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Calendar of Physics Talks Vienna
| Superconducting baryon crystal at strong magnetic field (Vienna Theory Lunch Seminar) |
| Speaker: | Andreas Schmitt (University of Southhampton) |
| Abstract: |
Strongly interacting matter in extreme magnetic fields occurs in heavy-ion collisions and neutron stars and is of theoretical interest for the phase structure of Quantum Chromodynamics. It was previously found that a so-called Chiral Soliton Lattice is formed at sufficiently large magnetic fields and baryon chemical potentials. Using chiral perturbation theory and methods from ordinary type-II superconductivity I will discuss the instability of the Chiral Soliton Lattice and the resulting transition to a 3D crystalline structure. This structure is an inhomogeneous condensate of neutral and charged pions and thus a superconductor with spatially modulated magnetic field and, due to the axial anomaly, spatially modulated baryon number. I will also speculate what this new phase implies for the QCD phase structure.
[[Vienna Theory Lunch Seminar, https://lunch-seminar.univie.ac.at ]] |
| Date: | Tue, 09.04.2024 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | University of Vienna: Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Dark matter, bound states and unitarity |
| Speaker: | Kallia Petraki (Sorbonne) |
| Abstract: | If dark matter couples to force mediators that are much lighter than itself, then its interactions manifest as long-ranged. This gives rise to non-perturbative effects, including the existence of bound states. The formation of stable or metastable dark matter bound states can affect the dark matter phenomenology very significantly, including the dark matter relic density and indirect detection signals, as well as the dark-matter self-scattering inside galaxies. I will give an overview of these effects in the context of dark matter production in the early universe, emphasising the important role of the Higgs, as well as the connection to unitarity. |
| Date: | Tue, 09.04.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Boltzmanngasse 5, 5. Stock |
| Contact: | J. Pradler |
| Weighing spacetime along the line of sight using times of arrival of electromagnetic signals |
| Speaker: | Mikolaj Korzynski (Polish Academy of Sciences) |
| Abstract: | I will present a method of determining the mass density along the line of sight using variations of times of arrival of electromagnetic signals, as measured by two ensembles of free falling, precise clocks. The whole set-up may be considered a type of an extended gravitational compass, i.e. a device measuring directly the spacetime curvature using an ensemble of communicating clocks. I will also discuss the geometric interpretation of this measurement. |
| Date: | Wed, 10.04.2024 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Seminarraum A, Waehringer Strasse 17, 2nd Floor |
| Contact: | P. Chrusciel |
| Quantum computing with the quantised harmonic oscillator |
| Speaker: | Giulia Ferrini (Chalmers University Göteborg) |
| Abstract: | Beyond the use of two-level systems for encoding quantum bits (or âqubitsâ) of information, the infinite many levels of bosonic fields, modelled by quantised harmonic oscillators, can also be exploited for information encoding. This paradigm offers enhanced resilience to errors through the use of bosonic codes, and the possibility to generate deterministically large entangled states. I will review theoretical progresses on the applications of bosonic systems to quantum computing, as well as on the understanding of the resourcefulness of quantum states in bosonic architectures. |
| Date: | Fri, 12.04.2024 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Eliza Agudelo Ospina |
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