreciprocity are emerging as central resources for signal processing, sensing, and quantum information processing. In my talk, I will first present an experimental realization of a bosonic analogue of the well-known fermionic Kitaev chain in a nano optomechanical network, where beamsplitter and two mode squeezing interactions replace hopping and pairing. We observe quadrature dependent chiral amplification with end to end gain that scales exponentially with system size, together with pronounced sensitivity to boundary conditions. By controlling interaction phases and amplitudes, we chart a dynamical phase diagram in which non Hermitian topological transitions, signaled by spectral winding, govern onset of directionality, amplification, and an exponentially enhanced response to weak perturbations. In the second part of the presentation, I will discuss a res |
| Date: | Fri, 09.01.2026 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Tim Langen |
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