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Cornelius Rampf (Obs Nice)  Fri, 21. Feb 20, 15:00  
Singularities in cosmological VlasovPoisson and quantum picture  
The evolution of cold dark matter (CDM) is governed by the cosmological Vlasov–Poisson equations. As it is wellknown, the gravitational collapse of CDM leads to infinitedensity caustics that seed the primordial darkmatter halos in the cosmic largescale structure. Focusing on the onedimensional case, I report a landscape of so far unknown singularities in the particle acceleration that emerge after the first crossing of particle trajectories. These singular features may be regulated by assuming a finite temperature for dark matter, which, to some extend, simplifies the numerical computation but complicates the theoretical modelling. Alternatively, singular features are naturally tamed in semiclassical, Schrödingerlike descriptions for the largescale structure which I will discuss as well.  

Sebastian Erne (VCQ Wien)  Fri, 21. Feb 20, 14:30  
Analog simulators for early universe cosmology: from false vacuum decay to reheating  
Designing effective field theories in a laboratory setup has gained increasing attention over the last years and lies at the heart of analoggravity experiments. Probing the validity of these effective models constitutes an essential step towards (quantum) simulators of otherwise inaccessible systems. Focusing on its applications for early universe cosmological problems, I report on the opportunities, validation, and limitations of analog classical and quantum simulators for (Quantum) Field Theory in curved and timedependent spacetimes, in particular to cosmic inflation. As specific examples, I will discuss applications of single and multicomponent quantum fluids and classical twofluid systems in strong gradient magnetic fields.  

Robin Kaiser (INLPH Nice)  Fri, 21. Feb 20, 11:45  
Photon –Atom Interactions: from cold atoms to astrophysics  
Atomic physics experiments, based on hot vapors or lasercooled atomic samples, may be useful to simulate some astrophysical problems, where radiation pressure, radiative transport or light amplification are involved. I will present some ongoing experimental efforts in Nice and discuss spontaneous selforganisation with lightinduced longrange forces.  

Oliver Hahn (Obs Nice)  Fri, 21. Feb 20, 11:15  
Cosmological Structure Formation: Numerics and Theory, State of the Art and Open Problems  

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