Recent discoveries of short period, radial-mode pulsations in stars which exhibit observational properties of hot subdwarfs have led to a multitude of suggested evolutionary states based on theoretical models. While spectroscopic studies which aim to estimate the atmospheric parameters and pulsation profiles of these objects are growing, they are still scarce. Presented here are photometric and spectroscopic results of a sample of these objects in order to begin to characterize their properties and constrain their evolutionary history.
Since the formation of atomic Bose-Einstein condensates (BEC) nearly 30 years ago, systems of cold atoms have developed into a versatile playground for the investigation into quantum many-body physics, with the promise to shed light onto dynamical processes in the spirit of quantum simulation efforts. With exquisite parameter control and a broad range of detection methods, a multitude of phenomena, ranging from superfluidity and quantum phase transitions to supersolidity and quantum transport, can be probed with high precision. I will give a broad introduction to the field of cold atoms and its techniques, highlighting a few of the milestone results of the past, and then turn to a selected set of recent experiments that address various dynamical quantum many-body processes such as dynamical localization, and the breaking thereof, and anyonization of bosons.
