Valeurs et formes de la réalité dans l’art corporel français des années 1970

International audienceCet article est le fruit de la conférence tenue par Clélia Barbut lors de la rencontre internationale « Réalité(s), fiction, utopie dans l'art des années 1960 à 1989 en France, RFA, RDA et Pologne » [http://www.own-reality.org/fr/recherche/rencontres-internationales] organisée du 11 au 13 avril 2013 au Centre allemand d’histoire de l’art à Paris

Forms and Conceptions of Reality in French Body Art of the 1970s

International audienceThis article results from a conference held by Clélia Barbut within the scope of the international meeting “Reality(ies), Fiction and Utopia in the Art of France, West Germany, East Germany and Poland between 1960 and 1989” [http://www.own-reality.org/en/research/international-meeting] organised on 11, 12 and 13 April 2013 at the German Center of Art History in Paris. It was written in French and translated into English

Striped states in a many-body system of tilted dipoles

We study theoretically and experimentally the behaviour of a strongly confined dipolar Bose-Einstein condensate, in the regime of quantum-mechanical stabilization by beyond-mean-field effects. Theoretically, we demonstrate that self-organized striped ground states are predicted in the framework of the extended Gross-Pitaevskii theory. Experimentally, by tilting the magnetic dipoles we show that self-organized striped states can be generated, likely in their metastable state. Matter-wave interference experiments with multiple stripes show that there is no long-range off-diagonal order (global phase coherence). We outline a parameter range where global phase coherence could be established, thus paving the way towards the observation of supersolid states in this system.Comment: 9 pages, 7 figure

Critical Velocity and Dissipation of an ultracold Bose-Fermi Counterflow

We study the dynamics of counterflowing bosonic and fermionic lithium atoms. First, by tuning the interaction strength we measure the critical velocity vc of the system in the BEC-BCS crossover in the low temperature regime and we compare it to the recent prediction of Castin et al., Comptes Rendus Physique, 16, 241 (2015). Second, raising the temperature of the mixture slightly above the superfluid transitions reveals an unexpected phase-locking of the oscillations of the clouds. We interpret this observation as resulting from a Zeno-like effect induced by dissipation

Scissors mode of dipolar quantum droplets of dysprosium atoms

We report on the observation of the scissors mode of a single dipolar quantum droplet. The existence of this mode is due to the breaking of the rotational symmetry by the dipole-dipole interaction, which is fixed along an external homogeneous magnetic field. By modulating the orientation of this magnetic field, we introduce a new spectroscopic technique for studying dipolar quantum droplets. This provides a precise probe for interactions in the system allowing to extract a background scattering length for \textsuperscript{164}Dy of $69(4)\,a_0$. Our results establish an analogy between quantum droplets and atomic nuclei, where the existence of the scissors mode is also only due to internal interactions. They further open the possibility to explore physics beyond the available theoretical models for strongly-dipolar quantum gases